接续L4-TOOL-DB浏览器Provider协议

结论：浏览器 Worker 已支持可插拔 Python runtime provider 的 line I/O，缺真实 Python/WASM runtime 时仍保持阻塞不解锁。

wasm-port/tests/sdk/node/verify_tool_db_process_port.mjs

@@ -80,6 +80,66 @@ class FakeBlockedWorker {
   terminate() {}
 }
 
+class FakeReadyWorker {
+  constructor() {
+    this.listeners = new Map();
+    this.lines = [
+      "v2.1",
+      "T10 P110 D0.10 Z0.10",
+      "FINI (get_cmd)",
+      "FINI (update recvd) t11 p111 d0.33 z0.11",
+      "FINI (update recvd) t14 p0",
+      "FINI (update recvd) t0 p0",
+    ];
+  }
+
+  addEventListener(type, listener) {
+    this.listeners.set(type, listener);
+  }
+
+  postMessage(message) {
+    queueMicrotask(() => {
+      if (message.type === "start") {
+        this.reply(message, {
+          runtimeExecutionReady: true,
+          status: "browser_python_wasm_runtime_ready",
+          executionEnabled: false,
+          promotionAllowed: false,
+        });
+        return;
+      }
+      if (message.type === "writeLine") {
+        this.reply(message, { executionEnabled: false, promotionAllowed: false });
+        return;
+      }
+      if (message.type === "readLine") {
+        this.reply(message, {
+          line: this.lines.shift(),
+          executionEnabled: false,
+          promotionAllowed: false,
+        });
+        return;
+      }
+      if (message.type === "close") {
+        this.reply(message, { executionEnabled: false, promotionAllowed: false });
+      }
+    });
+  }
+
+  reply(message, payload) {
+    this.listeners.get("message")?.({
+      data: {
+        id: message.id,
+        type: message.type,
+        ok: true,
+        ...payload,
+      },
+    });
+  }
+
+  terminate() {}
+}
+
 const browserWorkerAdapter = createLinuxCncToolDbBrowserWorkerAdapter({
   workerUrl: "./tool-db-python-worker.js",
   workerFactory: () => new FakeBlockedWorker(),
@@ -99,6 +159,25 @@ assert.equal(browserWorkerBlockedPlan.runtimeExecutionReady, false);
 assert.equal(browserWorkerBlockedPlan.promotionAllowed, false);
 await browserWorkerPort.close();
 
+const readyWorkerAdapter = createLinuxCncToolDbBrowserWorkerAdapter({
+  workerUrl: "./tool-db-python-worker.js",
+  workerFactory: () => new FakeReadyWorker(),
+});
+const readyWorkerPort = createLinuxCncToolDbProcessPort({
+  dbProgramPath: "./db_nonran.py",
+  runtimeMode: readyWorkerAdapter.runtimeMode,
+  runtimeAdapter: readyWorkerAdapter,
+});
+const readyWorkerStart = await readyWorkerPort.start();
+assert.equal(readyWorkerStart.runtimeExecutionReady, true);
+assert.equal(readyWorkerStart.status, "browser_python_wasm_runtime_ready");
+const readyWorkerPlan = await readyWorkerPort.runTransactionPlan();
+assert.equal(readyWorkerPlan.status, "runtime_adapter_transaction_plan_executed");
+assert.equal(readyWorkerPlan.runtimeExecutionReady, true);
+assert.equal(readyWorkerPlan.promotionAllowed, false);
+assert.equal(validateToolDbTranscript(readyWorkerPort.exportTranscript()).ready, true);
+await readyWorkerPort.close();
+
 const transcript = [
   { direction: "read", line: "v2.1" },
   { direction: "write", line: "g" },