Review an ArduPilot new-board hwdef PR. Stashes any local changes, checks the PR out as a branch in the current repo, runs DMA / board-ID / file-presence / commit-structure checks, layers the hwdef playbook on top, and (after confirmation) posts a review comment on the PR — then restores the original branch and pops the stash. Use when the user asks to review or pre-review an hwdef PR.
