Allow each scheduled job to pin its provider and model.

New jobs snapshot the current New Session default so quota is predictable.
cron_create inherits the calling session model unless provider+model are set.
The editor lists configured models; the job row shows which model will run.

lib/index.js

@@ -26,13 +26,16 @@ export {
   attachLiveSessionToWorkspace,
   bindModelSelection,
   createHostService,
+  currentDefaultModel,
+  listModelChoices,
   listWorkspaceChoices,
   makeLiveSessionPort,
   resolveDefaultModel,
+  resolveJobModel,
   resolveSessionPlacement,
   waitForAgentTurn,
 } from './host.js'
-export { callerWorkingDirectory, registerCronTools, resolveCreateCwd, scheduleFromArgs } from './tools.js'
+export { callerWorkingDirectory, callerModelSelection, registerCronTools, resolveCreateCwd, resolveCreateModel, scheduleFromArgs } from './tools.js'
 export { decideDispatch, nextFire, parseCron, tickJobs, validateSchedule } from './scheduler.js'
 export {
   applyRunIsolation,
@@ -43,6 +46,7 @@ export {
   workspaceVisibleIds,
 } from './isolation.js'
 export { wrapScheduledPrompt } from './prompt.js'
+export { normalizeJobModel } from './store.js'
 export { claimOccurrence, executeClaimedRun, extractAssistantText, TITLE_PREFIX } from './fire.js'
 
 function loadPkg(id) {