docs: Reorder track queue and initialize final stabilization tracks

- Initialize asyncio_decoupling_refactor_20260306 track

- Initialize mock_provider_hardening_20260305 track

- Initialize simulation_fidelity_enhancement_20260305 track

- Update TASKS.md and tracks.md to reflect new strict execution queue

- Archive completed tracks and remove deprecated test performance track

conductor/tracks/mock_provider_hardening_20260305/metadata.json

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+{
+  "id": "mock_provider_hardening_20260305",
+  "title": "Mock Provider Hardening",
+  "description": "Introduce negative testing paths (malformed JSON, timeouts) into the mock AI provider.",
+  "status": "planned",
+  "created_at": "2026-03-05T00:00:00Z",
+  "updated_at": "2026-03-05T00:00:00Z"
+}

conductor/tracks/mock_provider_hardening_20260305/plan.md

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+# Implementation Plan: Mock Provider Hardening (mock_provider_hardening_20260305)
+
+## Phase 1: Mock Script Extension
+- [ ] Task: Initialize MMA Environment `activate_skill mma-orchestrator`
+- [ ] Task: Add `MOCK_MODE` to `mock_gemini_cli.py`
+    - [ ] WHERE: `tests/mock_gemini_cli.py`
+    - [ ] WHAT: Implement conditional branches based on `MOCK_MODE` environment variable.
+    - [ ] HOW: Support `success`, `malformed_json`, `error_result`, and `timeout`.
+    - [ ] SAFETY: Ensure it still defaults to `success` to not break existing tests.
+- [ ] Task: Conductor - User Manual Verification 'Phase 1: Mock Extension'
+
+## Phase 2: Negative Path Testing
+- [ ] Task: Write `test_negative_flows.py`
+    - [ ] WHERE: `tests/test_negative_flows.py`
+    - [ ] WHAT: Write tests that launch `live_gui`, inject `MOCK_MODE` via `ApiHookClient` custom callback or `env` dictionary, and assert the UI gracefully handles the failure.
+    - [ ] HOW: Use `wait_for_event('response')` and check that the payload status is `"error"`.
+    - [ ] SAFETY: Ensure `timeout` tests don't actually hang the test suite for 120s (configure the timeout shorter if possible in test setup).
+- [ ] Task: Conductor - User Manual Verification 'Phase 2: Negative Tests'
+
+## Phase 3: Final Validation
+- [ ] Task: Full Suite Validation
+    - [ ] WHERE: Project root
+    - [ ] WHAT: `uv run pytest`
+    - [ ] HOW: Ensure 100% pass rate.
+    - [ ] SAFETY: None.
+- [ ] Task: Conductor - User Manual Verification 'Phase 3: Final Validation'

conductor/tracks/mock_provider_hardening_20260305/spec.md

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+# Specification: Mock Provider Hardening
+
+## Background
+The current `mock_gemini_cli.py` provider only tests the "happy path". It always returns successfully parsed JSON-L responses, which masks potential error-handling bugs in `ai_client.py` and `AppController`. To properly verify the system's robustness, the mock must be capable of failing realistically.
+
+## Objective
+Extend `mock_gemini_cli.py` to support negative testing paths, controlled via an environment variable `MOCK_MODE`.
+
+## Requirements
+1. **MOCK_MODE parsing:** The mock script must read `os.environ.get("MOCK_MODE", "success")`.
+2. **malformed_json:** If mode is `malformed_json`, the mock should print a truncated or syntactically invalid JSON string to `stdout` and exit.
+3. **error_result:** If mode is `error_result`, the mock should print a valid JSON string but with `"status": "error"` and an error message payload.
+4. **timeout:** If mode is `timeout`, the mock should `time.sleep(120)` to force the parent process to handle a subprocess timeout.
+5. **Integration Tests:** New tests must be written to explicitly trigger these modes using `ApiHookClient` and verify that the GUI displays an error state rather than crashing.