feat(core): add dynamic swarm worker tool (#3433)

* feat(core): add dynamic swarm worker tool

  Add a swarm tool for ad-hoc parallel worker execution with bounded concurrency, wait-all and first-success modes, per-worker failure
  isolation, and aggregated results.

  Register the tool in core, prevent nested worker recursion, and document the new workflow.

* fix(core): harden swarm worker execution

  Prevent swarm calls from bypassing the outer scheduler concurrency budget.

  Disallow interactive question prompts in swarm workers by default, and avoid incomplete Markdown table escaping by using an HTML entity for
  pipe characters. Add focused tests for the scheduler behavior, worker tool restrictions, and result formatting.
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@ -199,9 +199,9 @@ Agent Arena is experimental. Current limitations:
## Comparison with other multi-agent modes
Agent Arena is one of several planned multi-agent modes in Qwen Code. **Agent Team** and **Agent Swarm** are not yet implemented — the table below describes their intended design for reference.
Agent Arena is one of several multi-agent modes in Qwen Code. **Agent Team** is not yet implemented. **Agent Swarm** is available as a lightweight tool for batch-style parallel worker execution.
| | **Agent Arena** | **Agent Team** (planned) | **Agent Swarm** (planned) |
| | **Agent Arena** | **Agent Team** (planned) | **Agent Swarm** |
| :---------------- | :----------------------------------------------------- | :------------------------------------------------- | :------------------------------------------------------- |
| **Goal** | Competitive: Find the best solution to the _same_ task | Collaborative: Tackle _different_ aspects together | Batch parallel: Dynamically spawn workers for bulk tasks |
| **Agents** | Pre-configured models compete independently | Teammates collaborate with assigned roles | Workers spawned on-the-fly, destroyed on completion |