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/atuin-18.16.1/.github/ISSUE_TEMPLATE/bug.yaml

@@ -0,0 +1,39 @@
+name: Bug Report
+description: File a bug report
+title: "[Bug]: "
+labels: ["bug", "triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: textarea
+    id: what-expected
+    attributes:
+      label: What did you expect to happen?
+      placeholder: Tell us what you expected to see!
+    validations:
+      required: true
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      placeholder: Tell us what you see!
+    validations:
+      required: true
+  - type: textarea
+    id: doctor
+    validations:
+      required: true
+    attributes:
+      label: Atuin doctor output
+      description: Please run 'atuin doctor' and share the output. If it fails to run, share any errors. This requires Atuin >=v18.1.0
+      render: yaml
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow our [Code of Conduct](https://github.com/atuinsh/atuin/blob/main/CODE_OF_CONDUCT.md)
+      options:
+        - label: I agree to follow this project's Code of Conduct
+          required: true