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/

.opencode/opencode.jsonc

@@ -0,0 +1,20 @@
+{
+  "$schema": "https://opencode.ai/config.json",
+  "provider": {},
+  "permission": {},
+  "references": {
+    "effect": {
+      "repository": "github.com/Effect-TS/effect-smol",
+      "description": "Use for Effect v4 and effect-smol implementation details",
+    },
+    "opencode-local": {
+      "path": "~/.local/share/opencode",
+      "description": "Contains opencode logs and data",
+    },
+  },
+  "mcp": {},
+  "tools": {
+    "github-triage": false,
+    "github-pr-search": false,
+  },
+}