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/opencode/test/fake/account.ts

@@ -0,0 +1,9 @@
+import { Effect, Layer, Option } from "effect"
+import { Account } from "../../src/account/account"
+
+export const empty = Layer.mock(Account.Service)({
+  active: () => Effect.succeed(Option.none()),
+  activeOrg: () => Effect.succeed(Option.none()),
+})
+
+export * as AccountTest from "./account"