docs: Chunk 3 grill, PRD, ADRs, and doc updates
- docs/prd/chunk-3-skills-library.md: PRD for 42-skill library rebuild;
AGENTS.md refactor as prerequisite; factory bootstrap order (write-eval
first); source field schema; upstream review cadence; design phase
sequence; IaC/Gitea scope decisions
- docs/adr/0011-provider-agnostic-issue-tracker.md: file-based default,
Gitea as provider adapter, "issue" as canonical cross-provider term
- docs/adr/0012-agents-md-provider-agnostic-entry-point.md: AGENTS.md as
content source, CLAUDE.md as thin adapter; partially supersedes ADR-0005
- CONTEXT.md: 8 new glossary terms (AGENTS.md, skill composition, source
field, provider-agnostic issue tracker, design phase sequence, PRD scope,
issue scope, bidirectional reference principle); CLAUDE.md index model
updated; stale workflow example fixed
- docs/ROADMAP.md: changelog tooling and IaC/Gitea scope resolved; when:
field question updated; Chunk 3 grill housekeeping note added
- docs/spec/overview.md: Chunk 3 target updated with PRD link, skill count,
and AGENTS.md prerequisite
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>