feat(slice4): metadata sidecar git read/write helpers — dual-read + lazy-migrate ops (§22.4a)
apply_values, EntryGitState, read_entry_from_git, write_entry_files, sidecar_path_for. Plus the SLICE-4 implementation plan. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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