The retry check matched the literal ".git/index.lock", which only ever
appears for the main worktree. A linked worktree's lock is at
.git/worktrees/<name>/index.lock and a submodule's is under its own git
dir, so contention there was never retried. Match the bare "index.lock"
fragment instead, which covers all of them.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
e3ecb77939