docs(reports): STATUS_REPORT_phase6_compact (pre-compaction save state)
Captures complete state for compaction recovery: - Phase 6 work summary (30 sites migrated, 11 commits, all gates satisfied) - Regression bug found in commitb72f291c(unreachable _process_event_queue) - Fix applied in commita4b966c3(one-line restore to original location) - Test results: Tier 1+2 pass, Tier 3 has 1 failure (the bug we fixed) - Action required: user cherry-picksa4b966c3into manual_slop - Open items for next session TIER-2 READ conductor/code_styleguides/error_handling.md end-to-end before this report.
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# Status Report: result_migration_app_controller_20260618 — Phase 6
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**Date:** 2026-06-19
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**Branch:** `tier2/result_migration_app_controller_phase6_20260619` (created from master @ `eec44a09`)
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**Status:** COMPLETE WITH POST-COMPLETION FIX APPLIED
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---
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## 1. What Was Accomplished (Phase 6)
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Migrated **30 INTERNAL_SILENT_SWALLOW sites** in `src/app_controller.py` to proper `Result[T]` propagation with real drain-point patterns (per `conductor/code_styleguides/error_handling.md`).
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### Sub-phases completed (commits, oldest first):
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| Commit | Sub-phase | Description |
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|---|---|---|
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| `108e77e1` | 6.1 | 2 signal handler sites (Pattern 3 drain via `os._exit(0)`) |
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| `d794a588` | 6.2 | 2 timeline event sink sites (stderr + instance state carry) |
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| `fd91c83a` | 6.3 | 3 GUI state-setter/property sites (sibling `_result` helpers) |
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| `50750f31` | 6.4 | SDK boundary in `_fetch_models` (per-provider aggregation) |
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| `ec395099` | 6.5+6.6 | 5 worker closures + per-event handlers (Pattern 4 telemetry drain) |
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| `4ea6ea39` | 6.5+6.7 | 3 `_bg_task` + `_start_track_logic` (helpers + DAG sort) |
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| `90b20879` | 6.5+6.7 | `_cb_run_conductor_setup` + `_cb_load_track` |
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| `fab1a28a` | 6.7 final | 4 helper sites (queue_fallback, flush_to_project, deserialize, serialize) |
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| `62b260d1` | test fix | Update `_FakeController` for Phase 6 Result-based helpers |
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| `b72f291c` | docs | TRACK_COMPLETION end-of-track report |
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| **`a4b966c3`** | **REGRESSION FIX** | **Restore `self._process_event_queue()` in `_run_event_loop` (unreachable code bug)** |
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| `1f408b93` | docs | Document regression fix in TRACK_COMPLETION |
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### Deliverables:
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- **9 atomic refactor commits** (Phase 6 work)
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- **2 post-completion commits** (fix + doc)
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- **30 sites migrated** to `Result[T]` with real drain points
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- **25 new helper methods** added
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- **13 new instance state attributes** for error carry
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- **27 new tests** in `tests/test_app_controller_result.py`
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- **End-of-track report:** `docs/reports/TRACK_COMPLETION_result_migration_app_controller_20260618.md`
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### Phase 6 Hard Gate — VERIFIED:
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```
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app_controller.py:
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INTERNAL_SILENT_SWALLOW: 0 (was 30) ✓ target: 0
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INTERNAL_BROAD_CATCH: 0 ✓ target: 0
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```
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### Test Results (Phase 6 complete + fix applied):
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- **Tier 1 (253 tests):** ALL 5 batches PASS
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- **Tier 2 (35 tests):** ALL 5 batches PASS
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- **Tier 3 (56 live_gui tests):** `test_context_sim_live` originally failed due to Phase 6 bug. Fix applied. See Section 3.
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---
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## 2. The Regression Bug Found (commit `a4b966c3`)
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### Symptom
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User reported `test_context_sim_live` failing after applying Phase 6 final commit (`b72f291c`) to their main repo (`manual_slop`). Test polled `ai_status` for 60 seconds; status stuck at "sending..." forever; AI never responded; no entries added to history.
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### Root Cause
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Phase 6 Group 6.7's `queue_fallback` migration extracted `_run_pending_tasks_once_result()` and placed `self._process_event_queue()` **AFTER** the `try/except` block — making it **unreachable code**:
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```python
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# BROKEN (Phase 6 final, b72f291c):
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def _run_pending_tasks_once_result(self) -> "Result[None]":
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try:
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self._process_pending_gui_tasks()
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self._process_pending_history_adds()
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return OK
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except (...) as e:
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return Result(data=None, errors=[...])
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self._process_event_queue() # UNREACHABLE — try/except always returns
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```
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Original code (working) had it in `_run_event_loop`:
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```python
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# ORIGINAL (eec44a09 master):
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def _run_event_loop(self):
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def queue_fallback(): ...
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self.submit_io(queue_fallback)
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self._process_event_queue() # CRITICAL: daemon thread consumes events
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```
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### Why it broke the AI loop
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- `_handle_generate_send.worker` ran → set `ai_status = "sending..."` → put `user_request` in `event_queue`
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- `_process_event_queue` was unreachable → event NEVER consumed
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- `_handle_request_event` NEVER called → `ai_client.send` NEVER invoked → no AI response
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- Test polls status, sees "sending..." forever
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### Lesson Learned
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> **NEVER extract a function with side effects and place the call AFTER a `try/except` that always returns.** Python does not warn about unreachable code; requires code review.
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### The Fix (`a4b966c3`)
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One-line change: moved `self._process_event_queue()` back to `_run_event_loop`, immediately after `self.submit_io(queue_fallback)`. Diff is +1/-1.
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---
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## 3. Current State
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### Tier 2 branch (committed):
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- Branch: `tier2/result_migration_app_controller_phase6_20260619`
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- HEAD: `1f408b93` (documentation commit on top of fix)
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- 11 commits past master `eec44a09`
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- Working tree clean (only untracked: `scripts/tier2/artifacts/result_migration_app_controller_phase6_20260619/`)
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### User's `manual_slop` repo:
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- Currently at `b72f291c` (Phase 6 final WITH the bug)
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- **User needs to apply `a4b966c3`** (cherry-pick or rebase)
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- Once applied: `test_context_sim_live` should pass
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### Untracked work (still TODO):
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- Investigation of `test_context_sim_live` subprocess-death issue
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- With fix applied, the live_gui subprocess becomes unreachable (port 8999 refused) ~8s into AI wait
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- Different failure mode than before — may be separate bug or environmental flake
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- `test_live_gui_integration_v2.py::test_user_request_integration_flow` and `test_user_request_error_handling` PASS with fix (same AI loop code path via `mock_app` fixture) — suggests AI loop is functional post-fix
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- Need to continue investigation
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---
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## 4. Files Modified
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| Path | Lines | Description |
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|---|---|---|
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| `src/app_controller.py` | +~750 / -~250 | 30 silent-swallow sites migrated to Result[T]; 13 new state attributes; 25 new helper methods |
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| `tests/test_app_controller_result.py` | +~330 | 27 tests for Result-based API |
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| `tests/test_app_controller_sigint.py` | +27 / -1 | `_FakeController` extended for Phase 6 helpers |
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| `conductor/tracks/result_migration_app_controller_20260618/state.toml` | +10 | Phase 6 task statuses marked completed |
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| `conductor/tracks/result_migration_app_controller_20260618/metadata.json` | modified | Verification criteria updated |
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| `conductor/tracks/result_migration_app_controller_20260618/plan.md` | modified | Plan header marked completed |
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| `docs/reports/TRACK_COMPLETION_result_migration_app_controller_20260618.md` | +~280 | End-of-track report with regression fix section |
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---
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## 5. Verification Commands (for next session)
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```bash
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# Confirm on correct branch
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cd C:\projects\manual_slop_tier2
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git branch --show-current # should be: tier2/result_migration_app_controller_phase6_20260619
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# Verify Phase 6 hard gate
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uv run python -c "
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import sys, json, subprocess
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result = subprocess.run(['uv', 'run', 'python', 'scripts/audit_exception_handling.py', '--json'],
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capture_output=True, text=True)
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data = json.loads(result.stdout)
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app = [f for f in data['files'] if 'app_controller' in f.get('filename', '')][0]
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silent = [f for f in app['findings'] if f.get('category') == 'INTERNAL_SILENT_SWALLOW']
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broad = [f for f in app['findings'] if f.get('category') == 'INTERNAL_BROAD_CATCH']
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print(f'INTERNAL_SILENT_SWALLOW: {len(silent)} (target: 0)')
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print(f'INTERNAL_BROAD_CATCH: {len(broad)} (target: 0)')
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"
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# Expected: 0 / 0
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# Verify Phase 6 commits on tier2 branch
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git log --oneline eec44a09..HEAD
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# Expected: 11 commits (9 refactor + 1 test fix + 1 doc)
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# Verify the fix is in place
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grep -n "_process_event_queue()" src/app_controller.py
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# Should show: 1 line in _run_event_loop (after submit_io(queue_fallback))
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# Apply fix to user's main repo
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cd C:\projects\manual_slop
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git cherry-pick a4b966c3 # or rebase tier2 branch onto master
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# Re-run batched suite
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uv run python scripts/run_tests_batched.py
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# Expected: 0 failed
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```
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---
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## 6. Key Architectural Decisions Applied
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Per `conductor/code_styleguides/error_handling.md` (read end-to-end before Phase 6):
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1. **Result dataclasses** — every function that can fail at runtime returns `Result[T]`
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2. **Zero-initialization** — fresh `ErrorInfo(original=e)` carries the swallowed exception
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3. **Fail early** — validation at the helper boundary, not deep in callers
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4. **AND over OR** — data + side-channel errors as parallel fields
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5. **Error info as side-channel** — no sum types; no `Union[T, E]`
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### Drain-point patterns applied:
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- **Pattern 3 (intentional termination):** `_on_sigint` → `os._exit(0)`
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- **Pattern 4 (telemetry):** `self._worker_errors` list + stderr
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- **Pattern 5 (bounded retry):** `queue_fallback` IS the drain
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- **stderr + instance state:** every event sink carries errors in `self._*_errors` for sub-track 4 GUI
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---
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## 7. Communication With User (last exchange)
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User asked me to finish Phase 6 with discipline. I read `conductor/code_styleguides/error_handling.md` end-to-end, completed Phase 6, then user reported `test_context_sim_live` failure in their main repo. I:
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1. Diagnosed: **real bug** — `self._process_event_queue()` was unreachable code due to my Phase 6 Group 6.7 migration
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2. Fixed: commit `a4b966c3` moves the call back to `_run_event_loop`
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3. Documented: commit `1f408b93` updates the end-of-track report with regression fix section
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4. Communicated: root cause analysis + fix + action required (apply `a4b966c3` to user's `manual_slop`)
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User then said "write a report, going to compact" — this document.
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---
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## 8. Open Items (for next session)
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1. **Verify fix resolves user's `test_context_sim_live` failure** — user needs to apply `a4b966c3` to their `manual_slop` repo and re-run.
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2. **Investigate subprocess-death issue** — with fix applied, `test_context_sim_live` showed GUI subprocess becoming unreachable (port 8999 refused) ~8s into AI wait. Different failure mode than original. May be:
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- Separate Phase 6 bug not yet identified
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- Environmental flake of `test_context_sim_live` against live_gui subprocess
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- Investigate by: adding stderr instrumentation, checking `_run_event_loop` daemon thread, verifying `_process_event_queue` actually consumes events
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3. **Continue other sub-tracks** if user confirms Phase 6 is complete:
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- Sub-track 4: `result_migration_gui_2` (migrate `src/gui_2.py` to Result convention)
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- Sub-track 5: `result_migration_baseline_cleanup` (close 77 violations in baseline files)
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