PR Merge Train

Drain open PR queues by merging safe independent PRs first, fixing blocked PRs narrowly, and moving on whenever unrelated CI is still pending. The goal is lower WIP, not a serial full review of every branch.

Contract

Inputs:

• Repository with open GitHub PRs
• Optional explicit dependency order from the user, such as "merge #12 before #18"

Outputs:

• Queue classification for every open PR
• PRs merged, PRs fixed and pushed with CI pending, and PRs blocked with exact blockers
• Checks and review evidence used for each decision