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/.github/dependabot.yaml

@@ -0,0 +1,42 @@
+# https://docs.github.com/en/code-security/dependabot/working-with-dependabot/dependabot-options-reference#package-ecosystem-
+
+version: 2
+updates:
+  - package-ecosystem: bun
+    directory: .github/actions/codex
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
+  - package-ecosystem: cargo
+    directories:
+      - codex-rs
+      - codex-rs/*
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
+  - package-ecosystem: devcontainers
+    directory: /
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
+  - package-ecosystem: docker
+    directory: codex-cli
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
+  - package-ecosystem: github-actions
+    directory: /
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7
+  - package-ecosystem: rust-toolchain
+    directory: codex-rs
+    schedule:
+      interval: weekly
+    cooldown:
+      default-days: 7