Phase 23.5: Decide next post-PRD optimization step

[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

Write the Phase 23 closeout decision and manually update #165 with the completed governance result and the next concrete post-PRD optimization step.

This slice must not close #165. It should make the next step explicit enough that follow-up work does not restart with vague “continue optimizing” language.

Acceptance criteria

• Write a Phase 23 closeout decision under docs/benchmarks/.
• Summarize what evidence/tooling contract changed.
• Summarize what inventory entries were classified.
• Summarize what production cleanup was performed.
• Summarize what validation ran.
• State whether RSS was recorded or why it was unavailable.
• State whether sufficiency was checked or why it was not applicable.
• Select exactly one next Post-PRD optimization tracker for Rust indexing performance #165 step: one bounded optimization candidate, one profiling issue, one architecture blocker, or no-go direct optimization until a named diagnostic gap is closed.
• Manually update Post-PRD optimization tracker for Rust indexing performance #165 with a concise tracker comment.
• Explicitly state that Post-PRD optimization tracker for Rust indexing performance #165 remains open.
• Explicitly state that Rust default rollout readiness is not claimed.

Blocked by

• Phase 23.4: Run targeted optimization cleanup smoke #222

[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.