Phase 23.4: Run targeted optimization cleanup smoke

[jununfly]

This was generated by AI during triage.

Parent

• Phase 23: Optimization architecture cleanup #218
• Post-PRD optimization tracker for Rust indexing performance #165

What to build

Validate that Phase 23 cleanup preserved the evidence loop and basic Rust indexing behavior using targeted tests and smoke/profile evidence. This slice should not rerun a full VS Code sparse scoreboard by default.

Acceptance criteria

• Evidence comparison/ranking/decision fixture tests pass after cleanup.
• A targeted smoke/profile run produces valid artifacts after cleanup.
• RSS is recorded or an unavailable reason is recorded.
• Sufficiency is checked if the touched paths can affect index/read/explore behavior.
• GraphStats or an equivalent semantic parity signal is recorded when the smoke writes an index.
• The validation artifact or documented smoke output states that Rust default rollout readiness is not claimed.
• Do not run a full VS Code sparse scoreboard unless Phase 23.3: Clean up performance production boundaries #221 changes final-evidence semantics or behavior in a way targeted smoke/profile cannot validate.
• If a full VS Code sparse scoreboard is needed, document why targeted smoke/profile was insufficient before running it.

Blocked by

• Phase 23.3: Clean up performance production boundaries #221

[jununfly]

This was generated by AI during triage.

Completed as part of Phase 23.

Summary:

• Evidence output now includes an explicit local-only Evidence Contract section.
• RSS unavailable reasons are now surfaced in generated comparison output.
• Performance experiment paths are inventoried as production path, retained diagnostic, or dead candidate.
• Production cleanup stayed on the benchmark/evidence boundary and did not change default indexing behavior.
• Targeted smoke/profile artifacts were generated from existing Phase 22 evidence; no full VS Code sparse scoreboard was run.
• Profile Rust parseExtractionMs before next optimization #224 was created as the next Post-PRD optimization tracker for Rust indexing performance #165 step for parseExtractionMs profiling.

Artifacts:

• docs/benchmarks/2026-06-18-rust-indexing-core-phase-23-experiment-inventory.md
• docs/benchmarks/2026-06-18-rust-indexing-core-phase-23-targeted-evidence-smoke-comparison.md
• docs/benchmarks/2026-06-18-rust-indexing-core-phase-23-targeted-evidence-smoke-decision-draft.md
• docs/benchmarks/2026-06-18-rust-indexing-core-phase-23-closeout-decision.md

Validation:

• npx vitest run __tests__/rust-indexing-evidence.test.ts
• npx vitest run __tests__/rust-indexing-evidence.test.ts __tests__/rust-indexing-experiment.test.ts
• npm run build

#165 remains open. Rust default rollout readiness is not claimed.