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/

.vscode/launch.example.json

@@ -0,0 +1,11 @@
+{
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "type": "bun",
+      "request": "attach",
+      "name": "opencode (attach)",
+      "url": "ws://localhost:6499/"
+    }
+  ]
+}

.vscode/settings.example.json

@@ -0,0 +1,5 @@
+{
+  "recommendations": [
+    "oven.bun-vscode"
+  ]
+}