◇ Could this help me?
Yes. A per-user memory store written during normal conversation and read at the start of the next one is the correct shape for persistent personalization, and it is far better than the two common alternatives, which are asking the user to restate everything or keeping one enormous shared context. Working from the vendor's own cookbook is also the right instinct, since first-party examples stay current with the platform in a way that reshared tutorials do not. General practice, with the design caution the caption does not raise: scoping is the whole safety story for this pattern, because a store keyed incorrectly exposes one user's remembered details to another, and a write path with no rule about what it refuses to keep will eventually persist something that should not have been stored.
Help me implement per-user memory for an agent, working from the vendor's published cookbook rather than from memory. First walk me through the pattern: where the store lives, how it is keyed per user, when it is written during a conversation, and when it is read. Then design the two rules that matter most: what the write path is allowed to persist and what it must refuse to keep even if the user mentions it, and how the key is derived so that one user's memory can never be read in another user's session. Show me how I would test both of those failing before I trust the implementation, and tell me what the cookbook example leaves out that a real deployment needs.