chore: Ignore .beads/redirect (location-specific file)

The redirect file points crew/polecat clones to the shared beads.
It's location-specific and regenerated by 'gt prime', so it should
not be tracked in git.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

.gitignore

@@ -29,3 +29,4 @@ gt
 # Runtime state
 state.json
 .runtime/
+.beads/redirect