A profile-wide agent.service_tier: fast reaches every new session,
including local llama.cpp ones. The request builders already drop the fast
parameter on routes that do not bill for it, but session.info reported
fast: true whenever the tier was priority. The desktop then kept the Fast
switch visible so it could be turned off, tagged the model row Fast and
appended "· Fast" to the pill for a local model.
session.info now asks resolve_fast_mode_overrides, the gate the request
builders use, before it reports fast. While a model switch is pending, the
new pick decides, because the agent's base URL still belongs to the old
route. service_tier is still reported as stored. The TUI status bar reads
info.fast alone.
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