Interactive turns no longer die with a raw 'Model call limit of N
reached' error. The final budgeted model call is composed as a wrap-up:
the durable request records wrapUp: true, and the composer strips tools
and appends a notice telling the model to answer with what it has,
state what's unfinished, and mention the limit is configurable in
Settings -> Advanced. The turn then completes normally with that answer.
Headless turns (and a wrap-up call that still emits tool calls) keep
the hard model-call-limit failure so automation retains the
machine-readable outcome; sub-agents already surface partial results.
If a hard limit failure still reaches the chat UI, the error bubble now
explains the limit and points at the setting instead of the raw error.
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