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/.zed/settings.json

@@ -0,0 +1,9 @@
+{
+  "format_on_save": "on",
+  "formatter": {
+    "external": {
+      "command": "bunx",
+      "arguments": ["prettier", "--stdin-filepath", "{buffer_path}"]
+    }
+  }
+}