fix: eliminate duplicate WebSocket messages during agent history priming

- Skip dispatching individual agent_stream events when replaying history
  (the snapshot is sent after priming anyway, so individual events were wasted)
- Add WebSocket message logging on client (type, size, id) for debugging
- Change default daemon URL from dev to localhost
- Clean up unused imports in session.ts

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

packages/server/src/server/agent/agent-manager.ts

@@ -707,7 +707,11 @@ export class AgentManager {
         break;
     }
 
-    this.dispatchStream(agent.id, event);
+    // Skip dispatching individual stream events during history replay.
+    // The caller will send a batched agent_stream_snapshot after priming.
+    if (!options?.fromHistory) {
+      this.dispatchStream(agent.id, event);
+    }
   }
 
   private recordTimeline(agent: ManagedAgent, item: AgentTimelineItem): void {

packages/server/src/server/session.ts

@@ -1,6 +1,6 @@
 import { v4 as uuidv4 } from "uuid";
 import { readFile, mkdir, writeFile } from "fs/promises";
-import { exec, spawn } from "child_process";
+import { exec } from "child_process";
 import { promisify, inspect } from "util";
 import { join } from "path";
 import invariant from "tiny-invariant";