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/openai-codex/.codex/skills/test-tui/SKILL.md

@@ -0,0 +1,14 @@
+---
+name: test-tui
+description: Guide for testing Codex TUI interactively
+---
+
+You can start and use Codex TUI to verify changes. 
+
+Important notes:
+
+Start interactively.
+Always set RUST_LOG="trace" when starting the process.
+Pass `-c log_dir=<some_temp_dir>` argument to have logs written to a specific directory to help with debugging.
+When sending a test message programmatically, send text first, then send Enter in a separate write (do not send text + Enter in one burst).
+Use `just codex` target to run - `just codex -c ...`