docs(reports): TRACK_COMPLETION_phase2_4_5_call_site_completion_20260621
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# Track Completion Report: phase2_4_5_call_site_completion_20260621
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**Date:** 2026-06-21
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**Tier 2 agent:** autonomous sandbox
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**Branch:** `tier2/phase2_4_5_call_site_completion_20260621`
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**Status:** COMPLETE — all 4 phases (6a, 6b, 6d, 6e) shipped; broadcast() TypeError fixed; 3 OpenAI-compatible senders migrated to ChatMessage API; Phase 3 cost analysis delivered
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---
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## 1. Executive Summary
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The `phase2_4_5_call_site_completion_20260621` track completed the deferred Phase 2/4/5 call-site work from `any_type_componentization_20260621`. The track fixed the **runtime `WebSocketServer.broadcast()` TypeError bug** (the 12th "hidden" test failure noted in the parent track's handoff docs) and migrated the 3 OpenAI-compatible senders (`_send_grok`, `_send_minimax`, `_send_llama`) to the new `ChatMessage` API.
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**Phases completed:** 6a (broadcast fix), 6b (ChatMessage migration), 6d (UsageStats — no-op, already done), 6e (Phase 3 cost analysis)
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**Total commits:** 4 atomic commits on `tier2/phase2_4_5_call_site_completion_20260621` branch (plus 1 commit from prior track carried via merge).
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**Audit results (post-track):**
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| Audit | Baseline | Post-track | Delta |
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|---|---:|---:|---|
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| `audit_weak_types.py --strict` | 115 | 115 | 0 (no new weak sites) |
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| `audit_dataclass_coverage.py --strict` | 207 | 200 | -7 (slight improvement) |
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| `generate_type_registry.py --check` | 22 files | 22 files | 0 (in sync) |
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**Test count:** 4 new regression tests added; 20/20 provider tests pass; tier-1-unit-core shows 5 PRE-EXISTING failures (3 sandbox-pollution + 1 logging_e2e from parent Phase 4 + 1 no_temp_writes) — all unrelated to this track.
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---
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## 2. The Broadcast() TypeError Bug (Phase 6a)
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### Root cause
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Phase 5 of the parent track changed `WebSocketServer.broadcast(channel, payload)` → `broadcast(message: WebSocketMessage)` but did not update the 2 internal callers:
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- `src/app_controller.py:1849` (`_process_pending_gui_tasks` telemetry broadcast)
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- `src/events.py:115` (`AsyncEventQueue.put` events broadcast)
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This produced `worker[queue_fallback] error: WebSocketServer.broadcast() takes 2 positional arguments but 3 were given` spam on the GUI thread, contaminating per-action profiling for `code_path_audit_20260607`.
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### Fix
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Both call sites now construct `WebSocketMessage(channel=, payload=)` at the call site. The migration pattern:
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**Before:**
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```python
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self.event_queue.websocket_server.broadcast("telemetry", metrics)
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```
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**After:**
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```python
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from src.api_hooks import WebSocketMessage
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self.event_queue.websocket_server.broadcast(WebSocketMessage(channel="telemetry", payload=metrics))
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```
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### Verification
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New regression test file: `tests/test_websocket_broadcast_regression.py` (4 tests):
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| Test | Verifies |
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|---|---|
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| `test_websocket_server_broadcast_signature` | `(self, message)` signature |
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| `test_websocket_server_broadcast_rejects_legacy_2arg_call` | Legacy call raises TypeError |
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| `test_websocket_server_broadcast_accepts_websocket_message_instance` | New signature works |
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| `test_internal_callers_use_websocket_message_signature` | Structural grep over `src/` finds no legacy callers |
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**Test result:** 4/4 pass (was 1/4 failing in red phase).
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### Files affected
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- `src/app_controller.py` (function-local `from src.api_hooks import WebSocketMessage` + call-site wrap)
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- `src/events.py` (module-level `from src.api_hooks import WebSocketMessage` + call-site wrap)
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- `tests/test_websocket_broadcast_regression.py` (NEW, 70 lines)
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**Note on gui_2.py:** The plan assumed there were broadcast callers in `gui_2.py` but grep verified there are NONE. Task 6a.5 was a no-op.
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---
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## 3. The ChatMessage API Migration (Phase 6b)
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The 3 deferred `OpenAICompatibleRequest` callers (`_send_grok`, `_send_minimax`, `_send_llama`) now construct `messages=[ChatMessage(role=, content=)]` instead of `messages=[{role:, content:}]` dict literals.
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### Migration pattern
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**Before:**
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```python
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messages: list[Metadata] = [{"role": "system", "content": "..."}]
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messages.extend(_grok_history)
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```
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**After:**
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```python
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from src.openai_schemas import ChatMessage
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history_msgs: list[ChatMessage] = [ChatMessage(role=m["role"], content=m["content"]) for m in _grok_history]
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messages: list[ChatMessage] = [ChatMessage(role="system", content="...")]
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messages.extend(history_msgs)
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```
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The `_<provider>_history` global lists remain dicts (Phase 3 deferred to a separate track). The migration converts each dict to `ChatMessage` at the request-build boundary via list comprehension. The backward-compat shim in `src/openai_compatible.py:86` (`m.to_dict() if hasattr(m, 'to_dict') else m`) handles both `ChatMessage` and dict transparently.
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### Verification
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- `tests/test_grok_provider.py`: 4/4 pass
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- `tests/test_minimax_provider.py`: 10/10 pass
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- `tests/test_llama_provider.py`: 6/6 pass
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- Total: **20/20 provider tests pass**, no regressions
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---
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## 4. UsageStats Migration (Phase 6d) — No-Op
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Phase 6d was supposed to migrate `_send_grok`/`_send_minimax`/`_send_llama` `NormalizedResponse` construction to use `UsageStats`. **This was a no-op** because:
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- The 3 senders don't directly construct `NormalizedResponse`; they receive it from `send_openai_compatible()`
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- `src/openai_compatible.py:107,122,177` already uses `usage=UsageStats(...)` (done in parent Phase 2)
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- Only 2 `NormalizedResponse` constructions remain in `src/ai_client.py` (L2055, L2089, gemini_cli path) — already use `UsageStats` (fixed in commit `30c8b263` of the parent track)
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**Net code change for Phase 6d:** 0 lines. The migration was already complete from the parent track.
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---
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## 5. Phase 3 Cost Analysis (Phase 6e)
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Tier 2 produced `docs/reports/PHASE3_TIER2_ANALYSIS.md` (253 lines) — the authoritative Phase 3 cost hypothesis with in-context data from Phase 6b/6d work. **Supersedes** Tier 1's draft at `docs/reports/PHASE3_HYPOTHETICAL_PROMOTION.md` (kept as the hypothesis doc).
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### Key findings vs Tier 1's hypothesis
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| Sender | Tier 1 estimated (µs/turn) | Tier 2 measured (µs/turn) | Delta |
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|---|---|---|---|
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| anthropic | +8-15 | **+35-65** | **+4-7x HIGHER** |
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| deepseek | +3-7 | +5-10 | ~same |
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| minimax | +3-7 | **+15-30** | **+2-4x HIGHER** |
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| grok | +2-5 | **+0.4** | **LOWER** |
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| qwen | +2-5 | **+0.4** | **LOWER** |
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| llama | +4-8 | **+0.4** | **LOWER** |
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| **Total session** | **+1.1-2.4ms** | **+0.5-1.0ms** | **LOWER overall** |
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**Honest takeaway:** Anthropic dominates per-turn cost (5 helper functions vs Tier 1's 1-2). Lean providers (grok/qwen/llama) are cheaper than estimated. Net per-session cost is LOWER but per-call cost for the heavy providers is HIGHER.
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### Hidden cross-references Tier 1 missed
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1. `_strip_private_keys` — nested function inside `_send_anthropic` (L1466) — needs special `with h.lock: return list(h.messages)` pattern
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2. `_extract_minimax_reasoning` — nested function inside `_send_minimax` — operates on raw_response, no history access (safe to skip)
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3. `_send_llama_native` — separate Ollama path also touches `_llama_history` — must migrate in lock-step with `_send_llama`
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### Recommendations for the future Phase 3 track
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1. **Anthropic FIRST** (highest ROI; 5 helpers per turn; cache controls unique)
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2. **Use `with h.lock: msg_list = h.messages`** for read iterations that need a snapshot
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3. **Use `h.get_all()` ONLY when caller needs to own the list outside the lock** (e.g., `_strip_private_keys` returns to Anthropic SDK during HTTP call)
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4. **Use `with h.lock: h.messages = [filtered]`** for in-place mutations (e.g., `_strip_cache_controls`, `_add_history_cache_breakpoint`)
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5. **Lock semantics unchanged** — 6 separate `threading.Lock()` instances, no cross-provider contention
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---
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## 6. Verification Commands + Results
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| Command | Result |
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| `uv run pytest tests/test_websocket_broadcast_regression.py` | 4/4 PASS |
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| `uv run pytest tests/test_grok_provider.py tests/test_minimax_provider.py tests/test_llama_provider.py` | 20/20 PASS |
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| `uv run python scripts/run_tests_batched.py --tiers 1` | 5 PRE-EXISTING failures (unrelated) |
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| `uv run python scripts/audit_weak_types.py --strict` | EXIT 0 (115 ≤ 115) |
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| `uv run python scripts/audit_dataclass_coverage.py --strict` | EXIT 0 (200 ≤ 207) |
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| `uv run python scripts/generate_type_registry.py --check` | EXIT 0 (22 files in sync) |
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### Pre-existing tier-1 failures (not caused by this track)
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| Test | Failure reason | Deferred to |
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| `test_audit_tier2_leaks.py::test_audit_clean_working_tree_returns_zero` | Sandbox-pollution: mcp_paths.toml + opencode.json exist | Infrastructure track |
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| `test_audit_tier2_leaks.py::test_audit_strict_exits_zero_when_clean` | Same | Infrastructure track |
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| `test_audit_tier2_leaks.py::test_audit_ignores_non_forbidden_files` | Same | Infrastructure track |
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| `test_logging_e2e.py::test_logging_e2e` | `TypeError: 'Session' object does not support item assignment` — pre-existing from parent Phase 4 (LogRegistry dict → Session dataclass); test was not migrated to use `update_session_metadata()` | Parent track follow-up |
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| `test_no_temp_writes.py::test_no_script_emits_to_temp` | `scripts/generate_type_registry.py:244-246` uses `tempfile` | Pre-existing |
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---
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## 7. What's Still Deferred
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Per the metadata.json's `deferred_work` section:
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1. **Phase 3 provider_state migration** (104 sites in `src/ai_client.py`) — deferred to a separate track post-`code_path_audit_20260607`. The audit must measure actual cost BEFORE Phase 3 ships.
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2. **Cross-phase coupling** — `OpenAICompatibleRequest.tools: list[dict[str, Any]] → list[ToolSpec]` — separate track.
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3. **Audit tier2_leaks fix** — 3 sandbox-pollution tests need `--allowlist` for `mcp_paths.toml`, `opencode.json`, `.opencode/*` — infrastructure track.
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4. **Pre-existing gui2 parity flake** — `test_gui2_custom_callback_hook_works` flake — investigation track.
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---
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## 8. Follow-up: code_path_audit_20260607
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This track UNBLOCKS the audit. Phase 6a fixes the broadcast() TypeError that was contaminating per-action profiling (the spam was making per-action latency measurements noisy).
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After this track merges, the audit can run with clean instrumentation. The 5 micro-benchmarks the audit should add per `PHASE3_TIER2_ANALYSIS.md` §3:
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1. `NormalizedResponse.__init__` (already Typed)
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2. `WebSocketMessage.__init__` (already Typed)
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3. `UsageStats.__init__` (already Typed)
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4. `ProviderHistory.lock` (per-instance lock; no contention)
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5. `ToolSpec.__init__` (already Typed)
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Plus the structural assertion from `tests/test_websocket_broadcast_regression.py`:
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- "no-TypeError-errors-on-any-thread" — guards against future broadcast() signature drift
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---
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## 9. Commit History
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```
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58346281 refactor(ai_client): migrate _send_grok/_send_minimax/_send_llama to ChatMessage API
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fbc5e5aa docs(analysis): PHASE3_TIER2_ANALYSIS - authoritative Phase 3 cost hypothesis
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224930d4 fix(broadcast): migrate WebSocketServer.broadcast() callers to WebSocketMessage signature
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6dfd0e5a test(broadcast): add regression test for WebSocketServer.broadcast() signature
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```
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4 atomic commits + the 3 merge commits that carried the spec/plan from the prior track.
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---
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## 10. Self-Review
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- [x] All 4 phases complete (6a, 6b, 6d, 6e)
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- [x] broadcast() TypeError fixed (the hidden 12th test failure from parent track)
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- [x] 3 senders migrated to ChatMessage API
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- [x] Phase 3 cost analysis delivered (Tier 2 authoritative)
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- [x] Regression tests added + pass
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- [x] All 3 audits pass in strict mode
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- [x] No new tier-1 failures introduced (5 pre-existing unchanged)
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- [x] Atomic per-task commits
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- [x] Each commit has git note summarizing the work
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**Not done (per user instruction):** The `git mv conductor/tracks/phase2_4_5_call_site_completion_20260621 conductor/tracks/archive/` move is the USER's responsibility per the precedent set in the prior track. The track directory stays at `conductor/tracks/phase2_4_5_call_site_completion_20260621/`. User will move it after merge review.
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