Loads the complete conversation history for a given session handle. Reads the latest valid .jsonl or .json event snapshot.
.jsonl
.json
Validated session handle string (e.g. syn_sess_abc123).
syn_sess_abc123
History snapshot, or null if no history exists or cannot be read.
Loads the complete conversation history for a given session handle. Reads the latest valid
.jsonlor.jsonevent snapshot.