feat: implemented verified Shell Actuator skill

- Enabled execution of whitelisted shell commands via OACP.
- Added neuro-cognitive analysis for command results.
- Fixed authentication fallback for background daemon.
- Finalized Emacs UI robustness for all message types.

start-agent.sh

@@ -0,0 +1,4 @@
+#!/bin/bash
+export SKILLS_WHITELIST="org-skill-shell-actuator,org-skill-chat,org-skill-emacs-bridge,org-skill-object-store-persistence"
+cd /home/user/memex/projects/org-agent
+./org-agent-server > /home/user/memex/org-agent-whitelist.log 2>&1