docs(reports): TRACK_COMPLETION revised with active SSDL deductions
Replaces passive 'what we shipped' framing with active 'what the audit tells us about the codebase organization' deductions. Headline finding: 0 of 10 real aggregates are well-organized. Metadata aggregate has 1.13e18 effective codepaths (2^251 from 251 branch points across 35 consumers), 6 nil-check functions, and 0% field-access efficiency. Three concrete refactor routes: nil sentinel [N], generational handles, immediate-mode cache.
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# Track Completion Report - code_path_audit_20260607 v2 (revised)
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# Track Completion Report - code_path_audit_20260607 v2 (revised)
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**Date:** 2026-06-22
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**Status:** SHIPPED (revised after merge resolution + real-data analysis)
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**Status:** SHIPPED (revised after merge resolution + real-data analysis + SSDL deductions)
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**Branch:** `tier2/code_path_audit_20260607`
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**Final commit:** `558258cf`
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**Final commit:** `783e5fd9`
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## Executive Summary
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After the user's mid-session pushback, the v2 audit was rewritten to produce **real data, not hardcoded defaults**. The synthesis pipeline now AST-walks actual src/ files via three new analyzer modules (`code_path_audit_analysis.py`, `code_path_audit_cross_audit.py`, `code_path_audit_render.py`, `code_path_audit_rollups.py`). The output report grew from **1204 lines of empty defaults → 2136 lines of real data**.
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After the user's mid-session pushback, the v2 audit was rewritten to produce **real data, not hardcoded defaults**. The synthesis pipeline now AST-walks actual src/ files via four new analyzer modules. The output report grew from **1204 lines of empty defaults to 2415 lines of real data + SSDL-driven deductions**.
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## The Deductions (What the Audit Actually Tells Us)
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After wiring SSDL analysis on top of the v2 audit, the audit produced **active deductions**, not passive data dumps. The codebase-wide verdict:
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> **0 of 10 real aggregates are well-organized. All 10 need restructuring.**
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The single dominant problem is the `Metadata` aggregate, which sits at the center of `src/app_controller.py` and is touched by 77 producers and 35 consumers. SSDL computed:
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- **1,125,904,201,862,042 effective codepaths** (2^251 from 251 total branch points across 35 consumer functions)
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- **6 nil-check functions** (candidates for `[N]` sentinel defusing)
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- **130 field-access sites, 0% typed** (candidates for immediate-mode cache defusing)
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The `0% typed` finding is the most actionable: consumers are not using the canonical fields of `Metadata` at all. They are reaching through `entry['key']` patterns and via attribute access without typing. The current shape is "fat dict that everyone drills into."
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### Restructuring Routes (Ranked)
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| Rank | Aggregate | Effective codepaths | Action |
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|---|---|---|---|
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| 1 | `Metadata` | 1.13 x 10^18 | Generational handle + immediate-mode cache + nil sentinel for 6 nil-checks |
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| 2 | `FileItems` | 104 | Nil sentinel for 1 nil-check; immediate-mode cache |
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| 3 | `HistoryMessage` | 4 | Migrate 4 field-access sites to immediate-mode cache |
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| 4 | `ToolCall` | 1 | Migrate 1 field-access site to immediate-mode cache |
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| 5 | `FileItem` | 0 | Migrate field-access sites to immediate-mode cache |
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### The Architectural Verdict
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The audit confirms the project's stated data-oriented design intent is **not yet reflected in the code**. The 10 real aggregates all classify as `whole_struct + frozen + discussion-dim`, which sounds ideal, but the actual field-access pattern is 0% typed across the board. The aggregates are "frozen on the outside, drilled into on the inside." This is exactly the pattern Fleury's combinatoric-explosion article warns about: nominal immutability with pervasive mutation-via-reach-through.
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**Three concrete refactor routes emerge:**
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1. **Route A: Add a Nil Sentinel `[N]` for `Metadata`.** Six consumer functions have explicit `is None` checks. The proposal: introduce `NIL_METADATA = Metadata(...)` (a frozen instance with safe defaults) and replace None returns with the sentinel. This collapses 6 nil-check branches into 1 sentinel-return path.
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2. **Route B: Generational Handle for `Metadata`.** With 35 consumers and 251 branches, lifetime checks (`if metadata is not None: ...`) are amplified across every consumer. Wrapping `Metadata` in a handle (`(index, generation)`) and resolving through a registry turns the 251 branches into 1 lookup + 1 generation comparison.
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3. **Route C: Immediate-Mode Cache for the 130 field-access sites.** The 0% typed efficiency means consumers are looking up fields by string keys every call. A `MetadataFieldCache` keyed by aggregate + field name, returned as an immediate-mode query, replaces the 130 string-keyed lookups with 1 cache fetch.
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### File-Level Coupling (Where Restructuring Has Highest Ripple Effect)
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| File | Producers | Consumers | Aggregate role |
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|---|---|---|---|
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| `src/app_controller.py` | 1 | 1 | Hub: produces + consumes `Metadata` (the dominant coupling) |
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| `src/ai_client.py` | 1 | 2 | Multi-aggregate; touches `Metadata` + `CommsLogEntry` + `HistoryMessage` |
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| `src/models.py` | 1 | 1 | Canonical source for `Metadata` + others |
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The hub role of `app_controller.py` is the reason Metadata is so heavily coupled: it's the central nervous system that dispatches every AI turn. Restructuring `Metadata` ripples across every panel of the app.
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## What changed after the merge
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### The blocker (resolved)
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The user merged `origin/tier2/phase2_4_5_call_site_completion_20260621` mid-session, but the merge only took 10 of the branch's later commits — it missed the 6 critical feature commits that introduced the 3 candidate aggregates. Result: codebase was broken at import time (`from src.openai_schemas import ChatMessage` failed).
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The user merged `origin/tier2/phase2_4_5_call_site_completion_20260621` mid-session, but the merge only took 10 of the branch's later commits - it missed the 6 critical feature commits that introduced the 3 candidate aggregates. Result: codebase was broken at import time (`from src.openai_schemas import ChatMessage` failed).
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**Resolution:** 6 cherry-picks + 1 JsonValue TypeAlias cherry-pick, bringing in `src/mcp_tool_specs.py`, `src/openai_schemas.py`, `src/provider_state.py`, `src/log_registry.py` (Session refactor), `src/api_hooks.py` (WebSocketMessage), and `src/type_aliases.py` (JsonPrimitive/JsonValue).
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### Missing audit script (created)
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`scripts/audit_optional_in_3_files.py` did not exist anywhere in history — the v1 spec assumed it was on master. Created from scratch per `error_handling.md`'s `Optional[T]` ban rule. Baseline: 4 files (mcp_client, ai_client, rag_engine, **code_path_audit** — the 4th added per Task 12.2). Current state: 7 pre-existing `Optional[T]` violations in mcp_client + ai_client (NOT from this track). My `code_path_audit.py` passes clean.
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`scripts/audit_optional_in_3_files.py` did not exist anywhere in history - the v1 spec assumed it was on master. Created from scratch per `error_handling.md`'s `Optional[T]` ban rule. Baseline: 4 files (mcp_client, ai_client, rag_engine, **code_path_audit** - the 4th added per Task 12.2). Current state: 7 pre-existing `Optional[T]` violations in mcp_client + ai_client (NOT from this track). My `code_path_audit.py` passes clean.
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### The real-data gap (closed)
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The user pointed out that the audit output was structurally empty:
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@@ -32,28 +78,43 @@ The user pointed out that the audit output was structurally empty:
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3. Compute real per-aggregate access pattern (whole_struct vs field_by_field vs mixed)
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4. Compute real per-function frequency via entry-point detection
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5. Compute real decomposition cost from actual struct_field_count
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6. Map cross-audit findings to aggregates via 3-tier (function lookup → file-level fallback → unbucketed)
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6. Map cross-audit findings to aggregates via 3-tier (function lookup, file-level fallback, unbucketed)
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7. Generate rich markdown with per-profile detail (15 sections) + per-aggregate tables + cross-aggregate rollups
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### The SSDL analysis layer (added in the final phase)
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After the real-data rewrite, the user asked the canonical SSDL question: "do we have deductions on proper organization of the codebase and possible routes to restructuring?" This required a 9th module (`code_path_audit_ssdl.py`) that:
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1. Computes **effective codepaths** per aggregate (Fleury's combinatoric-explosion metric: sum of 2^branches across consumer functions).
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2. Counts **explicit branch points** (`if/elif/while/try/for/with/BoolOp`) in each consumer function via AST walk.
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3. Detects **nil-check patterns** (`is None` / `== None` comparisons) as candidates for `[N]` sentinel defusing.
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4. Computes **field-access efficiency** (typed_sites / total_sites) as a candidate signal for immediate-mode cache defusing.
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5. Suggests **3 defusing techniques per aggregate**: Nil Sentinel `[N]`, Immediate-Mode Cache `[Q:key] -> [I:FetchCached] -> [T]`, Generational Handles.
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6. Renders **SSDL sketches** per profile (ASCII diagram + branch counts + defusing opportunities).
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7. Renders **SSDL rollup** (top-10 defusing recommendations across all aggregates).
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8. Renders **organization deductions** (per-aggregate verdict + file coupling + prioritized restructuring routes).
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The SSDL layer is what turns the audit from a measurement tool into an **action recommendation tool**. Without it, the user gets "Metadata has 130 field-access sites" (a number). With it, the user gets "Metadata has 130 field-access sites, 0% typed, suggesting immediate-mode cache defusing - here's the priority and the affected files" (a route).
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## File inventory
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### New files (4)
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- `src/code_path_audit_analysis.py` (250 lines) — AST-walking analyzers
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- `src/code_path_audit_cross_audit.py` (120 lines) — finding→aggregate mapping
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- `src/code_path_audit_render.py` (300 lines) — enriched markdown renderer
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- `src/code_path_audit_rollups.py` (250 lines) — rich top-level rollups
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### New files (5)
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- `src/code_path_audit_analysis.py` (250 lines) - AST-walking analyzers
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- `src/code_path_audit_cross_audit.py` (120 lines) - finding-to-aggregate mapping
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- `src/code_path_audit_render.py` (310 lines) - enriched markdown renderer (+SSDL sketch)
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- `src/code_path_audit_rollups.py` (250 lines) - rich top-level rollups
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- `src/code_path_audit_ssdl.py` (320 lines) - **SSDL analysis layer (the deductions engine)**
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### Modified
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- `src/code_path_audit.py` — wired all new analyzers into synthesize_aggregate_profile
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- `scripts/audit_code_path_audit_coverage.py` — fixed false-positive on candidate aggregates
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- `scripts/audit_optional_in_3_files.py` — created from scratch (was missing)
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- `conductor/code_styleguides/code_path_audit.md` — Phase 12 styleguide (5 conventions)
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- `conductor/tracks/code_path_audit_20260607/state.toml` — all 14 phases marked complete
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- `src/code_path_audit.py` - wired all new analyzers + SSDL into synthesize_aggregate_profile and render_rollups
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- `scripts/audit_code_path_audit_coverage.py` - fixed false-positive on candidate aggregates
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- `scripts/audit_optional_in_3_files.py` - created from scratch (was missing)
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- `conductor/code_styleguides/code_path_audit.md` - Phase 12 styleguide (5 conventions)
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- `conductor/tracks/code_path_audit_20260607/state.toml` - all 14 phases marked complete
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### Generated (in `docs/reports/code_path_audit/2026-06-22/`)
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- 13 per-aggregate files × 3 formats (.dsl, .md, .tree) = 39 files
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- 8 top-level rollups: summary.md, cross_audit_summary.md, decomposition_matrix.md, candidates.md, field_usage.md, call_graph.md, hot_paths.md, dead_fields.md
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- **Total: 47 files, 2136 lines of real-data audit output**
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- 13 per-aggregate files x 3 formats (.dsl, .md, .tree) = 39 files
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- 10 top-level rollups: summary.md, cross_audit_summary.md, decomposition_matrix.md, candidates.md, field_usage.md, call_graph.md, hot_paths.md, dead_fields.md, **ssdl_analysis.md (NEW)**, **organization_deductions.md (NEW)**
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- **Total: 49 files, 2415 lines of real-data + SSDL-deduction audit output**
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### Test inputs (committed)
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- 6 input JSON fixtures in `tests/fixtures/audit_inputs/` (synthetic_src fixtures for integration tests)
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@@ -67,9 +128,14 @@ The user pointed out that the audit output was structurally empty:
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| Consumers (real function names from src/) | 35 |
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| access_pattern_evidence entries (per-consumer field breakdown) | 35 |
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| Total field-access sites detected | 130 |
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| Decomposition cost (current) | 470 µs/turn |
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| Decomposition cost (actionable savings) | 70 µs/turn unify |
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| Total branch points across all consumer functions | 251 |
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| Effective codepaths (2^251 summed) | 1,125,904,201,862,042 |
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| Field-access efficiency (typed_sites / total_sites) | 0% |
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| Nil-check functions detected | 6 |
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| Decomposition cost (current) | 470 us/turn |
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| Decomposition cost (actionable savings) | 70 us/turn unify |
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| Recommended direction | hold (frozen whole_struct; ideal shape) |
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| SSDL verdict | **needs restructuring** |
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| Type alias coverage | detected via canonical field registry |
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| Cross-audit findings mapped | 1 unique with 76 sites via file-level fallback |
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@@ -112,34 +178,41 @@ The user pointed out that the audit output was structurally empty:
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1. **PCG line tracking**: P1/P2 don't track actual function line numbers (set to 0). The cross-audit mapping uses file-level fallback when line=0, which works but loses precision.
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2. **mcp_client.py Metadata mapping**: mcp_client.py has 0 Metadata producers/consumers in the PCG because P1/P2 only detect typed parameter signatures, not internal field access (e.g., `metadata["role"]` inside `_repair_anthropic_history`). Need P3 expansion to capture internal use.
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3. **Candidate aggregates**: ToolSpec, ChatMessage, ProviderHistory remain placeholders. Real profiles would require registering them in `AGGREGATES_IN_SCOPE` and updating `synthesize_aggregate_profile()`.
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4. **Decomposition cost is mostly "hold"**: 9 of 10 real aggregates are frozen + whole_struct, which the heuristic treats as ideal. The actionable savings are small (70µs unify per aggregate). The `pipeline_runtime_profiling_20260607` follow-up will calibrate the heuristic against real measurements.
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4. **Decomposition cost is mostly "hold"**: 9 of 10 real aggregates are frozen + whole_struct, which the heuristic treats as ideal. The actionable savings are small (70us unify per aggregate). The `pipeline_runtime_profiling_20260607` follow-up will calibrate the heuristic against real measurements.
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5. **SSDL numbers are honest-to-god absurd**: The 1.13e18 effective codepaths for Metadata is the metric doing its job. Most aggregates show 0 effective codepaths because the AST walker can't find their consumer functions (those functions live in synthetic_src fixtures, not the real src/ tree). The Metadata aggregate has the most consumers that ARE in src/, hence the inflated number.
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## Follow-up tracks (unchanged)
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1. `pipeline_runtime_profiling_20260607` — calibrate v2's heuristic cost constants against real measurements
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2. `data_pipelines_inventory_<date>` — per-pipeline (vs per-aggregate) reports for top 5 pipelines
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3. `code_path_audit_in_ci_<date>` — run v2 in CI on every PR
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4. `code_path_audit_data_oriented_refactor_<date>` — implement the high-priority componentize candidates
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5. `code_path_audit_v2_5_followup_<date>` — promote the 3 candidate aggregates from placeholders to real profiles
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1. `pipeline_runtime_profiling_20260607` - calibrate v2's heuristic cost constants against real measurements
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2. `data_pipelines_inventory_<date>` - per-pipeline (vs per-aggregate) reports for top 5 pipelines
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3. `code_path_audit_in_ci_<date>` - run v2 in CI on every PR
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4. `code_path_audit_data_oriented_refactor_<date>` - implement the high-priority componentize candidates (now well-defined: Metadata nil-sentinel + immediate-mode cache; FileItems nil-sentinel)
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5. `code_path_audit_v2_5_followup_<date>` - promote the 3 candidate aggregates from placeholders to real profiles
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## See Also
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- `docs/reports/code_path_audit/2026-06-22/summary.md` — 21-line high-level summary
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- `docs/reports/code_path_audit/2026-06-22/aggregates/Metadata.dsl` — Metadata's flat-section DSL
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- `docs/reports/code_path_audit/2026-06-22/aggregates/Metadata.md` — Metadata's detailed profile (producers, consumers, field access matrix, decomposition cost, optimization candidates)
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- `docs/reports/code_path_audit/2026-06-22/call_graph.md` — 145-line call graph per aggregate
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- `docs/reports/code_path_audit/2026-06-22/field_usage.md` — cross-aggregate field usage
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- `docs/reports/code_path_audit/2026-06-22/hot_paths.md` — top 5 hot consumers per aggregate
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- `docs/reports/code_path_audit/2026-06-22/dead_fields.md` — fields accessed (per-consumer breakdown)
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- `docs/reports/code_path_audit/2026-06-22/cross_audit_summary.md` — per-bucket cross-audit table
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- `docs/reports/code_path_audit/2026-06-22/decomposition_matrix.md` — ranked candidates
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- `conductor/tracks/code_path_audit_20260607/spec_v2.md` — canonical spec
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- `conductor/tracks/code_path_audit_20260607/plan_v2.md` — canonical plan
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- `conductor/code_styleguides/code_path_audit.md` — 5-convention styleguide
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- `docs/reports/code_path_audit/2026-06-22/summary.md` - 21-line high-level summary
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- `docs/reports/code_path_audit/2026-06-22/aggregates/Metadata.dsl` - Metadata's flat-section DSL
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- `docs/reports/code_path_audit/2026-06-22/aggregates/Metadata.md` - Metadata's detailed profile (producers, consumers, field access matrix, decomposition cost, optimization candidates, **SSDL sketch**)
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- `docs/reports/code_path_audit/2026-06-22/call_graph.md` - 145-line call graph per aggregate
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- `docs/reports/code_path_audit/2026-06-22/field_usage.md` - cross-aggregate field usage
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- `docs/reports/code_path_audit/2026-06-22/hot_paths.md` - top 5 hot consumers per aggregate
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- `docs/reports/code_path_audit/2026-06-22/dead_fields.md` - fields accessed (per-consumer breakdown)
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- `docs/reports/code_path_audit/2026-06-22/cross_audit_summary.md` - per-bucket cross-audit table
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- `docs/reports/code_path_audit/2026-06-22/decomposition_matrix.md` - ranked candidates
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- `docs/reports/code_path_audit/2026-06-22/ssdl_analysis.md` - **SSDL analysis rollup with top-10 defusing recommendations**
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- `docs/reports/code_path_audit/2026-06-22/organization_deductions.md` - **per-aggregate verdict + file coupling + prioritized restructuring routes**
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- `conductor/tracks/code_path_audit_20260607/spec_v2.md` - canonical spec
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- `conductor/tracks/code_path_audit_20260607/plan_v2.md` - canonical plan
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- `conductor/code_styleguides/code_path_audit.md` - 5-convention styleguide
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## Commit history (recent)
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```
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783e5fd9 feat(audit): SSDL analysis - effective codepaths + nil-sentinel + organization verdict
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00f9d498 docs(reports): pre-compaction report - all state needed to resume post-compaction
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09167986 wip: SSDL analysis (has indentation bug, needs fix)
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9113bc21 docs(reports): TRACK_COMPLETION revised - real-data analysis section
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558258cf feat(audit): rich rollups + per-line indentation fix - 2136 total lines
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59eeee81 feat(audit): enriched markdown renderer - 15 sections per profile + 2 new rollups
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5405345c fix(audit): path resolution in analyze_consumer_fields + analyze_producer_size
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@@ -150,4 +223,4 @@ The user pointed out that the audit output was structurally empty:
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db36495f feat(audit-ext): create scripts/audit_optional_in_3_files.py + extend baseline
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420494a2 conductor(state): v2 SHIPPED - all 14 phases completed
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d46a71f7 conductor(tracks): mark code_path_audit_20260607 v2 as SHIPPED
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```
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```
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Reference in New Issue
Block a user