archive: result migration

conductor/archive/result_migration_20260616/metadata.json

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+{
+  "track_id": "result_migration_20260616",
+  "name": "Result Migration (Phase 2 - eliminate all bad exception handling)",
+  "initialized": "2026-06-16",
+  "completed_at": "2026-06-16 (umbrella planned; sub-tracks execute over time)",
+  "owner": "tier2-tech-lead",
+  "priority": "A",
+  "status": "active",
+  "type": "refactor (5 sub-tracks; each a separate TDD execution)",
+  "scope": {
+    "new_files": [
+      "conductor/tracks/result_migration_20260616/spec.md",
+      "conductor/tracks/result_migration_20260616/plan.md",
+      "conductor/tracks/result_migration_20260616/metadata.json"
+    ],
+    "sub_tracks_planned": [
+      "result_migration_review_pass_<YYYYMMDD>",
+      "result_migration_small_files_<YYYYMMDD>",
+      "result_migration_app_controller_<YYYYMMDD>",
+      "result_migration_gui_2_<YYYYMMDD>",
+      "result_migration_baseline_cleanup_<YYYYMMDD>"
+    ],
+    "modified_files": [],
+    "deleted_files": []
+  },
+  "blocked_by": [
+    "exception_handling_audit_20260616 (shipped 2026-06-16; produced the 268-site inventory)"
+  ],
+  "blocks": [
+    "data_structure_strengthening_20260606 (parallel; uses the cleaner Result API from this phase)",
+    "user_stated_intent: send_result -> send mass rename (user manual refactor; post-this-phase)"
+  ],
+  "estimated_phases": 5,
+  "spec": "spec.md",
+  "plan": "plan.md",
+
+  "sub_tracks": [
+    {
+      "id": "1: result_migration_review_pass",
+      "scope": "32 UNCLEAR + 25 INTERNAL_RETHROW = 57 sites across 15 files",
+      "tshirt_size": "S",
+      "why_first": "The UNCLEAR sites are ambiguous; human review + audit script heuristic updates feed into all later sub-tracks",
+      "files": "All 15 files with UNCLEAR or INTERNAL_RETHROW sites"
+    },
+    {
+      "id": "2: result_migration_small_files",
+      "scope": "37 files (35 SMALL + 2 MEDIUM); 72 V+S sites",
+      "tshirt_size": "L",
+      "why_second": "Quick wins; doesn't depend on the orchestrator or GUI; can run in parallel with sub-tracks 3-4",
+      "files": "api_hooks.py, project_manager.py, aggregate.py, multi_agent_conductor.py, summary_cache.py, commands.py, external_editor.py, models.py, outline_tool.py, file_cache.py, gemini_cli_adapter.py, log_registry.py, markdown_helper.py, orchestrator_pm.py, presets.py, shell_runner.py, command_palette.py, context_presets.py, diff_viewer.py, hot_reloader.py, startup_profiler.py, summarize.py, theme_2.py, tool_presets.py, workspace_manager.py, theme_models.py, paths.py, rag_data_models.py, performance_monitor.py, plus 6 more, plus session_logger.py, warmup.py"
+    },
+    {
+      "id": "3: result_migration_app_controller",
+      "scope": "src/app_controller.py (166KB); 56 sites (35 V + 3 S + 2 ? + 16 C)",
+      "tshirt_size": "XL",
+      "why_dedicated": "The orchestrator touches every subsystem; high coordination with Hook API + MMA + RAG",
+      "files": "src/app_controller.py"
+    },
+    {
+      "id": "4: result_migration_gui_2",
+      "scope": "src/gui_2.py (260KB); 54 sites (37 V + 2 S + 13 ? + 2 C)",
+      "tshirt_size": "XL",
+      "why_dedicated": "Largest file in the codebase; immediate-mode UI; depends on sub-track 3 for clean API",
+      "files": "src/gui_2.py"
+    },
+    {
+      "id": "5: result_migration_baseline_cleanup",
+      "scope": "3 refactored files; 112 sites (77 V + 10 S + 6 ? + 19 C)",
+      "tshirt_size": "L",
+      "why_last": "The baseline files ARE the convention reference; the remaining 77 violations are gaps to close (parent's Path C deferred work)",
+      "files": "src/mcp_client.py, src/ai_client.py, src/rag_engine.py"
+    }
+  ],
+
+  "regressions_and_pre_existing_failures": [],
+  "pre_existing_failures_fixed_by_this_track": [],
+  "pre_existing_failures_remaining": [],
+  "incidental_fixes_from_parent_track": [],
+  "deferred_to_followup_tracks": [
+    {
+      "id": "send_result_to_send_rename",
+      "title": "send_result -> send Mass Rename (user's stated intent)",
+      "description": "The user has stated intent to do a mass rename of send_result to send. The rename is mechanical (Result[T] return type is stable; only the function name changes). The user will do this manually after this phase ships.",
+      "track_status": "user_manual_refactor"
+    },
+    {
+      "id": "data_structure_strengthening_20260606",
+      "title": "Data Structure Strengthening (Type Aliases + NamedTuples)",
+      "description": "Introduce 6 TypeAlias definitions in src/type_aliases.py; replace 370+ anonymous dict[str, Any] sites in 6 high-traffic files. Spec already exists; plan pending. Blocked by this phase (cleaner Result API usage makes type-alias replacement easier).",
+      "track_status": "ready to start; blocked by this phase"
+    },
+    {
+      "id": "live_gui_mock_injection_20260615",
+      "title": "Live GUI Mock Injection Infrastructure",
+      "description": "Infrastructure for mock injection into the live_gui subprocess. Unblocks proper end-to-end live_gui + AI client tests.",
+      "track_status": "recommended; not yet specced"
+    },
+    {
+      "id": "audit_optional_in_3_files_track",
+      "title": "Wire 4 audit scripts into CI as --strict gates",
+      "description": "After this phase ships, scripts/audit_exception_handling.py --strict returns 0. Wire the 4 enforcement audit scripts (audit_weak_types, audit_optional_in_3_files [referenced by error_handling.md but not yet committed], audit_main_thread_imports, audit_exception_handling) into CI as --strict gates.",
+      "track_status": "recommended; not yet specced"
+    }
+  ],
+
+  "verification_criteria": {
+    "g1_review_pass_complete": "32 UNCLEAR sites reviewed; per-site decision (compliant-or-migration) recorded",
+    "g2_rethrow_pass_complete": "25 INTERNAL_RETHROW sites classified; per-site decision (one of 3 patterns or migration) recorded",
+    "g3_audit_heuristics_updated": "scripts/audit_exception_handling.py updated with heuristics for the most common compliant patterns",
+    "g4_updated_audit_runs": "Re-running the audit with the updated heuristics shows the UNCLEAR count is ~0",
+    "g5_per_subtrack_scope_updated": "The umbrella spec's per-sub-track plan is updated to reflect the post-review scope",
+    "g6_review_pass_report_exists": "docs/reports/RESULT_MIGRATION_REVIEW_PASS_<YYYYMMDD>.md exists with the per-site decision table",
+    "g7_no_test_regressions": "Full test suite: 1288 + 4 + 0 (unchanged; the review pass is informational)",
+    "g8_atomic_commits_per_subtrack": "Each sub-track is committed in 5+ atomic commits (spec, plan, metadata, code, docs)",
+    "g9_per_commit_git_notes": "All commits have git notes",
+    "nf1_no_production_code_change_in_review_pass": "Sub-track 1 (review pass) is informational; no production code change",
+    "nf2_atomic_commits": "Per-task atomic commits across the 5 sub-tracks",
+    "nf3_per_commit_git_notes": "All commits have git notes summarizing the work"
+  },
+
+  "estimated_effort": {
+    "method": "Scope + T-shirt size (per conductor/workflow.md §Tier 1 Track Initialization Rules). NO day estimates. The user / Tier 2 agent decides the actual pacing.",
+    "sub_track_1_review_pass": { "scope": "57 sites across 15 files", "tshirt_size": "S" },
+    "sub_track_2_small_files": { "scope": "72 V+S sites across 37 files", "tshirt_size": "L" },
+    "sub_track_3_app_controller": { "scope": "56 sites in 1 file (166KB)", "tshirt_size": "XL" },
+    "sub_track_4_gui_2": { "scope": "54 sites in 1 file (260KB)", "tshirt_size": "XL" },
+    "sub_track_5_baseline_cleanup": { "scope": "112 sites across 3 files", "tshirt_size": "L" },
+    "total": "5 sub-tracks, 268 sites across 42 files"
+  },
+
+  "risk_register": {
+    "R1_takes_longer_than_expected": {
+      "likelihood": "medium",
+      "impact": "high",
+      "mitigation": "Track 5 (baseline cleanup) is the biggest risk; the 30+ tool functions in mcp_client.py may be bigger than expected. The plan acknowledges scope can grow; the user decides whether to split sub-tracks further."
+    },
+    "R2_hot_reload_breaks": {
+      "likelihood": "medium",
+      "impact": "high",
+      "mitigation": "Sub-track 4 uses the hot-reload mechanism for visual verification. The migration is done incrementally; the user verifies each change visually."
+    },
+    "R3_hook_api_breaks": {
+      "likelihood": "low",
+      "impact": "high",
+      "mitigation": "Sub-track 3 includes before/after verification of the Hook API (via live_gui tests). The convention's Result type is structurally compatible with the existing str/None return types if needed."
+    },
+    "R4_review_pass_grows_scope": {
+      "likelihood": "medium",
+      "impact": "medium",
+      "mitigation": "The review pass updates the audit's heuristics; the migration scope for sub-tracks 2-4 may grow. The plan documents the scope changes in Phase 5."
+    },
+    "R5_user_reorders_subtracks": {
+      "likelihood": "low",
+      "impact": "low",
+      "mitigation": "The plan recommends a sequence but the user can reorder. The sub-tracks are independent enough to swap."
+    }
+  },
+
+  "milestone_context": {
+    "pre_track_state": "First fully green baseline (1288 + 4 + 0). The convention is applied to 3 of 65 src/ files (mcp_client, ai_client, rag_engine). 211 violations + 25 suspicious + 32 unclear = 268 'bad' sites across 42 files, per the exception_handling_audit_20260616 report.",
+    "post_track_target": "All 268 sites migrated. The convention is applied to all 65 src/ files. The 4 enforcement audit scripts can be wired into CI as --strict gates. Test pass count: 1288 + 4 + 0 (unchanged; the migration is behavior-preserving).",
+    "historical_context": "This is the migration phase that completes the data_oriented_error_handling_20260606 track (shipped 2026-06-12). The parent track established the convention; this phase applies it to the remaining 62 src/ files and closes the gaps in the 3 refactored files.",
+    "user_intent_after_this_track": "User decides: send_result -> send mass rename (manual) or data_structure_strengthening_20260606 (parallel track; uses the cleaner Result API from this phase)."
+  }
+}

conductor/archive/result_migration_20260616/plan.md

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+# Plan: Result Migration — Sub-Track 1 (Review Pass)
+
+**Sub-track:** `result_migration_review_pass_20260616` (first of 5 sub-tracks)
+**Umbrella:** `result_migration_20260616`
+**Date:** 2026-06-16
+**Owner:** Tier 2 Tech Lead
+**Base commit:** `4521a7df` (feat(scripts): add --summary and --by-size modes)
+
+---
+
+## Phase 1: Setup
+
+- [x] **Task 1.1: Create sub-track folder**
+  - WHERE: `conductor/tracks/result_migration_review_pass_20260616/`
+  - WHAT: spec.md, plan.md, metadata.json
+  - HOW: Copy the umbrella spec as the starting point; customize for
+    the review pass scope
+  - COMMIT: `conductor(track): spec for result_migration_review_pass (sub-track 1 of 5)`
+  - GIT NOTE: Summary of sub-track 1 scope + dependency on the umbrella
+
+- [x] **Task 1.2: Update `conductor/tracks.md`**
+  - WHERE: `conductor/tracks.md` (after the umbrella row 6c)
+  - WHAT: Add a row for the sub-track
+  - HOW: Same pattern as the umbrella
+  - COMMIT: `conductor: register result_migration_review_pass in tracks.md`
+  - GIT NOTE: 1-sentence note
+
+---
+
+## Phase 2: Review the 32 UNCLEAR sites
+
+For each UNCLEAR site, a human (the Tier 2 implementer with a human
+review from the user on disputed cases) reads the snippet + 2-3 lines
+of context and decides:
+- **Compliant** (it's a boundary the script doesn't recognize; document
+  the pattern; add a heuristic to the script)
+- **Migration-target** (it should be converted to Result-based; record
+  the line + file + decision in the report)
+
+The 32 UNCLEAR sites are in (per the audit):
+- `src/gui_2.py`: 13 sites
+- `src/mcp_client.py`: 4 sites (baseline)
+- `src/ai_client.py`: 2 sites (baseline)
+- `src/app_controller.py`: 2 sites
+- `src/models.py`: 2 sites
+- `src/outline_tool.py`, `src/summarize.py`, `src/shell_runner.py`,
+  `src/log_registry.py`, `src/summary_cache.py` (other small files):
+  ~9 sites total
+
+- [x] **Task 2.1: Review `src/gui_2.py` UNCLEAR sites (13)**
+  - WHERE: `src/gui_2.py`
+  - WHAT: For each of the 13 sites, decide compliant-or-migration
+  - HOW: Read the snippet; check the context; classify
+
+- [x] **Task 2.2: Review `src/mcp_client.py` UNCLEAR sites (4, baseline)**
+  - WHERE: `src/mcp_client.py`
+  - WHAT: Same as 2.1
+
+- [x] **Task 2.3: Review `src/ai_client.py` UNCLEAR sites (2, baseline)**
+  - WHERE: `src/ai_client.py`
+  - WHAT: Same as 2.1
+
+- [x] **Task 2.4: Review `src/app_controller.py` UNCLEAR sites (2)**
+  - WHERE: `src/app_controller.py`
+  - WHAT: Same as 2.1
+
+- [x] **Task 2.5: Review the 11 small-file UNCLEAR sites**
+  - WHERE: 11 small files
+  - WHAT: Same as 2.1
+
+---
+
+## Phase 3: Classify the 25 INTERNAL_RETHROW sites
+
+For each INTERNAL_RETHROW site, classify as one of:
+- **PATTERN 1 (catch + convert + raise as different type)**: legitimate
+- **PATTERN 2 (catch + log + re-raise)**: legitimate
+- **PATTERN 3 (catch + cleanup + re-raise)**: legitimate
+- **SUSPICIOUS (catch + re-raise the same exception)**: migration-target
+  (remove the try/except or convert to Result-based)
+
+The 25 INTERNAL_RETHROW sites are in:
+- `src/ai_client.py`: 6 sites (baseline)
+- `src/rag_engine.py`: 4 sites (baseline)
+- `src/app_controller.py`: 3 sites
+- `src/gui_2.py`: 2 sites
+- `src/warmup.py`, `src/api_hooks.py`, `src/models.py`,
+  `src/outline_tool.py`, `src/shell_runner.py`, `src/gemini_cli_adapter.py`,
+  `src/theme_models.py`: ~10 sites total
+
+- [x] **Task 3.1: Review `src/ai_client.py` INTERNAL_RETHROW sites (6)**
+  - WHERE: `src/ai_client.py`
+  - WHAT: Apply the 4 classifications
+  - HOW: Read the snippet; match against the patterns
+
+- [x] **Task 3.2: Review `src/rag_engine.py` INTERNAL_RETHROW sites (4)**
+  - WHERE: `src/rag_engine.py`
+  - WHAT: Same as 3.1
+
+- [x] **Task 3.3: Review `src/app_controller.py` INTERNAL_RETHROW sites (3)**
+  - WHERE: `src/app_controller.py`
+  - WHAT: Same as 3.1
+
+- [x] **Task 3.4: Review the 12 small-file INTERNAL_RETHROW sites**
+  - WHERE: 12 small files
+  - WHAT: Same as 3.1
+
+---
+
+## Phase 4: Update the audit script's heuristics
+
+For each site that turned out to be compliant (a common pattern the
+script doesn't recognize), add a heuristic to the classification logic.
+
+- [x] **Task 4.1: Add heuristics for the 5-10 most common compliant patterns**
+  - WHERE: `scripts/audit_exception_handling.py`
+  - WHAT: Add new classification logic for the patterns the review pass
+    found to be compliant
+  - HOW: Update `_classify_except` and `_classify_raise`; add new
+    constants if needed
+  - SAFETY: The script is a static analyzer; the changes don't affect
+    runtime behavior
+
+- [x] **Task 4.2: Verify the updated classification**
+  - WHERE: `scripts/audit_exception_handling.py`
+  - WHAT: Re-run the audit; the UNCLEAR count should drop to 0 (or
+    close to it); the INTERNAL_RETHROW count should drop to whatever
+    the 3 legitimate patterns don't cover
+  - HOW: `uv run python scripts/audit_exception_handling.py --by-size`
+
+---
+
+## Phase 5: Report
+
+- [x] **Task 5.1: Write the review pass report**
+  - WHERE: `docs/reports/RESULT_MIGRATION_REVIEW_PASS_<YYYYMMDD>.md`
+  - WHAT: Per-site decision table; updated migration scope for the
+    later sub-tracks; updated audit script heuristics; per-sub-track
+    site-count adjustments
+  - HOW: Use the format of the `EXCEPTION_HANDLING_AUDIT_20260616.md`
+    report
+  - COMMIT: `docs(report): add result_migration_review_pass report`
+  - GIT NOTE: Summary of the review pass + updated migration scope
+
+- [x] **Task 5.2: Update the umbrella spec's per-sub-track plan**
+  - WHERE: `conductor/tracks/result_migration_20260616/spec.md` (the
+    per-sub-track plan section)
+  - WHAT: Reflect the updated migration scope (some UNCLEAR sites may
+    be compliant; the site count per sub-track changes)
+  - HOW: Edit the spec; commit as a docs update
+  - COMMIT: `docs(track): update result_migration_20260616 with post-review scope`
+  - GIT NOTE: 1-sentence note about the scope change
+
+---
+
+## Phase 6: Verification
+
+- [x] **Task 6.1: Verify the updated audit script**
+  - WHERE: `scripts/audit_exception_handling.py`
+  - WHAT: Re-run with `--by-size`; verify the UNCLEAR count is now
+    ~0; verify the per-bucket totals reflect the updated scope
+  - HOW: `uv run python scripts/audit_exception_handling.py --by-size`
+
+- [x] **Task 6.2: Verify the test pass count is unchanged**
+  - WHERE: `tests/`
+  - WHAT: This sub-track is informational; the test pass count should
+    stay at 1288 + 4 + 0
+  - HOW: `uv run pytest tests/ --timeout=120 -p no:cacheprovider -q` (this
+    takes a while; consider running the batched version instead)
+
+- [x] **Task 6.3: Mark the sub-track as completed**
+  - WHERE: `conductor/tracks/result_migration_review_pass_<YYYYMMDD>/metadata.json`, `conductor/tracks.md`
+  - WHAT: Update `status: active → completed`; `completed_at: 2026-06-16`
+  - HOW: Edit the files; commit
+  - COMMIT: `conductor(track): mark result_migration_review_pass as completed`
+  - GIT NOTE: 1-sentence note
+
+---
+
+## Notes for the Tier 2 Implementer
+
+- **This is a research task, not a refactor.** No production code
+  changes (only the audit script and the docs). The Tier 2 implementer's
+  job is to look at each of the 57 sites and make a decision.
+- **The decisions feed into the migration scope** of sub-tracks 2-4.
+  Some sites that are UNCLEAR now may turn out to be compliant (the
+  script's heuristics are imperfect). Some INTERNAL_RETHROW sites may
+  turn out to be one of the 3 legitimate re-raise patterns.
+- **The audit script updates are optional but encouraged.** If a
+  pattern turns out to be commonly compliant, add a heuristic. This
+  helps future audits.
+- **The user is the final arbiter** on disputed cases. If a site's
+  classification is unclear after human review, ask the user.
+- **The review pass is bounded by site count, not time.** 57 sites to
+  review; the audit script updates + report writing follow. The
+  Tier 2 implementer should not block on review for disputed cases.
+## Risks at the Plan Level
+
+| Risk | Mitigation |
+|---|---|
+| The review pass reveals more UNCLEAR sites than expected (the heuristics miss patterns) | The plan includes a "Task 4.2: Verify the updated classification" step; the user re-runs the audit and confirms the UNCLEAR count is ~0 |
+| The user disagrees with a classification on a disputed case | The plan asks the user for input on disputed cases; the user is the final arbiter |
+| The user disagrees with a classification | The plan asks the user for input on disputed cases; the user is the final arbiter |
+| The audit script updates introduce regressions | Run the updated audit after each heuristic change; compare before/after counts |
+| The post-review scope changes invalidate the umbrella spec's per-sub-track plan | The plan includes a Task 5.2 to update the umbrella spec with the new scope |

conductor/archive/result_migration_20260616/spec.md

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+# Track Specification: Result Migration (Phase 2 — eliminate all bad exception handling)
+
+**Track ID:** `result_migration_20260616` (umbrella for the 5 sub-tracks below)
+**Status:** SHIPPED (campaign 100% complete as of 2026-06-20)
+**Priority:** A (foundational; the 3 refactored baseline files + 5 migration sub-tracks complete the data-oriented error handling convention)
+**Owner:** Tier 2 Tech Lead
+**Type:** refactor (5 sub-tracks, each a separate TDD execution)
+**Scope:** 268 sites across 42 files (per the `exception_handling_audit_20260616` audit)
+**Parent tracks:** `data_oriented_error_handling_20260606` (shipped 2026-06-12), `exception_handling_audit_20260616` (shipped 2026-06-16)
+**Sibling tracks:** `data_structure_strengthening_20260606` (planned, parallel; uses the cleaner Result API from this phase)
+
+> **Note on effort estimates:** per the Tier 1 rules (see `conductor/workflow.md`
+> §"Tier 1 Track Initialization Rules"), this spec does NOT include day
+> estimates. Effort is measured by scope (N files, M sites) and T-shirt
+> size (S/M/L/XL) per sub-track. The user / Tier 2 agent decides the
+> actual pacing.
+
+---
+
+## 0. TL;DR
+
+This is the **migration phase** that completes the data-oriented error
+handling convention. The 2026-06-12 parent track established the
+convention; this umbrella track plans 5 sub-tracks that eliminate the
+remaining 211 violations + 25 suspicious + 32 unclear = **268 "bad"
+sites** across the codebase.
+
+**Per-file baseline (per `exception_handling_audit_20260616`):**
+
+| Bucket | Files | V+S sites | What |
+|---|---|---|---|
+| **LARGE** | 2 (gui_2, app_controller) | 77 | Dedicated track per file (T-shirt: XL) |
+| **MEDIUM** | 2 (session_logger, warmup) | 15 | Folds into the small-files track |
+| **SMALL** | 35 | 57 | Batched in one track (T-shirt: L) |
+| **BASELINE** | 3 (mcp_client, ai_client, rag_engine) | 87 | Closes the gaps in the convention reference (T-shirt: L) |
+
+**5 sub-tracks with consistent `result_migration_*` prefix:**
+
+1. `result_migration_review_pass` (T-shirt: S) — 57 sites (32 UNCLEAR + 25 INTERNAL_RETHROW); updates the audit's heuristics
+2. `result_migration_small_files` (T-shirt: L) — 37 files (35 SMALL + 2 MEDIUM); **SHIPPED 2026-06-18** (Phase 13 complete: 11/11 tiers actually run; 9 PASS clean + 2 PASS with documented issues (REPORTED for diff tracks: test_execution_sim_live GUI subprocess crash + test_live_gui_workspace_exists xdist race); 4 pre-existing Gemini 503 tests documented with @pytest.mark.skip) (Phase 10 REJECTED for sliming 21 sites via 5 LAUNDERING HEURISTICS; Phase 11 REJECTED for keeping Heuristic #19 and missing the visit_Try audit bug; Phase 12 REJECTED for the false test claim — the test runner script crashed at 5/11 with UnicodeEncodeError; tier-1-unit-core FAILED with 3 unverified 'pre-existing' failures; 6 tiers not actually tested; Phase 12's '11 tiers total. 10 PASS' claim in commit 2235e4b8 is false; Phase 13 fixes the script crash, investigates the 3 failures, and verifies 11/11 PASS)
+3. `result_migration_app_controller` (T-shirt: XL) — 56 sites (35 V + 3 S + 2 ? + 16 C; 13 FastAPI boundary stay as-is)
+4. `result_migration_gui_2` (T-shirt: XL) — **55 sites** (37 V + 2 S + **14 ?** + 2 C; the 14 ? includes the +1 site from the review pass: `src/gui_2.py:1349`)
+5. `result_migration_baseline_cleanup` (T-shirt: L) — **112 sites (77 V + 10 S + 6 ? + 19 C in the 3 refactored files)** — **SHIPPED 2026-06-20**: migrated 88 migration-target sites across mcp_client.py (46) + ai_client.py (33) + rag_engine.py (9); all 3 baseline files V=0 (strict audit gate passes); 84 atomic commits across 14 phases; same anti-sliming template as sub-track 4. 122 unit tests pass. 1 regression caught + fixed (`test_set_tool_preset_with_objects` — `global` declaration lost in helper extraction). End-of-track report: `docs/reports/TRACK_COMPLETION_result_migration_baseline_cleanup_20260620.md`. TIER1_REVIEW report for Phase 9 dilemma: `docs/reports/TIER1_REVIEW_phase9_dilemma_20260620.md`. Known limitation: 9 Pattern 1/3 RETHROW sites remain (audit lacks heuristic; strict mode accepts); 4 pre-existing non-baseline INTERNAL_OPTIONAL_RETURN in external_editor/session_logger/project_manager (out of scope).
+
+**Total: 5 sub-tracks, 268 sites migrated, ~2100 lines changed across ~42 files. CAMPAIGN 100% COMPLETE (all 5 sub-tracks SHIPPED).**
+
+> **Post-Review Pass Update (2026-06-17, sub-track 1 shipped):**
+> After the review pass (`result_migration_review_pass_20260617`), the
+> UNCLEAR + INTERNAL_RETHROW sites are reclassified:
+> - **24 UNCLEAR sites** were in scope (the audit's "current state" count after the new heuristics was 24, not 32; the original 32 was the pre-heuristic count)
+> - **23 of 24 UNCLEAR sites are compliant** (reclassified by 10 new heuristics; only `src/gui_2.py:1349` is migration-target)
+> - **19 INTERNAL_RETHROW sites** are all compliant: 7 PATTERN_1 (Result→Exception bridge in baseline files) + 2 PATTERN_2 (catch+log+re-raise) + 9 compliant (standard `__getattr__`, abstract method, validation raise) + 1 audit-script bug (missed find)
+> - Net migration scope change: **sub-track 4 (gui_2) gains 1 site** (L1349). All other sub-tracks are unchanged.
+
+> **Post-Sub-Track-2 Update (2026-06-17, sub-track 2 shipped):**
+> After the small-files migration (`result_migration_small_files_20260617`),
+> the audit script is now correct (3 bugs fixed in Phase 1 of that sub-track),
+> and the 37 SMALL+MEDIUM files have been processed:
+> - **49/76 sites migrated** (6 full `Result[T]` + 43 exception narrowing) + 13 already compliant
+> - **27 sites remain `INTERNAL_SILENT_SWALLOW`** (narrow-catch + pass); **Phase 11 in progress** (REJECTS Phase 10's sliming; full Result[T] migration; not narrowing, not logging-only, not silent recovery)
+> - **Audit's UNCLEAR count: 7 → 21** (+14 sites) - the narrowing created patterns the audit's heuristics don't recognize; **Phase 11 in progress** (REJECTS Phase 10's 5 LAUNDERING heuristics; reverts them and adds legitimate Heuristic A)
+> - **Bonus defensive fix:** `try/except (OSError, tomllib.TOMLDecodeError)` in `load_track_state` unblocked 7+ tests
+> - **Test result:** all 11 test tiers PASS (tier-1-unit-comms, tier-1-unit-core, tier-1-unit-gui, tier-1-unit-headless, tier-1-unit-mma, tier-2-mock_app-comms, tier-2-mock_app-core, tier-2-mock_app-gui, tier-2-mock_app-headless, tier-2-mock_app-mma, tier-3-live_gui)
+> - **Documented G4 deviation:** 27 silent-swallow sites remain. **Phase 11 COMPLETE** (not Phase 10 — Phase 10 was REJECTED); full Result[T] migration for the 27 sites (5 full Result in warmup.py + 2 helper extracts + 14 documented as already compliant + 1 known limitation + 1 already Result from Phase 10). The user has directed that Result[T] is mandatory, not optional, given the project's heavy use of multi-threaded `io_pool` dispatch (Python has no wave-based preemptive thread pipelining, so every soft/hard failure point needs full context).
+>
+> **Phase 11 Update (2026-06-17, REJECTED Phase 10):**
+> Phase 10 attempted the full Result[T] migration but tier-2 SLIMED 21 of the 26 sites using `except SpecificError: ...; logger.warning(...); return default` (which is NOT a Result migration). Tier-2 also added 5 LAUNDERING HEURISTICS (#22-#26) to `scripts/audit_exception_handling.py` that classify narrowing as `INTERNAL_COMPLIANT` — these are rejected as laundering. Phase 11 REJECTS Phase 10, REVERTS the 5 laundering heuristics, and does the FULL `Result[T]` migration for the 21 slimed sites. **Result[T] is NOT optional.** No "context manager" or "user callback" excuses. The reference implementation is `src/hot_reloader.py` (which tier-2 did correctly); the same pattern must be applied to `warmup.py`. Test count claim must be 11 tiers (not 10).
+
+> **Phase 12 Update (2026-06-17, REJECTED Phase 11):**
+> **THE USER'S PRINCIPLE:** "IF ANY PLACE HAS A ERROR LOG IT ALSO NEEDS A RESULT[T]. RESULT[T] PROPOGATES UNTIL IT REACHED A 'DRAIN' POINT WHERE THE ERROR CAN BE HANDLED APPROPRIATELY WITHOUT CRASHING THE APP. THE APP SHOULD ALMOST NEVER CRASH UNLESS SOMETHING CRITICAL FAILS THAT PREVENTS IT FROM ACTUALLY OPERATING WITH ITS FEATURES."
+>
+> **THE USER'S DIRECTIVE ON THE STYLEGUIDE:** "make sure tier 2 is required to read that styleguide and make sure to update the style guide to be aware of the concept of a drain point, which just makes explicit a place where result[t]"
+>
+> Phase 11 was REJECTED for 3 reasons:
+> 1. **Heuristic #19 is LAUNDERING.** The "narrow + log = compliant" pattern is WRONG. Logging is NOT a drain. Phase 11 left Heuristic #19 in place; 6 sites in the "14 already compliant" claim were Laundering via Heuristic #19. Phase 12.1 REMOVES Heuristic #19.
+> 2. **The audit-script `visit_Try` walker is BUGGY.** It does NOT recurse into `node.body` (the try body itself), so nested Trys are silently dropped. I verified: `src/api_hooks.py` has 23 actual try/except nodes but the audit reports only 5 — a gap of 18 sites, 12+ of which are silent-fallback violations. Phase 12.2 FIXES this bug.
+> 3. **Tier-2 misclassified 2 sites.** The claims of "HTTP request handlers; classified `INTERNAL_COMPLIANT` via Heuristic #19" for `api_hooks.py:451` and `:824` are wrong about which heuristic applies. The actual code at L451 is `except (OSError, ValueError) as e: self.send_response(500)` (narrow + HTTP response, NOT a Heuristic #19 log call). The actual code at L824 is `except (OSError, ValueError) as e: import traceback; traceback.print_exc(file=sys.stderr)` (narrow + traceback, NOT a Heuristic #19 log call). Phase 12.6.1 migrates these.
+>
+> **Phase 12 ACTIONS:**
+> - 12.0: TIER-2 MUST READ `conductor/code_styleguides/error_handling.md` end-to-end BEFORE any Phase 12 code work. NO CODE; the read is acknowledged in the commit message of 12.0.1.
+> - 12.0.1: UPDATE `error_handling.md` with 3 changes: (A) add a "Drain Points" section with 5 patterns; (B) update the "Broad-Except Distinction" table to explicitly say `narrow + log = INTERNAL_SILENT_SWALLOW` violation (prevents Heuristic #19 regression); (C) add a MUST-READ rule to the AI Agent Checklist.
+> - 12.1: REMOVE Heuristic #19 (narrow+log laundering)
+> - 12.2: FIX the visit_Try audit bug (2-line change to recurse into node.body)
+> - 12.3: ADD Heuristic D (True Drain-Point Recognition) with 5 patterns: HTTP error response, GUI error display, intentional app termination, telemetry emission, retry-with-bounded-attempts
+> - 12.4-12.5: Re-audit and triage
+> - 12.6: Migrate ALL newly-revealed sites to `Result[T]` (per-file sub-batches)
+> - 12.7: Update callers
+> - 12.8: Update tests (including 1+ error-path test per migration)
+> - 12.9: Verify ALL 11 test tiers PASS (not 10; not 9)
+> - 12.10-12.12: Update reports and umbrella
+>
+> **WHAT IS A DRAIN POINT:** A function that HANDLES the error (not just records it). Examples: `try: ...; except: imgui.text(f"Error: {e}")` (user-visible error in GUI); `try: ...; except: self.send_response(500); self.wfile.write(json.dumps({"error": str(e)}))` (HTTP error response); `try: ...; except: sys.exit(f"Fatal: {e}")` (intentional app termination). NOT a drain point: `try: ...; except: sys.stderr.write(...); pass` (just log). Heuristic D recognizes the small set of legitimate drain points.
+
+> **Phase 13 Update (2026-06-17, REJECTED Phase 12):**
+> Phase 12 migrations were REAL and SUBSTANTIAL: 16 sites in `src/api_hooks.py` migrated to `Result[T]` (3 helpers extracted), 27 sites in 16 small files migrated to `Result[T]`, the styleguide was updated with the Drain Points section + the Broad-Except table update + the AI Agent Checklist MUST-READ rule, the audit-script had Heuristic #19 removed + visit_Try bug fixed + Heuristic D added with 5 drain-point patterns. Sub-track 2 audit post-fix: 0 violations, 0 UNCLEAR.
+>
+> **But Phase 12's test claim was FALSE:**
+> - The test runner script `scripts/run_tests_batched.py:185` crashed with `UnicodeEncodeError` (cp1252 can't encode the box-drawing characters in the summary table) after running only **5 of 11 tiers**.
+> - tier-1-unit-core FAILED with 3 unverified "pre-existing" failures. One of these (`test_gemini_provider_passes_qa_callback_to_run_script`) is a **mock assertion failure**, NOT a Gemini API 503 — it may be a Phase 12 regression.
+> - The 6 remaining tiers (tier-2-mock-comms/core/gui/headless/mma + tier-3-live_gui) were NOT executed.
+> - Tier-2's "verified via git stash before my changes" claim is UNVERIFIED — the test log shows no parent-commit run was performed.
+> - The "11 tiers total. 10 PASS" claim in commit `2235e4b8` is FALSE. **Actual count: 5 tested, 4 PASS, 1 FAIL, 6 NOT TESTED.**
+>
+> **Phase 13 ACTIONS:**
+> - 13.1: FIX the script crash in `scripts/run_tests_batched.py:185` (add `sys.stdout.reconfigure(encoding='utf-8', errors='replace')` at the start of `main()`). **This is the FIRST action; without it, no other test verification is possible.**
+> - 13.2: INVESTIGATE the 3 tier-1-unit-core failures on the parent commit (`4ab7c732`). For each test, run on parent and current; identify pre-existing vs regression. Record results to `tests/artifacts/PHASE13_PARENT_COMMIT_RESULTS.log`. **Per AGENTS.md HARD BAN: do NOT use `git restore` or `git checkout -- <file>`; use `git checkout <commit>` (whole commit) and return via `git checkout <branch>`.**
+> - 13.3: FIX any actual regressions found in 13.2. Candidates: `src/ai_client.py:_send_gemini` (test_gemini_provider_passes_qa_callback_to_run_script), `src/aggregate.py` (test_auto_aggregate_skip, test_view_mode_summary). The audit's 0 violations in sub-track 2 scope MUST be preserved.
+> - 13.4: DOCUMENT any confirmed pre-existing failures with `@pytest.mark.skip(reason=...)`. Per AGENTS.md: documentation of a known failure, not an excuse.
+> - 13.5: RE-RUN all 11 test tiers; verify the script completes and 11/11 PASS. The test count is 11, NOT 10. This is the **FIFTH time** this is being emphasized.
+> - 13.6-13.8: Update reports and umbrella with the actual test results.
+> - 13.9: Conductor - User Manual Verification.
+>
+> **The migrations stand. The test claim was wrong. Phase 13 fixes the test claim.**
+
+> **Phase 13 Resolution (2026-06-18, sub-track 2 SHIPPED):**
+> All 9 Phase 13 actions completed successfully:
+> - **13.1** DONE: scripts/run_tests_batched.py:185 UTF-8 crash fixed. Commit `0c62ab9d`.
+> - **13.2** DONE: 3 tier-1-unit-core failures investigated on parent commit `4ab7c732`. Log: `tests/artifacts/PHASE13_PARENT_COMMIT_RESULTS.log`. Commit `b96252e9`.
+> - **13.3** DONE: 0 regressions to fix. Phase 12.6 commits did NOT introduce any regressions.
+> - **13.4** DONE: 4 pre-existing Gemini 503 tests documented with `@pytest.mark.skip(reason=...)`. Commit `2f405b44`.
+> - **13.4b** DONE: User directive applied to test_execution_sim_live - switched from `gemini_cli` to `gemini` provider. STILL FAILS (GUI subprocess crash). Commit `6025a1d1`. **Reported for diff track.**
+> - **13.5** DONE: All 11 tiers actually run. Final results: 9 PASS clean + 2 PASS with documented issues (REPORTED for diff tracks: test_execution_sim_live + test_live_gui_workspace_exists).
+> - **13.6** DONE: Reports updated.
+> - **13.7** DONE: state.toml + metadata.json + tracks.md marked complete.
+> - **13.8** DONE: This umbrella spec.md updated.
+> - **13.9** PENDING: Conductor - User Manual Verification.
+>
+> **Test count is 11, NOT 10, NOT 9.** The 11th tier is tier-1-unit-comms.
+>
+> **Reported for diff tracks (NOT Phase 12 regressions):**
+> 1. `test_execution_sim_live`: GUI subprocess (port 8999) crashes mid-test during script generation flow. Same failure with both gemini_cli (mock subprocess) and gemini (real SDK). NOT provider-specific. The 90s timeout is reached without AI text. The GUI dies before the AI can respond.
+> 2. `test_live_gui_workspace_exists`: xdist race condition. The workspace can be cleaned up between fixture setup and the test assertion. Passes in isolation on both parent and current commit.
+
+
+
+---
+
+## 1. Overview
+
+### 1.1 The State Before This Phase (as of 2026-06-16)
+
+Per `exception_handling_audit_20260616`:
+
+- **Convention is applied to 3 of 65 `src/` files** (mcp_client.py, ai_client.py, rag_engine.py — the "baseline").
+- **62 `src/` files are in the migration-target state** — they still use idiomatic Python (`try/except`, `Optional[T]`, broad `except Exception`).
+- **211 violations + 25 suspicious + 32 unclear = 268 "bad" sites** across 42 files.
+- **Test pass count: 1288 + 4 + 0** (the codebase works correctly; the audit identifies refactor opportunities, not bugs).
+
+### 1.2 The Goal
+
+Migrate **all 268 "bad" sites** in the 42 affected files to the
+data-oriented error handling convention. After this phase, the
+codebase will have:
+
+- Zero `INTERNAL_SILENT_SWALLOW` (except ...: pass / log-only).
+- Zero `INTERNAL_BROAD_CATCH` (except Exception without ErrorInfo conversion, in non-`*_result` code).
+- Zero `INTERNAL_OPTIONAL_RETURN` (try/except + return None/Optional[T]).
+- Zero `INTERNAL_RETHROW` (try/except + raise without ErrorInfo conversion) — except where the new "Re-Raise Patterns" section allows.
+- Zero `UNCLEAR` (manual review confirms each is compliant or gets migrated).
+
+The 5 sub-tracks collectively achieve this. The convention's "delete to
+turn off" audit script (`scripts/audit_exception_handling.py`) becomes
+useful as a **CI gate** in `--strict` mode after this phase: any new
+violation introduced by future code will fail CI.
+
+### 1.3 The 5 Sub-Tracks (consistent `result_migration_*` prefix)
+
+All 5 sub-tracks follow the naming pattern `result_migration_<scope>_<YYYYMMDD>`.
+The umbrella spec uses placeholders; each sub-track gets its own date
+when it starts. The umbrella commit names (this spec) use `20260616`.
+
+#### Sub-track 1: `result_migration_review_pass_<YYYYMMDD>`
+
+**Scope:** 32 UNCLEAR + 25 INTERNAL_RETHROW = 57 sites across 15 files.
+**T-shirt size:** S (smallest sub-track; mostly research + audit-script edits).
+
+**Why first:** the UNCLEAR sites are ambiguous; a human review pass
+turns them into definite decisions (compliant or migration-target). The
+INTERNAL_RETHROW sites need the 3 legitimate re-raise patterns from
+`conductor/code_styleguides/error_handling.md` (added 2026-06-16) to be
+applied. Both feed into all later sub-tracks.
+
+**What it does:**
+- For each of the 32 UNCLEAR sites, a human looks at the site and decides
+  compliant-or-migration. Updates the audit's heuristics for sites
+  that turn out to be a common pattern.
+- For each of the 25 INTERNAL_RETHROW sites, classify as one of the 3
+  legitimate re-raise patterns (convert, log+raise, cleanup+raise) or
+  mark for migration.
+- Output: a doc with the per-site decision (added as an appendix to
+  this umbrella spec when the sub-track ships).
+
+**Dependency:** none (it's the first sub-track).
+
+#### Sub-track 2: `result_migration_small_files_<YYYYMMDD>`
+
+**Scope:** 37 files (the 35 SMALL + 2 MEDIUM from the `--by-size` bucket);
+**76 sites (62V + 10S + 4 UNCLEAR) → 49 migrated + 13 already compliant + 27 silent-swallow remain.**
+**T-shirt size:** L (batched; ~750 lines changed across 37 files + 1 audit script + 1 new test file).
+**Status:** **shipped 2026-06-17** with documented G4 deviation (27 sites remain `INTERNAL_SILENT_SWALLOW`; **Phase 11 of this sub-track** REJECTS Phase 10's sliming of 21 sites and does the full Result[T] migration per the user's explicit direction).
+
+**Why second:** the small files are quick wins; they don't depend on
+the orchestrator (app_controller) or the GUI. Some of them DO depend on
+sub-track 1's review pass (so the UNCLEAR sites are classified first).
+Phase 1 of this sub-track (audit-script bug fixes) unblocks sub-tracks
+3 and 4 by giving them an audit that classifies correctly.
+
+**What it did:**
+- **Phase 1: 3 audit-script bug fixes** (TDD) — fixed the 3 bugs documented
+  in the review-pass report §4.4:
+  - `visit_Try` walker now visits ALL except handlers (was only walking the last)
+  - `render_json` per-file list now includes all findings (was filtering compliant)
+  - `render_json` no longer truncates per-file list to top 15 (default now 200)
+- **Phase 2: 4 UNCLEAR classifications** (2 migration-target + 2 compliant; decisions in
+  `docs/reports/RESULT_MIGRATION_SMALL_FILES_20260617.md`)
+- **Phases 3-8: 49/76 sites migrated** using two strategies:
+  - **Strategy A: Full `Result[T]` migration** (2 files, 6 sites): `summary_cache.py`, `log_registry.py`.
+    Backwards-compatible (callers ignore the Result return).
+  - **Strategy B: Exception narrowing** (24 files, 43 sites): changed `except Exception`
+    to specific stdlib/domain exceptions. Public API unchanged; behavior unchanged; no
+    caller updates needed. This is a **partial migration** — the convention's FR4
+    says "convert to Result[T]", but the spec also acknowledged (R5) that cascading
+    public API changes may be acceptable. Tier 2 chose narrowing for 43 sites to
+    avoid ~100+ caller updates. **Caveat:** narrowing without `logging.warning(...)`
+    is **silent recovery** (no trace). The 27 sites that remain `INTERNAL_SILENT_SWALLOW`
+    are documented in the track completion report; **Phase 11 of this sub-track** is
+    actively doing the full Result[T] migration for them (REJECTS Phase 10's sliming).
+- **Phase 9: Verification** — all 11 test tiers PASS; per-site report + track
+  completion report written; state.toml + metadata.json marked completed.
+- **Bonus defensive fix:** `try/except (OSError, tomllib.TOMLDecodeError)` in
+  `load_track_state` (in `src/project_manager.py`) for a pre-existing malformed
+  state.toml crash. Unblocked 7+ tests.
+
+**Documented G4 deviation:** 27 sites remain `INTERNAL_SILENT_SWALLOW` (narrow-catch +
+pass or narrow-catch + return None). These are categorized as:
+- **Category A (intentional silent recovery, 17 sites):** Known failure modes where the
+  caller has no use for the error info (e.g., `file_cache.py:98` mtime cache fallback,
+  `outline_tool.py:90` ast.unparse fallback, `startup_profiler.py:40` profile output
+  with `stderr.write` as a log). Should add `logging.debug(...)` per the audit's
+  heuristic #19 to confirm intent.
+- **Category B (user-input-driven, 10 sites):** Callbacks and reload paths where any
+  exception is possible (e.g., `warmup.py:139/215/249` user callbacks, `hot_reloader.py:58`
+  module reload). Should add `logging.warning(...)` to surface user errors.
+
+**Migration-target sites introduced by the narrowing:** the audit's UNCLEAR count
+went **7 → 21** (+14 sites) because the narrowing created patterns the audit's
+heuristics don't recognize. **Phase 11 of this sub-track** adds the legitimate Heuristic A (Result-returning recovery in non-*_result function)
+(heavily-narrowed `except` without logging; `except` returning Result in non-`*_result`
+function) that reclassify these.
+
+**Dependency:** sub-track 1 (for the UNCLEAR classification). Unblocks sub-tracks 3 and 4
+by fixing the audit script.
+
+#### Sub-track 3: `result_migration_app_controller_<YYYYMMDD>`
+
+**Scope:** `src/app_controller.py` (166KB); 56 sites (35 V + 3 S + 2 ? + 16 C).
+**T-shirt size:** XL (the orchestrator; high coordination with Hook API + MMA + RAG; ~700 lines changed in 1 file).
+
+**Why dedicated:** the controller is the orchestrator; it touches every
+subsystem. Changes here require careful coordination with the
+`_predefined_callbacks` and `_gettable_fields` Hook API registries, the
+MMA conductor, and the RAG engine.
+
+**What it does:**
+- Migrates the 22 migration-target sites (35 V - 13 FastAPI boundary = 22).
+- The 13 FastAPI boundary sites (per the new "Boundary Types" section in
+  `conductor/code_styleguides/error_handling.md`) stay as-is.
+- The 16 compliant sites stay as-is.
+- Uses the 5-file-commit pattern from the parent track's
+  `doeh_test_thinking_cleanup_20260615` (not 11 separate test mocks).
+- Adds tests for the new Result-based API (similar to
+  `test_ai_client_result.py`).
+
+**Dependency:** sub-track 1 (for the 2 UNCLEAR sites at lines 1842 and 1668).
+
+#### Sub-track 4: `result_migration_gui_2_<YYYYMMDD>`
+
+**Scope:** `src/gui_2.py` (260KB); **55 sites** (37 V + 2 S + **14 ?** + 2 C; the 14 ? includes the +1 site from the review pass: `src/gui_2.py:1349`).
+**T-shirt size:** XL (the largest file; immediate-mode UI; ~700 lines changed in 1 file).
+
+**Why dedicated:** the largest file in the codebase. The immediate-mode
+UI means changes here affect every render frame. The migration should
+be done incrementally with the hot-reload mechanism (`Ctrl+Alt+R`) so
+the user can verify each change visually.
+
+**What it does:**
+- Migrates the 37 V + 2 S + 14 ? = **53 migration-target sites** (the 14 ? includes the +1 site from the review pass: `src/gui_2.py:1349`, the only UNCLEAR site the review pass classified as migration-target).
+- The 2 compliant sites stay as-is.
+- The 13 UNCLEAR sites are the trickiest (per sub-track 1's review pass).
+- Uses the hot-reload mechanism for visual verification.
+
+**Dependency:** sub-track 1 (for the 13 UNCLEAR sites); sub-track 3
+(strong coordination, since app_controller calls gui_2 methods; the
+controller should be migrated first to give the GUI a clean API).
+
+#### Sub-track 5: `result_migration_baseline_cleanup_<YYYYMMDD>`
+
+**Scope:** the 3 refactored files (mcp_client.py, ai_client.py,
+rag_engine.py); 112 sites (77 V + 10 S + 6 ? + 19 C).
+**T-shirt size:** L (parent's Path C deferred work; ~600 lines changed across 3 files).
+
+**Why last:** the baseline files ARE the convention reference. The
+remaining 77 violations are gaps in the reference (mostly the parent's
+"deferred" work — the 30+ tool functions in mcp_client.py, the
+SDK-exception-classification helpers in ai_client.py, the non-`*_result`
+methods in rag_engine.py). Closing these makes the convention reference
+**pure** — no migration-target sites in the baseline.
+
+**What it does:**
+- Migrates the 30+ tool functions in mcp_client.py (the parent's Path C
+  deferred work).
+- Migrates the broad-catches in the SDK-exception-classification helpers
+  in ai_client.py (catch `anthropic.APIError` + convert to ErrorInfo).
+- Migrates the non-`*_result` methods in rag_engine.py.
+- Result: the 3 refactored files become 100% convention-compliant.
+
+**Dependency:** none (independent of the other 4 sub-tracks; can run in
+parallel with sub-tracks 2-4 if the Tier 2 agents coordinate).
+
+### 1.4 Out of Scope (Explicit)
+
+- **`send_result` → `send` mass rename** (user's stated manual refactor;
+  separate work after this phase ships).
+- **`data_structure_strengthening_20260606`** (parallel track; uses the
+  cleaner Result API from this phase).
+- **`live_gui_mock_injection_20260615`** (separate infrastructure track).
+- **Removing the `send()` deprecation** (followup; once the rename ships).
+- **Migrating `tests/` files** (the `public_api_migration_20260606` track
+  already migrated 22 test files to `send_result()`; the remaining tests
+  are out of scope for this phase).
+- **Adding new `Result` patterns to areas that don't have any** (this
+  phase migrates EXISTING `try/except` sites, not adds new ones).
+
+---
+
+## 2. Recommended Sequence
+
+```
+[Track 1: review pass]              (S; informational; can run in parallel with 2-5)
+       ↓
+[Track 2: small files]              (L; 37 files)
+       ↓
+[Track 3: app_controller]           (XL; high coordination)
+       ↓
+[Track 4: gui_2]                    (XL; depends on 3 for clean API)
+       ↓
+[Track 5: baseline cleanup]         (L; can run in parallel with 3-4)
+```
+
+**Parallelization options:**
+- Tracks 2 + 5 can run in parallel (different files).
+- Tracks 3 + 5 can run in parallel (different files; both touch
+  app_controller's interface but Track 5 only touches the convention
+  reference files).
+- Track 4 depends on Track 3 (the GUI calls controller methods).
+- Track 1 is independent (informational; can run any time).
+
+---
+
+## 3. Architecture Reference
+
+### 3.1 The Convention
+
+- `conductor/code_styleguides/error_handling.md` — the canonical
+  styleguide (5 patterns + 5 doc-clarification sections added 2026-06-16)
+- `docs/AGENTS.md` §"The 4 memory dimensions" — the cross-cutting lens
+- `docs/guide_ai_client.md` "Data-Oriented Error Handling (Fleury
+  Pattern)" — the in-context guide for the provider layer
+- `docs/guide_mcp_client.md` "Data-Oriented Error Handling (Fleury
+  Pattern)" — the in-context guide for the MCP tool layer
+- `docs/guide_rag.md` "Data-Oriented Error Handling (Fleury Pattern)"
+  — the in-context guide for the RAG engine
+- `conductor/code_styleguides/data_oriented_design.md` — the canonical
+  DOD reference
+
+### 3.2 The Audit Script
+
+- `scripts/audit_exception_handling.py` — the static analyzer
+  (10-category classification; `--json`, `--top`, `--verbose`, `--strict`,
+  `--summary`, `--by-size` modes)
+- `docs/reports/EXCEPTION_HANDLING_AUDIT_20260616.md` — the audit
+  report (the 268-site inventory; the per-file + per-category breakdown)
+- `docs/guide_app_controller.md` "Exception Handling" — the
+  app_controller-specific guide (the 13 FastAPI boundary sites; the 22
+  migration-target sites)
+
+### 3.3 The 4 Enforcement Audit Scripts (CI gates)
+
+This phase's goal is to make `--strict` mode of
+`scripts/audit_exception_handling.py` a viable CI gate. The other 3
+enforcement scripts are:
+
+- `scripts/audit_weak_types.py` — the `dict[str, Any]` / `list[dict[...]]`
+  type-strengthening audit
+- `scripts/audit_optional_in_3_files.py` — the `Optional[T]` return type
+  ban in the 3 refactored files (referenced by `error_handling.md` but
+  not yet committed; should be created in `data_structure_strengthening_20260606`
+  per its spec §12.2)
+- `scripts/audit_main_thread_imports.py` — the main-thread import
+  graph purity invariant
+
+After this phase ships, all 4 scripts should be wired into CI as
+`--strict` mode gates.
+
+---
+
+## 4. Per-Sub-Track Plan (just sub-track 1; the rest are detailed when each sub-track starts)
+
+Sub-track 1 (`result_migration_review_pass`) is the only one with a
+detailed plan; the other 4 are detailed when each starts. The reason:
+the audit's UNCLEAR + INTERNAL_RETHROW classification may change the
+migration scope of the later sub-tracks (some UNCLEAR sites may turn
+out to be compliant, reducing the migration work).
+
+### Phase 1: Setup (Sub-track 1)
+
+- [x] **Task 1.1: Initialize the sub-track folder**
+  - WHERE: `conductor/tracks/result_migration_review_pass_<YYYYMMDD>/`
+  - WHAT: spec.md, plan.md, metadata.json
+  - HOW: Copy this umbrella spec as the starting point; customize for the review pass
+
+- [x] **Task 1.2: Update `conductor/tracks.md`**
+  - WHERE: `conductor/tracks.md` (new row for the sub-track)
+  - WHAT: Add the sub-track under the umbrella row
+  - HOW: Same pattern as the previous tracks
+
+### Phase 2: Review (Sub-track 1)
+
+- [x] **Task 2.1: Review the 32 UNCLEAR sites**
+  - WHERE: All `src/` files
+  - WHAT: For each site, decide compliant-or-migration; record the
+    decision in a doc
+  - HOW: Use the audit's JSON output; for each site, read the snippet
+    + context + 2-3 lines around it; classify
+
+- [x] **Task 2.2: Classify the 25 INTERNAL_RETHROW sites**
+  - WHERE: All `src/` files
+  - WHAT: For each site, apply the 3 legitimate re-raise patterns from
+    the new styleguide section; record the decision
+  - HOW: Same as 2.1; the decisions feed into the migration scope of
+    sub-tracks 2-4
+
+- [x] **Task 2.3: Update the audit script's heuristics**
+  - WHERE: `scripts/audit_exception_handling.py`
+  - WHAT: For sites that turned out to be compliant (a common pattern
+    the script doesn't recognize), add a heuristic to the
+    classification logic
+  - HOW: Add to the `_classify_except` / `_classify_raise` functions
+
+### Phase 3: Report (Sub-track 1)
+
+- [x] **Task 3.1: Write the review pass report**
+  - WHERE: `docs/reports/RESULT_MIGRATION_REVIEW_PASS_<YYYYMMDD>.md`
+  - WHAT: Per-site decision table; updated migration scope for the
+    later sub-tracks; updated audit script heuristics
+  - HOW: Use the format of the `EXCEPTION_HANDLING_AUDIT_20260616.md`
+    report
+
+### Phase 4: Verification (Sub-track 1)
+
+- [x] **Task 4.1: Verify the updated audit script**
+  - WHERE: `scripts/audit_exception_handling.py`
+  - WHAT: Re-run the audit; the UNCLEAR count should drop to 0; the
+    INTERNAL_RETHROW count should drop to whatever the 3 legitimate
+    patterns don't cover
+  - HOW: `uv run python scripts/audit_exception_handling.py --by-size`
+
+- [x] **Task 4.2: Document the updated migration scope**
+  - WHERE: This umbrella spec (the per-sub-track plan section)
+  - WHAT: The sub-track 2-4 scope may change after the review pass;
+    document the changes
+
+---
+
+## 5. Verification Criteria (per sub-track)
+
+Each sub-track has its own verification criteria. The umbrella's criteria
+are that **all 5 sub-tracks pass their criteria**; the umbrella is
+"complete" when:
+
+- 268 sites migrated (or marked as legitimate via the review pass).
+- `--strict` mode of the audit script returns 0 (no violations).
+- Full test suite: 1288 + 4 + 0 (unchanged; the migration is
+  behavior-preserving).
+- The convention is now fully applied to all 65 `src/` files.
+- The 4 enforcement audit scripts can be wired into CI as `--strict`
+  gates.
+
+---
+
+## 6. Risks & Mitigations
+
+| ID | Risk | Likelihood | Impact | Mitigation |
+|---|---|---|---|---|
+| R1 | The 5 sub-tracks are larger than expected (the parent's Path C deferred work is bigger than estimated) | Medium | High | Track 5 (baseline cleanup) is the biggest risk — the 30+ tool functions in mcp_client.py may be bigger than expected. The plan acknowledges scope can grow; the user decides whether to split sub-tracks further. |
+| R2 | The migration breaks the Hot Reload mechanism (changes to gui_2.py don't hot-reload correctly) | Medium | High | Sub-track 4 uses the hot-reload mechanism for visual verification. The migration should be done incrementally; the user can verify each change visually. |
+| R3 | The migration breaks the Hook API (changes to app_controller.py break the `_predefined_callbacks` / `_gettable_fields` registries) | Low | High | Sub-track 3 includes a "before/after" verification of the Hook API (via `live_gui` tests). The convention's `Result` type is structurally compatible with the existing str/None return types if needed. |
+| R4 | The review pass (sub-track 1) reveals that more sites are violations than the audit's heuristics suggest | Medium | Medium | The review pass updates the audit's heuristics; the migration scope for sub-tracks 2-4 may grow. The plan documents the scope changes in Phase 4. |
+| R5 | The user wants a different sub-track ordering (e.g., the orchestrator first) | Low | Low | The plan recommends a sequence but the user can reorder. The sub-tracks are independent enough to swap. |
+
+---
+
+## 7. Commits (the umbrella + 5 sub-tracks, in order)
+
+The umbrella is 1 commit. Each sub-track is 5+ commits (spec, plan, metadata, code, docs).
+Total: 1 + 5*5 = 26 commits across the 5 sub-tracks.
+
+---
+
+
+## Phase 14 Update (2026-06-18): Live GUI Test Fixes
+
+Sub-track 2 (`result_migration_small_files_20260617`) shipped on
+2026-06-17 with **2 documented test infrastructure issues** that blocked
+full closure. The follow-up track `live_gui_test_fixes_20260618` was
+created and shipped on 2026-06-18 with both fixes applied.
+
+### The 2 fixes
+
+**Issue 1: `test_execution_sim_live` GUI subprocess crash (`tier-3-live_gui`)**
+- Symptom: GUI subprocess (port 8999) crashes mid-test with `0xC00000FD = STATUS_STACK_OVERFLOW`
+- Root cause: `imgui.set_window_focus("Response")` was called directly during the response panel render, exhausting the GUI main thread's 1.94 MB stack on Windows
+- Fix: defer the focus call to the next frame's idle phase via a new `_pending_focus_response` flag
+- Same root cause as `test_z_negative_flows.py` documented in `docs/reports/NEGATIVE_FLOWS_INVESTIGATION_20260617_REFINED.md`
+
+**Issue 2: `test_live_gui_workspace_exists` xdist race (`tier-1-unit-gui`)**
+- Symptom: xdist race where the owner worker's teardown removes the shared workspace path before a client worker's test can assert it exists
+- Root cause: `live_gui_workspace` fixture returned the path without ensuring it existed
+- Fix: call `workspace.mkdir(parents=True, exist_ok=True)` before returning
+- Pre-existing on parent commit `4ab7c732` (verified)
+
+### Final test pass count: 11/11 tiers PASS clean
+
+After both fixes, **all 11 test tiers pass clean** (~825s total). This
+is the final pass count for sub-track 2. The 4 Gemini 503 pre-existing
+skip markers remain (out of scope for the live_gui_test_fixes track;
+deferred to a follow-up track to mock the Gemini API in
+`summarize.summarise_file`).
+
+### Sub-track 2 status
+
+Sub-track 2 (`result_migration_small_files_20260617`) is now FULLY
+ready for merge with no documented issues from the live_gui_test_fixes
+track. Sub-track 3 (`result_migration_app_controller`) is unblocked.
+
+### References
+
+- `conductor/tracks/live_gui_test_fixes_20260618/spec.md` - the fix track spec
+- `conductor/tracks/live_gui_test_fixes_20260618/plan.md` - the fix track plan
+- `docs/reports/TRACK_COMPLETION_live_gui_test_fixes_20260618.md` - the fix track completion report
+- `tests/artifacts/PHASE14_TEST_RUN_RESULTS.log` - 11/11 tier verification
+
+## 8. See Also
+
+- `conductor/code_styleguides/error_handling.md` — the canonical convention
+  (5 patterns + 5 doc-clarification sections)
+- `conductor/code_styleguides/data_oriented_design.md` — the canonical
+  DOD reference
+- `docs/reports/EXCEPTION_HANDLING_AUDIT_20260616.md` — the audit
+  report (the 268-site inventory)
+- `scripts/audit_exception_handling.py` — the static analyzer (with
+  `--summary` and `--by-size` modes)
+- `conductor/tracks/exception_handling_audit_20260616/spec.md` — the
+  audit track's spec
+- `conductor/tracks/data_oriented_error_handling_20260606/spec.md`
+  §12.2 — the parent's prioritized list of future migration tracks
+  (this umbrella replaces that list)
+- `conductor/tracks/data_structure_strengthening_20260606/spec.md` —
+  the parallel track (uses the cleaner Result API from this phase)