When creating or repairing worktrees, if AGENTS.md doesn't exist after
checkout (e.g., stale fetch or local-only file), copy it from mayor/rig.
This ensures polecats always have the critical "land the plane" instructions.
Applied to both AddWithOptions and RepairWorktreeWithOptions for
consistency. Errors are non-fatal (warning only).
Fixes: gt-sq1.2
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>