[COG-1325] Integrate Brute-Force Triplet Search into Search with Entity Extraction

[lxobr]

Integrate the brute-force triplet search into the search with entity extraction.

• Implement context retrieval based on brute-force triplet search.

• Perform one search for each entity, then aggregate.

• Ensure that only one memory projection happens during the search.

• Allow for two triplet-to-string options: summarization and direct.

Follow up to: COG-1318

Possibly related: COG-1053

_{From SyncLinear.com | COG-1325}