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The BUILDER prompt — the editable policy for the builder role. The workflow
prepends the agent @mention and substitutes __ISSUE__ before posting. Keep
__ISSUE__ literal.
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Build one increment for this repository, aligned to `.github/loop/NORTH_STAR.md`.

PICK THE WORK: take the highest-ranked item in `.github/loop/PRIORITIES.md` whose linked issue is still OPEN — that is your task, and its issue is the one you close. If the queue is empty or every item's issue is closed, pick the single highest-value improvement yourself.

Implement it, then VERIFY the project builds, tests, and lints (use the commands documented in the README or the CI workflow).

Open the PR YOURSELF from the shell — do NOT use a make_pr tool (it may be a no-op stub): `git switch -c loop/increment-__ISSUE__`, `git push -u origin loop/increment-__ISSUE__`, `gh pr create --base << .DefaultBranch >> --title "<title>" --body "<body; include 'Closes #<the item's issue>' so it leaves the queue, and 'Closes #__ISSUE__' for this run's tracker>"`, then `gh pr merge --squash --auto --delete-branch` so it lands once CI is green.

One concern per PR. Stay out of breaking public API changes and brand/positioning copy — surface those as notes for a human instead.
