Add reusable multi-session skill and five-page project workbench

examples/bridge.example.json

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+{
+  "mode": "desktop_queue",
+  "session_id": "human-progress",
+  "thread_id": "REPLACE_WITH_REAL_THREAD_ID",
+  "worker_id": "local-progress-bridge",
+  "cwd": ".",
+  "state_file": "./.agent-workbench/worker-state.json",
+  "mirror_state_file": "./.agent-workbench/mirror-state.json",
+  "include_progress_snapshot": true,
+  "max_turn_seconds": 600,
+  "poll_seconds": 5,
+  "mirror_seconds": 5,
+  "read_only": true,
+  "instructions": "你是项目进度与方案决策入口。依据真实证据回答进度与方案；未知说明未知。此沟通角色不修改代码或系统，不扩大权限。",
+  "control": {
+    "url": "http://127.0.0.1:8796",
+    "token_file": "~/.local/state/agent-workbench/access-token"
+  }
+}

examples/control.example.json

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+{
+  "title": "Agent Workbench",
+  "bind": "127.0.0.1",
+  "port": 8796,
+  "runtime_root": "~/.local/state/agent-workbench",
+  "token_file": "~/.local/state/agent-workbench/access-token",
+  "allowed_hosts": ["localhost:8796"],
+  "primary_session_id": "human-progress",
+  "metrics": {}
+}