Previously agents only registered when api_key was missing (first run).
After updating to v3.0 with screenshot capability, restarted agents never
refreshed their capabilities in the DB. Now register() is called every
startup — server does UPDATE on existing agent_id so api_key is preserved.
self_update(cfg) and shell allow_shell_commands check both referenced cfg
from run() scope, but execute_command() is a standalone function. Fixed by
calling load_config() locally in each branch that needs it.
myron