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
- System prompt injection for routing
- V1 requirements: C4 docs, ADR, AGENTS.md, debug-log.md
- Design documents in docs/

packages/opencode/test/permission/arity.test.ts

@@ -0,0 +1,33 @@
+import { test, expect } from "bun:test"
+import { BashArity } from "../../src/permission/arity"
+
+test("arity 1 - unknown commands default to first token", () => {
+  expect(BashArity.prefix(["unknown", "command", "subcommand"])).toEqual(["unknown"])
+  expect(BashArity.prefix(["touch", "foo.txt"])).toEqual(["touch"])
+})
+
+test("arity 2 - two token commands", () => {
+  expect(BashArity.prefix(["git", "checkout", "main"])).toEqual(["git", "checkout"])
+  expect(BashArity.prefix(["docker", "run", "nginx"])).toEqual(["docker", "run"])
+})
+
+test("arity 3 - three token commands", () => {
+  expect(BashArity.prefix(["aws", "s3", "ls", "my-bucket"])).toEqual(["aws", "s3", "ls"])
+  expect(BashArity.prefix(["npm", "run", "dev", "script"])).toEqual(["npm", "run", "dev"])
+})
+
+test("longest match wins - nested prefixes", () => {
+  expect(BashArity.prefix(["docker", "compose", "up", "service"])).toEqual(["docker", "compose", "up"])
+  expect(BashArity.prefix(["consul", "kv", "get", "config"])).toEqual(["consul", "kv", "get"])
+})
+
+test("exact length matches", () => {
+  expect(BashArity.prefix(["git", "checkout"])).toEqual(["git", "checkout"])
+  expect(BashArity.prefix(["npm", "run", "dev"])).toEqual(["npm", "run", "dev"])
+})
+
+test("edge cases", () => {
+  expect(BashArity.prefix([])).toEqual([])
+  expect(BashArity.prefix(["single"])).toEqual(["single"])
+  expect(BashArity.prefix(["git"])).toEqual(["git"])
+})