Several emitState() calls were missing a preceding touchUpdatedAt(),
causing agent state updates to be silently dropped by the bootstrap
dedup logic in session.ts (which drops updates where
updateUpdatedAt <= snapshotUpdatedAt).
This caused two user-visible bugs:
- Permission mode switches not reflected in UI until next message
- Agent stuck showing "running" when it had transitioned to idle
Added touchUpdatedAt() to: setAgentMode, setAgentModel,
setAgentThinkingOption, setLabels, streamAgent.finalize,
replacement error fallback, and cancelAgentRun permission clear.