Adk Cross Session Knowledge Bank

Seeds, queries, and explains Vertex AI Memory Bank cross-session memory for ADK agents: PreloadMemoryTool/LoadMemoryTool recall, generate_memories_callback writes, managed/custom memory topics, and scope-based consolidation. TRIGGER when the user asks to "implement cross-session memory in ADK", "configure Vertex AI Memory Bank", "persist agent knowledge/preferences across conversations", "use PreloadMemoryTool or LoadMemoryTool", or seed/query Memory Bank facts by scope. DO NOT TRIGGER for short-term session state (state["key"]) with no cross-session need, generic RAG/document retrieval corpora, or non-Vertex memory stores (Redis, a custom vector DB) unrelated to Agent En…