feat(agent): add open-ended research methodology

lint

lint

feat: add print logs for memory, search, and tool operations

feat: rate limit resilience + formatter safety + fail-safe hard-caps

fix 3 layer memory ststem

better persistent memory fix

feat: upgrade memory logic to use langmem.create_memory_manager

fixed memory

feat: inject retrieved semantic and episodic memory into system prompt

feat: add episodic task summarization

feat: add semantic memory extraction node using langmem