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/core/test/state.test.ts

@@ -0,0 +1,34 @@
+import { describe, expect } from "bun:test"
+import { State } from "@opencode-ai/core/state"
+import { Deferred, Effect, Exit, Fiber, Layer, Scope } from "effect"
+import { testEffect } from "./lib/effect"
+
+const it = testEffect(Layer.empty)
+
+describe("State", () => {
+  it.effect("commits a transform atomically when its updater is interrupted", () =>
+    Effect.gen(function* () {
+      const rebuilding = yield* Deferred.make<void>()
+      const release = yield* Deferred.make<void>()
+      let block = true
+      const state = State.create({
+        initial: () => ({ values: [] as string[] }),
+        editor: (draft) => ({ add: (value: string) => draft.values.push(value) }),
+        finalize: () =>
+          block ? Deferred.succeed(rebuilding, undefined).pipe(Effect.andThen(Deferred.await(release))) : Effect.void,
+      })
+      const scope = yield* Scope.make()
+      const update = yield* state.transform().pipe(Scope.provide(scope))
+      const fiber = yield* update((editor) => editor.add("registered")).pipe(Effect.forkChild)
+      yield* Deferred.await(rebuilding)
+      const interruption = yield* Fiber.interrupt(fiber).pipe(Effect.forkChild)
+      block = false
+      yield* Deferred.succeed(release, undefined)
+      yield* Fiber.join(interruption)
+
+      expect(state.get().values).toEqual(["registered"])
+      yield* Scope.close(scope, Exit.void)
+      expect(state.get().values).toEqual([])
+    }),
+  )
+})