Initial commit: AirCoding V1.0.0 Alpha architecture baseline

Complete architecture document set with multi-model review remediation:
- Frozen interface contracts, runtime semantics, DB schemas
- Event/tool/error/provider registries
- Scheduler and main agent state machines
- C4 module/code views, solution architecture, baseline V1
- Multi-model review reports and joint assessment
- Phase-gate remediation complete (P0/P1/P2/UX resolved)
- Implementation plan with T-000A through T-045
- Reference folders kept as placeholders only

reference/opencode-1.15.5/.gitignore

@@ -0,0 +1,32 @@
+.DS_Store
+node_modules
+.worktrees
+.sst
+.env
+.env.local
+.idea
+.vscode
+.codex
+*~
+playground
+tmp
+dist
+ts-dist
+.turbo
+**/.serena
+.serena/
+/result
+refs
+Session.vim
+/opencode.json
+a.out
+target
+.scripts
+.direnv/
+
+# Local dev files
+opencode-dev
+UPCOMING_CHANGELOG.md
+logs/
+*.bun-build
+tsconfig.tsbuildinfo