Add overlay directory support to automatically copy gitignored files
(like .env, config files) from <rig>/.runtime/overlay/ to polecat
and crew worktree roots when they are spawned.
This allows services started by polecats/crew to have their required
configuration files at the root without committing them to git.
Changes:
- Add copyOverlay() function to polecat and crew managers
- Call copyOverlay() after setupSharedBeads() in AddWithOptions/RepairWorktreeWithOptions
- Non-fatal: overlay copy failures only log warnings, don't block spawn
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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