Three changes to prevent infinite re-execution loops when a user sends
a new message while long-running tools are executing:
1. Filter interrupted tool results in _build_gateway_agent_history:
skip tool messages whose content contains [Command interrupted] or
exit_code 130 — they represent partial execution, not valid results.
2. Don't replay auto-continue notes as user messages: detect
gateway-injected [System note: ...] / [IMPORTANT: ...] prefixes
and skip them in _build_gateway_agent_history so the LLM doesn't
see 4+ messages from 'the user' telling it to finish old work.
3. Fix the wording: the system note now instructs the model to
address the user's NEW message FIRST, IGNORE pending results,
and NOT re-execute old tool calls.
Closes#45230
5191c1c2ce