hapi

Halt the workflow because a load-bearing assumption (about scope, schema, source content, or constraints) needs to be revised before any further work can ship. Creates a marker file that blocks subsequent `git push`, `git commit`, `gh pr create`, and `gh pr merge` until the user reviews and resolves it. Use when you're about to invent a slip-workaround for an assumption that's wrong instead of surfacing the conflict.

After pushing to a PR branch, arm a Monitor that notifies on any new review (any reviewer, first review or re-review) landing on the current HEAD commit. Filters out reviews already present at invocation time so only genuinely new reviews fire.