fix: rename all packages from @mosaic/* to @mosaicstack/*

- Updated all package.json name fields and dependency references
- Updated all TypeScript/JavaScript imports
- Updated .woodpecker/publish.yml filters and registry paths
- Updated tools/install.sh scope default
- Updated .npmrc registry paths (worktree + host)
- Enhanced update-checker.ts with checkForAllUpdates() multi-package support
- Updated CLI update command to show table of all packages
- Added KNOWN_PACKAGES, formatAllPackagesTable, getInstallAllCommand
- Marked checkForUpdate() with @deprecated JSDoc

Closes #391

apps/gateway/src/__tests__/cross-user-isolation.test.ts

@@ -18,13 +18,13 @@
  */
 
 import { afterAll, beforeAll, beforeEach, describe, expect, it } from 'vitest';
-import { createDb } from '@mosaic/db';
-import { createConversationsRepo } from '@mosaic/brain';
-import { createAgentsRepo } from '@mosaic/brain';
-import { createPreferencesRepo, createInsightsRepo } from '@mosaic/memory';
-import { users, conversations, messages, agents, preferences, insights } from '@mosaic/db';
-import { eq } from '@mosaic/db';
-import type { DbHandle } from '@mosaic/db';
+import { createDb } from '@mosaicstack/db';
+import { createConversationsRepo } from '@mosaicstack/brain';
+import { createAgentsRepo } from '@mosaicstack/brain';
+import { createPreferencesRepo, createInsightsRepo } from '@mosaicstack/memory';
+import { users, conversations, messages, agents, preferences, insights } from '@mosaicstack/db';
+import { eq } from '@mosaicstack/db';
+import type { DbHandle } from '@mosaicstack/db';
 
 // ─── Fixed IDs so the afterAll cleanup is deterministic ──────────────────────