fix(acp-bridge,openclaw): use AgentRelay.spawnAgent instead of removed spawnPty

The AgentRelay class no longer exposes spawnPty (it lives only on
AgentRelayClient). The two remaining callers were using the unified
spawnAgent facade was renamed during the #1003 spawn-provider work, so
this restores the build for both packages.

Author: claude

packages/acp-bridge/src/acp-agent.ts

@@ -736,7 +736,7 @@ export class RelayACPAgent implements acp.Agent {
 
     try {
       const relay = this.relay!;
-      const agent = await relay.spawnPty({
+      const agent = await relay.spawnAgent({
         name,
         cli,
         task,

packages/openclaw/src/spawn/process.ts

@@ -171,7 +171,7 @@ export class ProcessSpawnProvider implements SpawnProvider {
         } as NodeJS.ProcessEnv,
       });
 
-      await relay.spawnPty({
+      await relay.spawnAgent({
         name: agentName,
         cli: 'node',
         args: [bridgePath],