Retrieve memories relevant to a query. Retrieve relevant memories about the user's preferences, past instructions, and known facts. Call this when persistent context would help answer the current request. Returns a list of memories with their IDs.

Stage 1 of two-stage recall (progressive disclosure). Returns a COMPACT index of relevant memories (id + short summary + score) — cheap to scan. Use this first, then call memory_get on the IDs you want, instead of re-reading source files.

Stage 2 of two-stage recall. Returns the FULL content of one memory PLUS its connected graph neighbourhood (related facts) — the 'connected region'. Use after memory_search to pull depth on demand without re-reading files.

Store a new memory about the user. Use when you learn a new fact, preference, instruction, past failure, or successful strategy. Does not conflict with any memory returned by recall_memory.

Merge or replace an existing memory by its ID. Use when a recalled memory is outdated (replace) or when new info adds detail to an existing memory (merge — write the combined sentence as new_content).