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The previous fallback (step 3) in GenerateSessionHash hashed system + all messages together, producing a different hash each round as the conversation grew ([a] -> [a,b] -> [a,b,c]). This made fallback sticky sessions ineffective for multi-turn conversations. Implement per-message Trie digest chain matching (reusing Gemini's Trie infrastructure) so that the previous round's chain is always a prefix of the current round's chain, enabling reliable session affinity.