v1.8.1 — /autoresearch:learn improvements and stability fixes

/autoresearch:learn — 10 Enhancements

This patch adds 10 improvements to the autonomous documentation engine, making it smarter about what docs to generate and how to keep them in sync.

New capabilities

• Mermaid architecture diagrams — system-architecture.md now auto-generates component, data flow, and dependency diagrams
• Conditional documentation — 4 new doc types auto-created when signals detected:
  • api-reference.md (routes, controllers, OpenAPI specs)
  • testing-guide.md (test dirs, CI test steps)
  • configuration-guide.md (.env.example, config/ directory)
  • changelog.md (git log with conventional commit grouping)
• Dependency documentation — codebase-summary.md now includes a Key Dependencies section with package names, versions, and purpose
• Diff-based targeted updates — Update mode maps git changes to affected docs, only deeply refreshes stale ones
• Cross-reference linking — "See also" links between related docs (e.g., architecture → API reference)
• Incremental scouting scaffold — Framework for delta-only rescans using cached scout context (future optimization)
• --format flag — Output as markdown (default), html, json, or rst

Release script improvements

• release.sh and release.md now include guide/scenario/ and COMPARISON.md in the doc review checklist and auto-staging

Full changelog

Full Changelog: v1.8.0...v1.8.1