docs: 2026-09-26 health and debloat audit

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Summary

Read-only health audit of main at 90d2ee8 (after #81/#82/#88). No product code changes — adds only docs/audits/2026-09-26-health-audit.md.

Contents

• Executive summary of overall health
• Dead/parked-feature inventory (GRE-205–208, chat orphans, kitchen-sink leftovers) with evidence
• CI / checks inventory (workflows, bots, flakiness, what makes PRs look UNSTABLE)
• Dependencies (audit clean; Dependabot chore(deps): bump @fastify/multipart from 10.1.1 to 10.1.2 in /web #93–chore(deps): bump @tanstack/react-query from 5.102.4 to 5.103.2 in /web #97 noted; unused/outdated/heavy)
• Local gate results (lint/typecheck/tests/build/browser/audit/manifests/sidecar)
• Ranked, PR-sized debloat chunks (A–J) with risk/effort

Test plan

• Document-only PR; no runtime behavior change
• Skim executive summary + Chunk A–C recommendations for next cleanup PRs

  

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