Replace fragile stash/pop approach with intelligent migration:
when mosaic sync detects dirty files in the skills repo, it
identifies which skills were edited, copies them to skills-local/
(which takes precedence during linking), then resets the repo clean
so git pull always succeeds. User edits are never lost.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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