Two switch-time regressions from the multi-profile rail work:
- "Session not found" (4007): pruneSecondaryGateways idle-reaps a
non-active profile's backend; switching back respawns a *fresh*
backend that mints new runtime ids, but runtimeIdByStoredSessionId is
never pruned. resumeSession's cache fast-path then makes a dead runtime
id active and returns, so session.usage + the next prompt 404. Probe
the cached id; on rejection drop the stale mapping and fall through to
a full resume that rebinds a live id.
- "Forgets the LLM setting": $currentModel is a nanostore set only by
refreshCurrentModel (gatewayState->open, etc). A swap fires
invalidateQueries() (react-query only) and keeps the socket 'open', so
the model/pill kept showing the previous profile. Re-pull both when
$activeGatewayProfile changes.
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