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/icons/README.md

@@ -0,0 +1,14 @@
+# Tauri Icons
+
+Here's the process I've been using to create icons:
+
+- Save source image as `app-icon.png` in `packages/desktop`
+- `cd` to `packages/desktop`
+- Run `bun tauri icon -o src-tauri/icons/{environment}`
+- Use [Image2Icon](https://img2icnsapp.com/)'s 'Big Sur Icon' preset to generate an `icon.icns` file and place it in the appropriate icons folder
+
+The Image2Icon step is necessary as the `icon.icns` generated by `app-icon.png` does not apply the shadow/padding expected by macOS,
+so app icons appear larger than expected.
+
+For unpackaged Electron on macOS, `app.dock.setIcon()` should use a PNG. Keep `dock.png` in each channel folder synced with the
+extracted `icon_128x128@2x.png` from that channel's `icon.icns` so the dev Dock icon matches the packaged app inset.