[tannerpolley]

Paused issues that were stuck on something outside their scope stayed Paused, with nothing recording the blocker.

• propose_issue_change gains a blocked_by operation (add/remove) through the existing issue-change path: GitHub addBlockedBy/removeBlockedBy, Forgejo issue dependencies. Same approval policy, conflict checks and lost-response recovery as sub_issue.
• Managed implementors and issue owners are told: when an outside blocker stops them, create an issue for it, link it with blocked_by, and end with a final result naming it. Not for owner questions or failing tests within scope.
• The issue then shows Blocked; closing the blocker returns it to Paused.
• Agent-context budget 72,456 → 72,539 bytes (measured). Free eval --context/--dry-run checks pass; paid evals not run.

Closes #267

Implemented by GPT-6.1 Sol (Codex) in T3 Code; reviewed by Claude Opus 5.5.

🤖 Generated with Claude Code