fix: refactor AGENTS.md into progressive-disclosure structure (#184)

- Root AGENTS.md: 350+ lines → 68 lines (map, not encyclopedia)
- New docs/dev-environment.md (67 lines): Docker, dev.sh, ports, pitfalls
- New docs/ci-pipeline.md (73 lines): Woodpecker setup, monitoring, debugging
- New docs/testing.md (41 lines): Foundry, E2E, version validation
- New docs/codeberg-api.md (32 lines): .netrc auth, API usage
- Updated stale model refs in .claude-code-supervisor.yml files
- Sub-component AGENTS.md files unchanged
- Context docs (PRODUCT-TRUTH, ARCHITECTURE, UX-DECISIONS) unchanged

.claude-code-supervisor.yml

@@ -6,7 +6,7 @@ triage:
   # Command that accepts a prompt on stdin and returns text on stdout.
   # Default: claude -p (uses Claude Code's own auth)
   command: "claude -p --no-session-persistence"
-  model: "claude-haiku-4-20250414"
+  model: "claude-haiku-4-5-20251001"
   max_tokens: 150
 
 notify: