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/.github/workflows/close-prs.yml

@@ -0,0 +1,50 @@
+name: close-prs
+
+on:
+  schedule:
+    - cron: "0 22 * * *" # Daily at 10:00 PM UTC
+  workflow_dispatch:
+    inputs:
+      dry-run:
+        description: "Log matching PRs without closing them"
+        type: boolean
+        default: true
+      max-close:
+        description: "Maximum matching PRs to close"
+        type: string
+        required: false
+        default: "50"
+
+jobs:
+  close:
+    runs-on: ubuntu-latest
+    timeout-minutes: 240
+    permissions:
+      contents: read
+      issues: write
+      pull-requests: write
+    steps:
+      - uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4.3.1
+
+      - uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
+        with:
+          bun-version: latest
+
+      - name: Close old PRs without enough positive reactions
+        env:
+          GITHUB_TOKEN: ${{ github.token }}
+        run: |
+          max_close="${{ inputs['max-close'] }}"
+          if [ -z "$max_close" ]; then
+            max_close="50"
+          fi
+
+          args=("--threshold" "2" "--age-months" "1" "--sleep-ms" "20000" "--max-close" "$max_close")
+
+          if [ "${{ github.event_name }}" = "schedule" ]; then
+            args+=("--execute")
+          elif [ "${{ inputs['dry-run'] }}" = "false" ]; then
+            args+=("--execute")
+          fi
+
+          bun script/github/close-prs.ts "${args[@]}"