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

onchain/.claude-code-supervisor.yml

@@ -1,6 +1,6 @@
 triage:
   command: "claude -p --no-session-persistence"
-  model: "claude-haiku-4-20250414"
+  model: "claude-haiku-4-5-20251001"
 
 notify:
   command: "/tmp/supervisor-notify.sh"