6 phases, one per commit:
Phase 1: data structures (CallGraph, ExpensiveOp, StateMutation)
- 15 unit tests
Phase 2: trace_action + ActionProfile + cost model + AST walking
- 8 tests (synthetic + integration on real src/)
Phase 3: JSON / markdown / Mermaid output
- 4 tests
Phase 4: MCP tool + CLI surface
- 3 tests
Phase 5: run audit on 3 actions; commit report
Phase 6: tracks.md update
TDD pattern: each task has synthetic-data unit test, then
real implementation, then integration with real src/, then
commit. The state.toml scaffold is created in Phase 0 Step 0.1
and advanced after each phase.
3 actions in scope (MMA is cold per user):
- ai_message_lifecycle (5 entry points)
- discussion_save_load (4 entry points)
- gui_startup (3 entry points)
Two follow-up tracks recorded but NOT in this track:
- pipeline_runtime_profiling_20260607
- pipeline_pruning_20260607
No new pip dependencies; pure stdlib (ast, json, pathlib,
dataclasses). Read-only on src/; new files are the tool, the
tests, and the report under docs/reports/code_path_audit/2026-06-07/.
