Phase 14: Generate decision summary draft and companion docs

[jununfly]

This was generated by AI during triage.

Parent

Parent tracking issue: #154

What to build

Generate the Phase 14 Markdown decision summary draft from the raw artifact and add the canonical manifest plus companion documentation for formal Rust indexing experiments.

The summary is explicitly a draft, not the final rollout decision. It must state that Rust default rollout readiness is not automatically claimed. A maintainer must review or modify it before any final rollout decision.

Acceptance criteria

• Runner writes a Markdown decision summary draft to --summary-out.
• Summary draft includes experiment id, manifest path, target matrix, preflight summary, per-target arm availability, graph stats, elapsed metrics, peak RSS metrics or diagnostics, sufficiency gate status, performance gate status, regressions, target classifications, experiment classification, and rollout recommendation draft.
• Summary draft includes: Rust default rollout readiness is not claimed by this generated draft.
• Canonical manifest is added at docs/benchmarks/rust-indexing-core-phase-14.experiment.json.
• Companion doc is added at docs/benchmarks/rust-indexing-core-phase-14-experiment.md.
• Companion doc explains env vars, fallback path semantics, target classes, gates, exit codes, run commands, output files, and VS Code stress validation trigger.
• Focused tests or snapshot checks cover summary content and canonical manifest acceptance.

Blocked by

• Phase 14: Implement experiment/target classification and exit-code policy #159

[jununfly]

This was generated by AI during triage.

Implemented in local commit 73c1b35 Add Phase 14 Rust indexing experiment runner. Added canonical manifest and companion doc; focused tests verify canonical manifest acceptance and complete decision summary draft sections.