fix: escape RediSearch special characters in group_id fulltext queries

[StephenBadger]

Summary

• Group IDs containing hyphens or other RediSearch special characters (e.g. "my-group", "ap-erp") cause RediSearch: Syntax error in FalkorDB fulltext search queries
• The hyphen - is interpreted as the RediSearch NOT operator rather than a literal character, even when the value is double-quoted
• Error manifests as: RediSearch: Syntax error at offset 14 near ap

Fix

• Added _escape_redisearch_value() helper that backslash-escapes RediSearch special characters (,.<>{}[]"':;!@#$%^&*()-+=~?|/\) before interpolating group_ids into fulltext query strings
• Applied the fix to both query builder locations:
  • _build_falkor_fulltext_query() in search_ops.py (used by FalkorSearchOperations)
  • FalkorDriver.build_fulltext_query() in falkordb_driver.py (used by search_utils.fulltext_query() fallback path)

Before/After

# Before: RediSearch syntax error
(@group_id:"ap-erp") (search terms)

# After: properly escaped
(@group_id:ap\-erp) (search terms)

Reproduction

1. Create a Graphiti instance with FalkorDB
2. Ingest data with group_id="my-group" (any group_id containing a hyphen)
3. Call search_() or search() with group_ids=["my-group"]
4. Observe RediSearch: Syntax error

[danielchalef]

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[StephenBadger]

I have read the CLA Document and I hereby sign the CLA

[StephenBadger]

recheck

[Onebrownsound]

Independently, I encountered this quirk and this looks to be the fix I'd do. I'd add a small test case asserting the stripping behavior other than that I'd approve.