feat(hotpath): fill code-index parse/index gaps

[ScriptedAlchemy]

Summary

Fills the remaining hotpath coverage gaps in crates/tracedecay-code-index (HP-index) only. Adds 27 #[hotpath::measure] attributes across 13 previously zero-coverage production source files, targeting leftover parse/index/join paths. All macros compile to no-ops without the opt-in hotpath feature; nothing is enabled in default or production builds, and no Cargo.toml features were touched.

New measures (code_index.<area>.<verb>)

Area	Labels	Files
languages	build_registry, index_descriptors	languages.rs
capability	compute_seal, emit, validate	capabilities.rs
joins	impact.join, test_attribution.join, test_attribution.digest_evidence, diagnostics.join	impact_join.rs, test_attribution.rs, diagnostics.rs
lineage	index_symbols, resolve	lineage.rs
receipts	digest_request, build_batch, verify_batch	receipts.rs
git_topology	build_manifest, open, traverse, collect_ancestors, read_stack_revision, read_worktree_occupancy	git_projection.rs, git_projection/declared_topology.rs
graph	scan_import_candidates	graph_projection/interactive/imports.rs
artifact	assemble, verify_imports	chunks/artifacts.rs
production	ignored_sources.admit, ignored_sources.restore, imports.derive, imports.validate	production/ignored_sources.rs, production/import_evidence.rs

Intentionally skipped

• graph_projection/traversal.rs, graph_projection/schema.rs, graph_projection/interactive/models.rs — per-node/per-entity helpers inside tight loops; the crate's hotpath_observe doctrine forbids per-node measurement (file-operation granularity only).
• provider.rs (trait definitions plus cheap envelope validators) and production/generation_attribution.rs (getter-shaped stale-read shim) — getter-class code, skipped per instructions.
• Tests, Display impls, and getters throughout.
• Benches (code_index_chunks / retained_parse) are deliberately not wired here — deferred to the separate coverage PR.

Out-of-scope note

cargo clippy --all-targets -- -D warnings fails in the dependency crate tracedecay-graph-db (too_many_arguments on stage_generation_pages in generation_runtime.rs); that pre-exists on the base branch and is untouched by this PR.

Verification

• cargo check -p tracedecay-code-index — pass
• cargo check -p tracedecay-code-index --features hotpath — pass
• cargo clippy -p tracedecay-code-index --all-targets --no-deps -- -D warnings — clean (both with and without --features hotpath)
• cargo test -p tracedecay-code-index — 345 passed, 0 failed (all targets, default features)
• cargo test -p tracedecay-code-index --features hotpath --lib — 190 passed, 0 failed
• npm run lint:commit — pass

  

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[github-actions]

Performance Comparison codex/tracedecay-total-redesign-plan-reopened → cursor/hotpath-code-index-gaps-c42d

Total Elapsed Time: 5.50s → 5.12s (-7.0%)
CPU Baseline: 90.00µs → 90.43µs (+0.5%)
Benchmark ID: index-bench-timing

timing - Execution duration of functions.

+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| Function                                 | Calls                      | Avg                             | P95                             | Total                           | % Total                      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| tracedecay-index-bench                   | 1 → 1 (+0.0%)              | 5.50s → 5.12s (-6.9%)           | 5.51s → 5.12s (-7.1%)           | 5.50s → 5.12s (-6.9%)           | 100.00% → 100.00% (+0.0%)    |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| query.artifact.append_pages              | 13 → 13 (+0.0%)            | 199.91ms → 184.38ms (-7.8%)     | 272.89ms → 270.53ms (-0.9%)     | 2.60s → 2.40s (-7.7%)           | 47.22% → 46.83% (-0.8%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| query.artifact.batch.sqlite              | 13 → 13 (+0.0%)            | 126.00ms → 122.50ms (-2.8%)     | 169.61ms → 171.97ms (+1.4%)     | 1.64s → 1.59s (-3.0%)           | 29.77% → 31.12% (+4.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| query.artifact.batch.postings            | 13 → 13 (+0.0%)            | 109.78ms → 106.77ms (-2.7%)     | 148.90ms → 151.52ms (+1.8%)     | 1.43s → 1.39s (-2.8%)           | 25.93% → 27.12% (+4.6%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| code_index.workers.install               | 83 → 83 (+0.0%)            | 18.11ms → 15.63ms (-13.7%)      | 72.81ms → 52.13ms (-28.4%) 🚀   | 1.50s → 1.30s (-13.3%)          | 27.32% → 25.34% (-7.2%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| CodeIndexProductionOwnerV1::extract_file | 276 → 276 (+0.0%)          | 4.65ms → 4.48ms (-3.7%)         | 6.94ms → 6.74ms (-2.9%)         | 1.28s → 1.24s (-3.1%)           | 23.32% → 24.14% (+3.5%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| code_index.build.and_publish             | 2 → 2 (+0.0%)              | 514.94ms → 496.82ms (-3.5%)     | 516.42ms → 497.29ms (-3.7%)     | 1.03s → 993.65ms (-3.5%)        | 18.71% → 19.41% (+3.7%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| domain.canonical.sha256                  | 114526 → 114526 (+0.0%)    | 8.63µs → 8.43µs (-2.3%)         | 13.95µs → 13.81µs (-1.0%)       | 988.63ms → 965.36ms (-2.4%)     | 17.96% → 18.86% (+5.0%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| query.artifact.finalization.advance_wake | 14 → 14 (+0.0%)            | 59.07ms → 54.63ms (-7.5%)       | 286.26ms → 267.39ms (-6.6%)     | 826.98ms → 764.86ms (-7.5%)     | 15.03% → 14.94% (-0.6%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| query.artifact.prepare_pages             | 13 → 13 (+0.0%)            | 62.29ms → 52.01ms (-16.5%)      | 91.55ms → 85.52ms (-6.6%)       | 809.82ms → 676.12ms (-16.5%)    | 14.72% → 13.21% (-10.3%)     |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| code_index.chunk.index_file              | 276 → 276 (+0.0%)          | 2.23ms → 2.08ms (-6.7%)         | 3.08ms → 3.02ms (-1.9%)         | 616.21ms → 572.99ms (-7.0%)     | 11.20% → 11.20% (+0.0%)      |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| query.artifact.batch.parallel_prepare    | 13 → 13 (+0.0%)            | 50.79ms → 41.36ms (-18.6%)      | 73.86ms → 71.89ms (-2.7%)       | 660.27ms → 537.64ms (-18.6%)    | 12.00% → 10.50% (-12.5%)     |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| code_index.extract.parser_artifact       | 276 → 276 (+0.0%)          | 1.89ms → 1.89ms (+0.0%)         | 2.81ms → 2.83ms (+0.7%)         | 521.79ms → 522.16ms (+0.1%)     | 9.48% → 10.20% (+7.6%)       |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| code_index.build.assemble                | 2 → 2 (+0.0%)              | 193.21ms → 185.01ms (-4.2%)     | 203.42ms → 197.26ms (-3.0%)     | 386.41ms → 370.01ms (-4.2%)     | 7.02% → 7.23% (+3.0%)        |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| 🆕 code_index.chunk.build                | 0 → 276 (+100.0%) ⚠️       | 0.00ns → 1.24ms (+100.0%) ⚠️    | 0.00ns → 1.82ms (+100.0%) ⚠️    | 0.00ns → 343.20ms (+100.0%) ⚠️  | 0.00% → 6.71% (+100.0%) ⚠️   |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+
| 🗑️ code_index.chunk.map_ordered          | 780 → 0 (-100.0%) 🚀       | 448.90µs → 0.00ns (-100.0%) 🚀  | 564.74µs → 0.00ns (-100.0%) 🚀  | 350.14ms → 0.00ns (-100.0%) 🚀  | 6.36% → 0.00% (-100.0%) 🚀   |
+------------------------------------------+----------------------------+---------------------------------+---------------------------------+---------------------------------+------------------------------+

---

Generated with hotpath-rs

[ScriptedAlchemy]

Merged into PR #707's integration branch at 3ba9af6da1b13d0488afcdbf695ac348caa5eda7. Validation: the 196-test code-index library suite passed serially after the parallel runner deadlocked, and both hotpath compilation and the direct feature-off gate passed.

[ScriptedAlchemy]

Corrective follow-up: the instrumentation from this PR was reverted in 4fc1f06745e83daba4071ec0956b6e49f95c3d41.

The deep audit found that four labels have no production callers, several labels duplicate centralized spans, and the published profile proves none of the 27 added labels. Focused labels may return only with matched runtime evidence showing that each proposed measurement corresponds to observed production cost.