FalkorDB RediSearch rejects hyphens in Graphiti group_id

FalkorDB RediSearch rejects hyphens in group_id fulltext queries

When using Graphiti with FalkorDB backend, group_id values containing hyphens (e.g., vault-wiki) cause RediSearch: Syntax error during entity extraction. The hyphen is tokenized by RediSearch’s fulltext parser, breaking the query.

Error: RediSearch: Syntax error at offset 17 near vault when processing episodes with group_id: "vault-wiki"

Fix: Use underscores instead of hyphens in all Graphiti group_ids. vault_wiki works, vault-wiki fails.

Affected components: Any Graphiti add_memory call, deferred queue processor, session-close Graphiti dual-writes.

Convention: All Graphiti group_ids must use underscores: vault_wiki, sessions, decisions, oracle.