chore: snapshot WIP across dashboard, engine, and core

Bundles staged work-in-progress modifications across multiple packages
(routes, store, agent-instructions, self-healing, QuickEntryBox, etc.)
plus the dashboard theme-data.css preload fix.

Note: an unstaged 621-line deletion in .fusion/memory.md was deliberately
NOT committed — it appears to be an accidental overwrite of architecture
notes and is left in the working tree for review.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/engine/src/self-healing.ts

@@ -365,7 +365,10 @@ export class SelfHealingManager {
 
   async archiveStaleDoneTasks(): Promise<number> {
     try {
-      const tasks = await this.store.listTasks();
+      // Slim listing — we only need id/column/columnMovedAt/updatedAt to decide
+      // staleness. Pulling full task payloads (logs, comments, steps) here used
+      // to drag in tens of MB on busy boards and stalled the maintenance loop.
+      const tasks = await this.store.listTasks({ slim: true });
       const cutoff = Date.now() - SelfHealingManager.AUTO_ARCHIVE_AFTER_MS;
 
       const stale = tasks.filter((t) => {