Edit Mnemopi long-term memories by id.

Use only with ids returned by the recall tool. Operations:

• update: replace content and/or importance for a working memory.
• forget: permanently delete a working memory.
• invalidate: softly supersede a working or episodic memory, optionally pointing at replacement_id.

Prefer invalidate when a memory became stale but its history may still be useful. Use forget only for content that should be hard-deleted.