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

@@ -0,0 +1,8 @@
+{
+  "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"
+}