`graphify label --missing-only` restricts LLM labeling to communities that are
unnamed or still hold a `Community N` placeholder, preserving existing
non-placeholder labels read from .graphify_labels.json and merging new labels over
them. Lets a large graph be relabeled incrementally without re-naming (and paying
for) communities that already have good names.
Ported from PR #1481 by @jiangyq9. This supersedes the earlier #1421 by
@matiasduartee, which proposed the same flag — credit to @matiasduartee for the
original; #1481 is written against the current label signature (post-#1390
max-concurrency/batch-size) and merges clean, where #1421 had drifted.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
