Addresses the three gate-review blockers on #6113:
- Fallback attribution: read the served model from agent.model AFTER the
run (the agent mutates it when a fallback fires) instead of the pre-run
resolved_model, for both the persisted _usedModel and SSE used_model.
- Gateway double-label: suppress the additive chip whenever
_gatewayRouting is present, and pass msg._usedModel to
_formatGatewayModelLabel as its model fallback when routing omits
used_model.
- Transparent double-label: skip the generic .msg-used-model-inline chip
when the transparent turn footer owns the model label (.lf-model).
Also per Greptile: settled footer now orders the model chip after the
duration (elapsed - model - ...) to match the transparent footer, and the
test file gains its trailing newline.
b3nw
9bf876598d