cluster-only re-runs Leiden clustering and then re-applies the existing
.graphify_labels.json by raw cid index, which causes labels to attach to
clusters whose members are unrelated to the label's original meaning
whenever the graph has changed between labeling and re-clustering.
Mirror the safety net already present in watch.py:_rebuild_code added in
#822 for the watch/update paths.
Adds a regression test that fails without the fix (label cids become
orphaned from graph.json community attributes after re-clustering).
Refs: #1027
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Leon GyeongMan BaekandClaude Opus 4.7
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