build: v0.4.55 release with Phase 3+4 features

Phase 3: message search, social drafting pipeline, budget alerts
Phase 4: actionable notifications, cross-platform build validation

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "agent-company",
-  "version": "0.4.54",
+  "version": "0.4.55",
   "private": true,
   "type": "module",
   "description": "Cross-platform Electron desktop control plane for local-first AI agent companies.",