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/ISSUE_TEMPLATE/5-feature-request.yml

@@ -0,0 +1,32 @@
+name: 🎁 Feature Request
+description: Propose a new feature for Codex
+labels:
+  - enhancement
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Is Codex missing a feature that you'd like to see? Feel free to propose it here.
+
+        Before you submit a feature:
+        1. Search existing issues for similar features. If you find one, 👍 it rather than opening a new one.
+        2. The Codex team will try to balance the varying needs of the community when prioritizing or rejecting new features. Not all features will be accepted. See [Contributing](https://github.com/openai/codex/blob/main/docs/contributing.md) for more details.
+
+  - type: input
+    id: variant
+    attributes:
+      label: What variant of Codex are you using?
+      description: (e.g., App, IDE Extension, CLI, Web)
+    validations:
+      required: true
+  - type: textarea
+    id: feature
+    attributes:
+      label: What feature would you like to see?
+    validations:
+      required: true
+  - type: textarea
+    id: notes
+    attributes:
+      label: Additional information
+      description: Is there anything else you think we should know?