What problem does it solve? Sequential build pipelines are slow when a backlog partition contains many independent issues, but naive parallel builds risk stale-green merges that break main. This Skill executes multiple builds concurrently while keeping merges safe. ## Core Features & Use Cases - Capped parallel execution: Runs multiple build subagents at once in separate git worktrees, bounded by a configurable concurrency_max (default 4), with collision groups serialized internally. - Rebase-before-merge safety: Serializes merges under a lock, rebases each PR onto the latest main, and re-confirms CI green and review pass before merging, so stale-green merges never reach main. - Fleet supervision and evidence custody: Polls in-flight members via heartbeat files, parks stalled members without interrupting live work, and verifies integrity digests plus per-issue AC/review evidence on every subagent return. - Use Case: A team draining a backlog of ten independent issues configures the concurrency slot with this executor so four builds run simultaneously, each merging only after re-validation against the moving main branch. ## Quick Start Configure the concurrency slot to faffter-dark-concurrency-parallel in .faffrc and let the build pass execute the partition in parallel worktrees.
