feat: configure supervisor model and story graph use per conversation

Add a supervisor text-model selector using existing connections and a per-conversation story graph switch above knowledge settings. Hide the switch when Supervisor is disabled and enforce conversation preferences at local and remote tool execution boundaries.

Release note: Choose a dedicated supervisor model and control whether each conversation can query existing stories and experiences. Enabling graph access does not start a review or automatically insert context.

src/shared/application-settings-contracts.ts

@@ -73,6 +73,7 @@ const applicationPreferencesSchema = z
     heartbeatReportTimeoutSeconds: supervisionTimeoutSecondsSchema.optional(),
     supervisorOrganizeTimeoutSeconds: supervisionTimeoutSecondsSchema.optional(),
     supervisorModelConcurrency: supervisorModelConcurrencySchema.optional(),
+    supervisorModelProfileId: z.string().uuid().nullable().optional(),
     supervisionReview: supervisionReviewSettingsSchema.optional(),
     magicNotesShowIncompleteTodoCount: z.boolean().default(true),
     magicNoteCommentMode: magicNoteCommentModeSchema.default('immediate'),

src/shared/assistant-contracts.ts

@@ -620,6 +620,7 @@ export const conversationSnapshotSchema = z
     knowledgeLibraryIds: z.array(assistantIdSchema).max(20).optional(),
     workMode: workModeSchema.optional(),
     knowledgeRetrievalMode: z.enum(['auto', 'always']).optional(),
+    storyGraphEnabled: z.boolean().optional(),
     contextMetrics: conversationContextMetricsSchema.optional(),
     contextCompressionState:
       conversationContextCompressionStateSchema.optional(),
@@ -671,6 +672,11 @@ export const conversationSetPinnedSchema = z.object({
   pinned: z.boolean()
 }).strict()
 
+export const conversationSetStoryGraphSchema = z.object({
+  conversationId: assistantIdSchema,
+  enabled: z.boolean()
+}).strict()
+
 export type ConversationSetPinnedInput = z.infer<
   typeof conversationSetPinnedSchema
 >

src/shared/contracts.ts

@@ -2100,6 +2100,7 @@ export type DesktopApi = {
     replace: (conversations: ConversationSnapshot[]) => Promise<void>
     saveLocal: (batch: LocalConversationSaveBatch) => Promise<void>
     setPinned: (input: ConversationSetPinnedInput) => Promise<void>
+    setStoryGraph: (input: { conversationId: string; enabled: boolean }) => Promise<void>
     branchLocal: (
       input: ConversationBranchInput
     ) => Promise<ConversationSnapshot>

src/shared/ipc-channels.ts

@@ -228,6 +228,7 @@ export const ipcChannels = {
   conversationsReplace: 'conversations:replace',
   conversationsSaveLocal: 'conversations:save-local',
   conversationsSetPinned: 'conversations:set-pinned',
+  conversationsSetStoryGraph: 'conversations:set-story-graph',
   conversationsBranchLocal: 'conversations:branch-local',
   conversationsDeleteLocal: 'conversations:delete-local',
   conversationsChanged: 'conversations:changed',