Add --reset-messages flag to clear agent buffer after each notification
Adds a new CLI option that resets the agent's message buffer after each
notification is processed, making each interaction stateless. This helps
prevent context window overflow and keeps notification responses independent.
Uses the Letta SDK's agents.messages.reset() endpoint with
add_default_initial_messages=True to restore the agent to a clean state
while preserving core memory blocks and archival/recall memory access.
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Co-Authored-By: Letta <noreply@letta.com>