What problem does it solve? Coordinating a release that spans multiple repositories is error-prone: PRs must open in dependency order, merges must respect upstream changes, and a failed downstream integration can silently break the train. This Skill provides the entry point to the phase-loop run-train coordinator, which automates draft PR creation, train-level review, and sequential merging with downstream re-verification. ## Core Features & Use Cases - Topo-ordered draft PRs: Opens draft PRs across all train nodes in dependency order after a preflight check, stopping before any PR is opened if preflight fails. - Governed merge phase: With --governed, runs train-level review, then merges upstream nodes first and re-verifies each downstream node against the upstream merged SHA. - Crash-resumable ledger: Inspect state with phase-loop train-status and resume interrupted runs; already-merged nodes are skipped and blocked nodes retried. - Use Case: A platform team ships a breaking API change across five service repos. They define a train roadmap with node dependencies, run the coordinator to open all draft PRs, gather one train-level review, then merge sequentially with automatic downstream re-verification. ## Quick Start Ask the assistant to run the release train by invoking phase-loop run-train --train <train-roadmap-file> --governed against your train roadmap Markdown file.
