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/notify-discord.yml

@@ -0,0 +1,14 @@
+name: notify-discord
+
+on:
+  release:
+    types: [released] # fires when a draft release is published
+
+jobs:
+  notify:
+    runs-on: blacksmith-4vcpu-ubuntu-2404
+    steps:
+      - name: Send nicely-formatted embed to Discord
+        uses: SethCohen/github-releases-to-discord@24d166886aee4646d448c8a389ff9e1ebcab3682 # v1.20.0
+        with:
+          webhook_url: ${{ secrets.DISCORD_WEBHOOK }}