feat(aircoding): AirCoding V2 baseline — deterministic multi-agent architecture

Forked from OpenCode v1.17.4 with multi-agent system:
- 5 agents: aircoding, scheduler, worker, architect, reviewer
- Deterministic DAG scheduling engine (coordinator_tick)
- Tool whitelists as hard enforcement
- AirCoding validation plugin
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/desktop/README.md

@@ -0,0 +1,19 @@
+# OpenCode Desktop
+
+The OpenCode Desktop app, built with Electron.
+
+## Development
+
+```bash
+bun install
+bun dev
+```
+
+## Build
+
+Run the `build` script to build the app's JS assets, then `package` to
+bundle the assets as an application. The resulting app will be in `dist/`.
+
+```bash
+bun run build && bun run package
+```