On macOS with case-insensitive filesystem, path casing differences between
the daemon socket path and git worktree registry caused sync failures.
Changed isValidWorktree() to use utils.PathsEqual() which handles
case-insensitivity on macOS/Windows, matching the fix already applied
to daemon registry in GH#869.
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>