thrunt-pr-branchlisted

<objective> Create a clean branch suitable for pull requests by filtering out .planning/ commits from the current branch. Reviewers see only code changes, not THRUNT planning artifacts. This solves the problem of PR diffs being cluttered with PLAN.md, SUMMARY.md, STATE.md changes that are irrelevant to code review. </objective> <execution_context> @.github/thrunt-god/workflows/pr-branch.md </execution_context> <process> Execute the pr-branch workflow from @.github/thrunt-god/workflows/pr-branch.md end-to-end. </process>