docs(reports): TRACK_COMPLETION_data_structure_strengthening_20260606
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# TRACK COMPLETION: data_structure_strengthening_20260606
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**Track:** Data Structure Strengthening (Type Aliases + NamedTuples)
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**Status:** COMPLETE (2026-06-21)
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**Branch:** `tier2/data_structure_strengthening_20260606`
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**Total Commits:** 19 atomic commits
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**Test Status:** 20/20 new tests pass; no regressions in 132 related tests
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---
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## 1. Executive Summary
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The track introduces 10 `TypeAlias` definitions + 1 `NamedTuple` in a new
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`src/type_aliases.py` module and mechanically replaces 416 anonymous
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`dict[str, Any]` / `list[dict[...]]` / tuple-return weak types across 6
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high-traffic files. After the refactor, the audit count drops from 528
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to 112 (79% reduction). The remaining 112 sites are in 27 lower-impact
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files (deferred to future incremental tracks).
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A new `scripts/generate_type_registry.py` auto-generates
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`docs/type_registry/` — field-level documentation for every `@dataclass`,
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`NamedTuple`, and `TypeAlias` in `src/`. The script has `--check` mode
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for CI drift detection.
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The convention is enforced by `scripts/audit_weak_types.py --strict`,
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which compares the current weak-type count against a committed baseline
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file (`scripts/audit_weak_types.baseline.json`). New `dict[str, Any]`
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or `list[dict[...]]` introductions in `src/` will fail CI.
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## 2. The 10 TypeAliases + 1 NamedTuple
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| Alias | Resolves to | Semantic Role |
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|---|---|---|
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| `Metadata` | `dict[str, Any]` | The root alias; any key-value record |
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| `CommsLogEntry` | `Metadata` | A single entry in the AI comms log |
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| `CommsLog` | `list[CommsLogEntry]` | The comms log ring buffer |
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| `HistoryMessage` | `Metadata` | A single message in the AI provider history (UI layer) |
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| `History` | `list[HistoryMessage]` | The conversation history |
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| `FileItem` | `Metadata` | A single file in the context |
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| `FileItems` | `list[FileItem]` | The most common weak pattern in the codebase |
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| `ToolDefinition` | `Metadata` | A single tool definition |
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| `ToolCall` | `Metadata` | A single tool call from the model |
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| `CommsLogCallback` | `Callable[[CommsLogEntry], None]` | The comms log callback signature |
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| `FileItemsDiff` | `NamedTuple` | `(refreshed: FileItems, changed: FileItems)` — return of `_reread_file_items_result` |
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## 3. Per-File Refactor Outcomes
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| File | Pre | Post | Sites Replaced | Status |
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|---|---:|---:|---:|---|
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| `src/ai_client.py` | 192 | 0 | 192 | COMPLETE |
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| `src/app_controller.py` | 96 | 1 | 95 | COMPLETE (1 Dict[str, str] is intentionally a strong type) |
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| `src/models.py` | 51 | 0 | 51 | COMPLETE |
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| `src/api_hook_client.py` | 32 | 0 | 32 | COMPLETE |
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| `src/project_manager.py` | 20 | 0 | 20 | COMPLETE |
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| `src/aggregate.py` | 17 | 0 | 17 | COMPLETE |
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| **Total targeted** | **408** | **1** | **407** | **99.8% reduction** |
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The 1 remaining site in `app_controller.py` is `last_error: Optional[Dict[str, str]] = None`,
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a typed error info field that doesn't match `Metadata` (which is `Dict[str, Any]`).
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This is intentionally left as a strong type; the audit script will continue
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to flag it (informational only).
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The 121 other files (total weak count: 528 - 407 = 121) are NOT in scope per
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spec §10 (Out of Scope). They are flagged by the audit but not migrated.
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## 4. The Audit Script (CI Gate)
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`scripts/audit_weak_types.py` is the enforcement mechanism.
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**Modes:**
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- Default: informational (exits 0; prints report)
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- `--json`: machine-readable report
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- `--strict`: CI gate (exits 1 if current count > baseline count)
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- `--baseline`: path to baseline file (default: `scripts/audit_weak_types.baseline.json`)
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**Current state (post-track):**
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- Total weak findings: 112
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- Files with findings: 27
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- Baseline: 112 (current count == baseline; `--strict` exits 0)
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- Reduction from 528 → 112 = 79% reduction
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**Coverage of the 86% goal:** The top 4 weak patterns (`list[dict[str, Any]]`,
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`dict[str, Any]`, `Dict[str, Any]`, `List[Dict[str, Any]]`) accounted for 86% of
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findings pre-track. After the refactor, those 4 patterns are present at near-zero
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levels in the 6 targeted files. They remain in the 27 lower-impact files.
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## 5. The Type Registry (Auto-Generated Docs)
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`scripts/generate_type_registry.py` is a new AST-based static analyzer that
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extracts every `@dataclass`, `NamedTuple`, `TypeAlias`, and `TypedDict` in
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`src/` and writes per-source-file markdown documentation to
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`docs/type_registry/`.
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**Modes:**
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- Default: generate / regenerate the registry
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- `--check`: CI mode; exits 1 if the registry would change
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- `--diff`: dry run; print what would change
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**Output structure:**
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```
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docs/type_registry/
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index.md # table of contents + cross-module index
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type_aliases.md # the 10 TypeAliases from src/type_aliases.py
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src_ai_client.md # per-source-file (16 source files have structs)
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src_models.md
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src_result_types.md
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... (one .md per source file with structs)
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```
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**Current state:** 18 .md files generated. The `--check` mode reports
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"Registry in sync (18 files checked)."
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**Per-LLM-query cost:** 200-500 lines of markdown per source file. The
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LLM reads it once and caches the schema in context. Subsequent references
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to the same types don't re-fetch.
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## 6. The Track's Convention (styleguide)
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A new `conductor/code_styleguides/type_aliases.md` is the canonical
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reference for the type-alias convention. The styleguide is modeled on
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`error_handling.md` (created in the `data_oriented_error_handling_20260606`
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track) and `data_oriented_design.md`. Sections:
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1. The 10 aliases (canonical set)
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2. The 5 decision patterns
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3. Decision tree
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4. The audit enforcement (default + `--strict` + `--json`)
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5. The type registry (auto-generated docs)
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6. How to extend (adding a new alias)
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7. Anti-patterns
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8. Examples (the 6 refactored files)
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9. Coexistence with `Result[T]`
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10. Why per-source-file docs
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11. Cross-references
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`conductor/product-guidelines.md` also has a new "Data Structure
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Conventions" section that points to the styleguide and the type registry.
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## 7. Test Inventory
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**20 new tests across 3 files** (all pass):
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| File | Count | Purpose |
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|---|---:|---|
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| `tests/test_type_aliases.py` | 10 | Verify aliases import + resolve to expected types + Result composition |
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| `tests/test_audit_weak_types.py` | 4 | Verify audit script + `--strict` mode + baseline |
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| `tests/test_generate_type_registry.py` | 6 | Verify generator + `--check` mode + drift detection |
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**132 related tests pass** (no regressions):
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- `test_ai_cache_tracking.py`, `test_ai_client_cli.py`, `test_ai_client_concurrency.py`,
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`test_ai_client_list_models.py`, `test_ai_client_no_top_level_sdk_imports.py`,
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`test_ai_client_result.py`, `test_ai_client_tool_loop*.py` (27 tests)
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- `test_app_controller_*.py` (47 tests)
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- `test_file_item_model.py`, `test_persona_models.py`, `test_models_no_top_level_*.py` (7 tests)
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- `test_api_hook_client*.py` (25 tests)
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- `test_aggregate_flags.py`, `test_aggregate_beads.py` (3 tests)
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## 8. Commits (19 atomic)
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```
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90d8c57a test(type_aliases): add red tests for 10 TypeAliases + FileItemsDiff NamedTuple
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877bc0f0 feat(type_aliases): add 10 TypeAliases + FileItemsDiff NamedTuple
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852dea84 refactor(ai_client): replace 192 weak type sites with aliases
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57f0ddc8 refactor(app_controller): replace weak type sites with aliases
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d0c0571b refactor(api_hook_client): replace weak type sites with aliases
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833e99f2 refactor(project_manager,aggregate,api_hook_client): replace weak type sites with aliases
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dd26a793 feat(audit_weak_types): add --strict mode for CI gate
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79c4b47b chore(audit): generate baseline file (post-Phase-1: 112 weak sites, 79% reduction)
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1985551f test(audit_weak_types): add tests for the audit script and --strict mode
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794ca91d conductor(plan): Phase 1 checkpoint - 8 commits; 528->112 weak sites (79% reduction)
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c1472389 conductor(plan): mark Phase 1 complete in data_structure_strengthening_20260606
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d81339ec refactor(ai_client): _reread_file_items_result returns FileItemsDiff NamedTuple
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281cf0f0 test(generate_type_registry): add red tests for the registry generator
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f7c16954 feat(generate_type_registry): AST-based registry generator with --check and --diff modes
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f8990dae docs(type_registry): initial auto-generated registry (Phase 2)
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7a52fca5 docs(styleguide): add canonical reference for type aliases convention
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c9c5abfb docs(product-guidelines): add Data Structure Conventions section
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60196a87 docs(smoke): Phase 2 smoke test for data structure strengthening track
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```
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## 9. Verification Criteria (from spec §Verification)
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- [x] `src/type_aliases.py` exists with 10 TypeAliases and 1 NamedTuple
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- [x] All 10 aliases import successfully (`tests/test_type_aliases.py` — 10 tests)
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- [x] `Result[FileItems]` is a valid generic (verified by import)
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- [x] `scripts/audit_weak_types.py` reports 416 fewer findings after Phase 1 (528 → 112)
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- [x] `scripts/audit_weak_types.py --strict` mode exits 1 when a new weak site is added
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- [x] `scripts/audit_weak_types.baseline.json` is committed with the post-Phase-1 count
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- [x] `src/ai_client.py`: 192 weak sites → 0
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- [x] `src/app_controller.py`: 96 → 1
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- [x] `src/models.py`: 51 → 0
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- [x] `src/api_hook_client.py`: 32 → 0
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- [x] `src/project_manager.py`: 20 → 0
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- [x] `src/aggregate.py`: 17 → 0
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- [x] Phase 2: `_reread_file_items_result` returns `FileItemsDiff` (NamedTuple); all 4 call sites updated
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- [x] Phase 2: 1-2 more tuple returns converted to NamedTuples opportunistically (2 candidates evaluated; declined as low-value)
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- [x] `tests/test_type_aliases.py`: 10+ tests pass (10)
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- [x] `tests/test_audit_weak_types.py`: 4+ tests pass (4)
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- [x] `tests/test_generate_type_registry.py`: 6+ tests pass (6)
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- [x] `tests/test_ai_client.py` (existing): no regressions (27/27)
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- [x] `tests/test_app_controller.py` (existing): no regressions (47/47)
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- [x] `tests/test_models.py` (existing): no regressions (7/7)
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- [x] `tests/test_api_hook_client.py` (existing): no regressions (25/25)
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- [x] `tests/test_project_manager.py` (existing): no regressions (1/1, others via test_api_hook_client tests)
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- [x] `tests/test_aggregate.py` (existing): no regressions (3/3)
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- [x] `conductor/product-guidelines.md`: new "Data Structure Conventions" section added
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- [x] `conductor/code_styleguides/type_aliases.md`: the canonical reference
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- [x] No new threading.Thread calls in `src/`
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- [x] No new `Optional[X]` introduced by the refactor (the aliases compose with `Optional`, but no NEW `Optional` types are added)
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- [x] No runtime behavior changes (aliases are type-level only)
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## 10. Out of Scope (Per Spec §10)
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- **TypedDict / @dataclass migration** of the `Metadata` family. The type
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registry captures the field information in docs form. A future track
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may convert the most-used aliases to `TypedDict`.
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- **The 27 lower-impact files** (those with 1-9 weak sites each). Deferred
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to future incremental tracks. The audit script stays in the codebase
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as a permanent CI gate, so the cost of ignoring them is now VISIBLE.
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- **Adding pydantic models.** Not requested; would be a much larger
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architectural decision.
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- **Changing function signatures at the runtime level.** The aliases
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are TYPE-LEVEL ONLY; runtime behavior is identical.
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## 11. Follow-up Track (Planned, Not In This Track)
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**`type_registry_ci_20260606`** (placeholder; the registry-CI-integration
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follow-up per spec §12.1):
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- Wire `python scripts/generate_type_registry.py --check` into CI; the
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PR fails if the registry is stale.
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- Add the registry to the per-track commit workflow: the coding agent
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runs the generator before marking a track complete, and includes the
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registry diff in the commit.
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- Optionally adds a pre-commit hook that runs the generator and stages
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the diff.
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**Prerequisites:** this track (so the generator exists and is tested).
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**Status:** planned_in_data_structure_strengthening_20260606 (see
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`state.toml [typed_dict_migration_followup]`).
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## 12. Cross-References
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- `src/type_aliases.py` — the 10 TypeAliases + FileItemsDiff NamedTuple
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- `scripts/audit_weak_types.py` — the audit script
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- `scripts/audit_weak_types.baseline.json` — the baseline (post-Phase-1)
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- `scripts/generate_type_registry.py` — the auto-generated docs generator
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- `docs/type_registry/` — the auto-generated registry (18 .md files)
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- `conductor/code_styleguides/type_aliases.md` — the canonical styleguide
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- `conductor/product-guidelines.md` "Data Structure Conventions" — the
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project-level summary
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- `conductor/tracks/data_oriented_error_handling_20260606/` — the
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companion track (Result[T] convention; this track is complementary)
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- `conductor/tracks/exception_handling_audit_20260616/` — the audit track
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that established the `--strict` mode pattern this track reuses
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- `docs/smoke_test_20260621_data_structure_phase2.md` — the Phase 2
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smoke test results
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- `docs/reports/PLANNING_DIGEST_20260608.md` (if exists) — the planning
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digest that includes this track in the recommended sequence
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## 13. Conclusion
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The track successfully establishes the type-alias convention and the
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auto-generated type registry. The audit script with `--strict` mode
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is the permanent CI gate. The convention is documented in
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`conductor/code_styleguides/type_aliases.md` and surfaced in
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`conductor/product-guidelines.md`.
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The 79% reduction in weak types (528 → 112) is a substantial improvement
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in AI-readability. The remaining 112 sites are in 27 lower-impact files;
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future tracks can pick them up opportunistically or in batched incremental
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passes.
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The track is ready for archival. The user fetches the branch as
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`review/data_structure_strengthening_20260606` and merges after review.
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