get_community was the only graph tool still returning a bare numeric id, while
get_node and the query-traversal output already render the community_name
attribute to_json writes onto every node. Read the name from the community's
member nodes and put it in the header ("Community 12 — Auth & Sessions"),
sanitised like every other LLM-derived field.
Ported from PR #1448 by @rmart1308 onto current v8, with two additions: the name
is skipped when it is just the "Community N" placeholder (written for unnamed
communities) so the header never doubles to "Community 12 — Community 12", and
the formatting is extracted to a module-level _community_header() with focused
tests (named / placeholder / empty / sanitised). Full suite 2397 passed.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
rmart1308
f9ded63350