conductor(track-update): code_path_audit_20260607 - post-4-tracks timing + 5-source framing

The user specified that the code_path_audit_20260607 track should run
AFTER the 4 foundational tracks complete (qwen_llama_grok,
data_oriented_error_handling, data_structure_strengthening,
mcp_architecture_refactor). This commit formalizes that timing
and grounds the audit's analytical framing in the 5 sources loaded
into context on 2026-06-08.

3 surgical additions to the spec/plan, no task changes:

1. Post-4-tracks timing (new section in spec.md §"Timing", plus
   a "Timing" callout in plan.md's opening):
   - The 4 tracks will significantly reshape src/ai_client.py,
     src/mcp_client.py, src/app_controller.py, and
     src/type_aliases.py
   - Running the audit on pre-refactor code would produce a
     report that's stale on day 1
   - The post-4-tracks timing ensures the audit grounds
     optimization decisions for the *resulting* architecture
   - Pre-flight check: verify all 4 tracks are [x] completed
     in conductor/tracks.md before starting this track

2. Analytical framing (new section in spec.md §"Analytical Framing
   (5-source lens)"):
   - Maps each of the 5 sources (Fleury taxonomy + Fleury
     combinatoric + Muratori Big OOPs + Reece Assuming + user's
     chunk ideation) to specific audit-time heuristics
   - 4 concrete heuristics: effective-codepath count,
     entity-hierarchy fingerprint, assumed-too-much detector,
     chunkification candidates
   - The heuristics shape REPORT INTERPRETATION, not the
     static cost model (which stays data-grounded in
     EXPENSIVE_THRESHOLD + per-class weights)

3. See Also cross-references in spec.md (6 new entries):
   - nagent_review Pitfalls #2 and #4 (provider history
     globals + stateful singleton)
   - wo84LFzx5nI Big OOPs transcript (full text, 4310
     segments, 200KB; loaded 2026-06-08)
   - i-h95QIGchY Assuming transcript (full text, 3719
     segments, 162KB; loaded 2026-06-08)
   - ed_chunk_data_structures_20260523.md (5-image archive
     of user's chunk ideation, 19KB; saved 2026-06-08)
   - computational_shapes_ssdl_digest_20260608.md (the SSDL
     digest that synthesizes the 4-source computational-shapes
     thinking; the audit's tree/mermaid outputs ARE
     computational-shape visualizations)

4. tracks.md entry updated to include the spec/plan links and
   a brief status note that the audit is post-4-tracks.

5. plan.md has a "Timing" callout at the top stating the 4
   tracks must ship before the plan executes.

No code modified. The audit's tasks (Phases 1-6) are unchanged
in structure; the new sections only add analytical context
and timing constraints.

conductor/tracks.md

@@ -533,7 +533,8 @@ User review surfaced five outstanding UI issues, each previously attempted witho
 *Link: [./tracks/test_batching_post_refactor_polish_20260607/](./tracks/test_batching_post_refactor_polish_20260607/)*
 
 #### Track: Code Path Audit
-*Link: [./tracks/code_path_audit_20260607/](./tracks/code_path_audit_20260607/)*
+*Link: [./tracks/code_path_audit_20260607/](./tracks/code_path_audit_20260607/), Spec: [./tracks/code_path_audit_20260607/spec.md](./tracks/code_path_audit_20260607/spec.md), Plan: [./tracks/code_path_audit_20260607/plan.md](./tracks/code_path_audit_20260607/plan.md) (to be authored by writing-plans skill)*
+*Goal: Build `src/code_path_audit.py` — a static-analysis tool that audits the 3 major actions (AI message lifecycle, discussion save/load, GUI startup) for expensive operations, redundant calls, and pipelining candidates. Output: custom postfix `.dsl` data + markdown + Mermaid + prefix tree text under `docs/reports/code_path_audit/<date>/`. The follow-up `pipeline_pruning_20260607` consumes the `.dsl` files; the markdown + tree are for human review. MMA worker spawn is **cold per user**. **Timing (revised 2026-06-08):** the audit must run *after* the 4 foundational tracks ship (`qwen_llama_grok`, `data_oriented_error_handling`, `data_structure_strengthening`, `mcp_architecture_refactor`); pre-4-tracks code is too stale to ground optimization decisions.*
 
 #### Track: GUI Architecture Refinement
 *Link: [./tracks/gui_architecture_refinement_20260512/](./tracks/gui_architecture_refinement_20260512/) (no spec.md; needs scoping before planning)*