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Conversation memory and long-term facts

Add short-term memory with a checkpointer so each chat thread remembers earlier turns ('and what about last month?'). Add long-term memory with a store for facts that last across chats (e.g. 'preferred supplier for rice is X', 'always show amounts in lakhs'). Keep long chats within the context limit by trimming or summarising old messages.

Builds on: 4.4 Generate the answer