Swarm Orchestration

Reference implementation: lib/swarm/ in this plugin. Pattern origin: OpenAI Symphony — https://github.com/openai/symphony

The shape

A swarm over an issue tracker has four parts. Getting any one wrong produces a characteristic failure, so they are worth naming separately.

Part	Responsibility	Failure if missing
Source	Which issues are eligible	Agents work on whatever they find, including issues nobody groomed
Ledger	Who holds what, exclusively	Two workers, one issue, two pull requests
Workspace	Filesystem isolation per issue	Concurrent workers corrupt each other's checkout
Conductor	Serialised dispatch, bounded concurrency	Unbounded fan-out; cost and rate limits blow out