nftpoetrist 9faaa292b4 fix(delegate): inherit parent fallback_chain in _build_child_agent ...

_build_child_agent constructed child AIAgents without passing
fallback_model, leaving _fallback_chain=[] for every subagent.
When a subagent hit a rate-limit or credential exhaustion the
runtime fallback check (run_agent.py:7486 / 12267) found an empty
chain and failed immediately — even though the parent agent was
configured with fallback_providers and would have recovered.

The cron scheduler already propagates fallback_model correctly
(scheduler.py:1038). Fix closes the parity gap by reading the
parent's _fallback_chain (the normalised list form accepted by
AIAgent's fallback_model parameter) and threading it through.

Empty chains coerce to None so AIAgent initialises _fallback_chain=[]
as usual rather than iterating an empty list.

2026-05-04 01:48:56 -07:00

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