feat(owner): auto-apply owner profile after pull sync and CLI import

PullEngine gains an onSessionImported hook (hook errors never fail the
pull), wired in both the CLI server and Electron main to silently fill
session owner from the stored platform profile. The chatlab import CLI
command does the same after a successful import.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/sync/src/pull-engine.ts

@@ -120,6 +120,12 @@ export interface PullEngineOptions {
   logger?: SyncLogger
   /** Return true when an import is already in progress (skip pull) */
   isImporting?: () => boolean
+  /**
+   * Called after a pull session completes successfully with the local session ID.
+   * Used for post-import side effects (e.g. applying the platform owner profile).
+   * Errors thrown by the hook never fail the pull.
+   */
+  onSessionImported?: (localSessionId: string) => void
 }
 
 export class PullEngine {
@@ -129,6 +135,7 @@ export class PullEngine {
   private dsManager: DataSourceManager
   private logger: SyncLogger
   private isImporting: () => boolean
+  private onSessionImported?: (localSessionId: string) => void
   private pullingSourceIds = new Set<string>()
   private progressMap = new Map<string, PullProgress>()
 
@@ -139,6 +146,7 @@ export class PullEngine {
     this.dsManager = options.dsManager
     this.logger = options.logger ?? NOOP_LOGGER
     this.isImporting = options.isImporting ?? (() => false)
+    this.onSessionImported = options.onSessionImported
   }
 
   getProgress(): PullProgress[] {
@@ -372,6 +380,13 @@ export class PullEngine {
       if (totalNewMessages > 0) this.notifier.onSessionListChanged()
       this.notifier.onPullResult(sourceId, sess.id, 'success', `+${totalNewMessages} messages`)
       this.markProgressDone(sess.id)
+      if (this.onSessionImported && sess.targetSessionId) {
+        try {
+          this.onSessionImported(sess.targetSessionId)
+        } catch (hookErr) {
+          this.logger.warn(`[Pull] onSessionImported hook failed for "${sess.name}": ${hookErr}`)
+        }
+      }
       return { success: true, newMessageCount: totalNewMessages }
     } catch (error: any) {
       const errMsg = error.message || 'Pull failed'