fix: stabilize embedded runner queueing

src/agents/pi-embedded-runner/run.ts

@@ -71,6 +71,8 @@ export async function runEmbeddedPiAgent(
   const globalLane = resolveGlobalLane(params.lane);
   const enqueueGlobal =
     params.enqueue ?? ((task, opts) => enqueueCommandInLane(globalLane, task, opts));
+  const enqueueSession =
+    params.enqueue ?? ((task, opts) => enqueueCommandInLane(sessionLane, task, opts));
   const channelHint = params.messageChannel ?? params.messageProvider;
   const resolvedToolResultFormat =
     params.toolResultFormat ??
@@ -81,7 +83,7 @@ export async function runEmbeddedPiAgent(
       : "markdown");
   const isProbeSession = params.sessionId?.startsWith("probe-") ?? false;
 
-  return enqueueCommandInLane(sessionLane, () =>
+  return enqueueSession(() =>
     enqueueGlobal(async () => {
       const started = Date.now();
       const resolvedWorkspace = resolveUserPath(params.workspaceDir);

src/daemon/service-env.ts

@@ -121,7 +121,8 @@ export function buildMinimalServicePath(options: BuildServicePathOptions = {}):
     return env.PATH ?? "";
   }
 
-  return getMinimalServicePathPartsFromEnv({ ...options, env }).join(path.delimiter);
+  const delimiter = platform === "win32" ? path.win32.delimiter : path.posix.delimiter;
+  return getMinimalServicePathPartsFromEnv({ ...options, env }).join(delimiter);
 }
 
 export function buildServiceEnvironment(params: {