fix(sync): honor per-spoon auto-sync settings

packages/backend/convex/migrations.ts

@@ -0,0 +1,25 @@
+import { v } from 'convex/values';
+
+import { internalMutation } from './_generated/server';
+
+// One-shot backfill: preserve existing automatic fast-forward behavior for
+// GitHub spoons now that refreshes honor autoSyncEnabled. Idempotent.
+export const backfillAutoSyncDefaults = internalMutation({
+  args: {},
+  returns: v.object({ updated: v.number() }),
+  handler: async (ctx) => {
+    const settings = await ctx.db.query('spoonSettings').collect();
+    let updated = 0;
+    for (const row of settings) {
+      if (row.autoSyncEnabled) continue;
+      const spoon = await ctx.db.get(row.spoonId);
+      if (spoon?.provider !== 'github') continue;
+      await ctx.db.patch(row._id, {
+        autoSyncEnabled: true,
+        updatedAt: Date.now(),
+      });
+      updated += 1;
+    }
+    return { updated };
+  },
+});