Add a new implementation-pool-supervisor agent definition with an embedded
8-item PR Compliance Checklist. Workers dispatched by the pool supervisor
must complete all 8 items before creating any PR: CHANGELOG.md update,
CONTRIBUTORS.md update, commit footer (ISSUES CLOSED: #N), CI verification,
BDD tests, Epic reference, label application via forgejo-label-manager,
and milestone assignment. Includes concrete markdown examples for each
subsection and compliance verification pseudocode.
Also adds BDD test coverage (pr_compliance_pool_supervisor.feature + steps)
to verify the pool supervisor agent definition contains all 8 checklist items.
Parent Epic: #9779
ISSUES CLOSED: #9824
HAL9000
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