Update checker: only cache registry latest version, always check installed
version fresh — fixes false "0.0.3 → 0.0.4" banner after upgrading.
Skill sync: use git status --porcelain for dirty detection (catches untracked
files), stash with --include-untracked, abort stale rebase on pull failure,
and print tip directing users to skills-local/ for persistent customizations.
Bump @mosaic/mosaic and @mosaic/cli to 0.0.5.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
