Summary

Improves performance when opening repositories that have multiple worktrees by intelligently sharing Git data across worktrees.

Impact

• Shares cached Git data (tags, remotes, stashes, contributors) across worktrees of the same repository, eliminating redundant Git operations
• Pre-populates branch cache from branch list to avoid redundant rev-parse operations
• Correctly handles worktree-specific state (like "current" branch flag) while sharing underlying data
• Consolidates caches into a single structure with improved invalidation logic
• Improves worktree naming for detached states by including folder context
• Excludes worktrees from certain repository pickers where inappropriate

Validation

• Test with multiple worktrees from the same repository
• Verify branch detection shows correct current branch per worktree
• Check that tag/remote/stash data is consistent across worktrees
• Confirm cache invalidation propagates correctly

Risk

Medium - Core caching infrastructure changes. Unit tests added for cache behavior.