feat: expose background service lifecycle (#36895)

packages/core/test/fixture/process-lock-worker.ts

@@ -0,0 +1,17 @@
+import { ProcessLock } from "@opencode-ai/core/util/process-lock"
+import { Effect, Schema } from "effect"
+import fs from "node:fs/promises"
+
+const input = Schema.decodeUnknownSync(
+  Schema.fromJsonString(Schema.Struct({ file: Schema.String, ready: Schema.String })),
+)(process.argv[2])
+
+await Effect.runPromise(
+  Effect.scoped(
+    Effect.gen(function* () {
+      yield* ProcessLock.acquire(input.file)
+      yield* Effect.promise(() => fs.writeFile(input.ready, String(process.pid)))
+      return yield* Effect.never
+    }),
+  ),
+)