Add proof-driven pull request template

.gitea/PULL_REQUEST_TEMPLATE.md

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+## Summary
+- what changed:
+- why this change exists:
+
+## Linked issue / governing artifact
+- closes #
+- related issue / epic / ADR:
+
+## Acceptance criteria targeted
+- [ ] criterion 1
+- [ ] criterion 2
+
+## Proof
+Describe the exact evidence that proves the acceptance criteria were met.
+
+### Commands / logs / world-state proof
+- command:
+- output / log path / artifact:
+
+### Visual proof (required for UI / visual changes)
+- screenshot link:
+- what it proves:
+
+## Risk and rollback
+- risk:
+- rollback / restore path:
+
+## Checklist
+- [ ] I linked the governing issue / artifact.
+- [ ] I named the acceptance criteria.
+- [ ] I included exact proof, not "looks right".
+- [ ] For visual changes, I linked screenshot proof outside the repo unless explicitly required.
+- [ ] For CLI / config / ops changes, I cited exact command output, log paths, or other world-state evidence.
+- [ ] I noted risks and rollback if this touches live systems.