generate_image was registered as a custom tool and force-activated via the alwaysInclude list in createAgentSession, so it survived --no-tools (empty toolNames) and any explicit whitelist that omitted it. There was also no generate_image.enabled setting, so /settings had no toggle.
Add a generate_image.enabled setting and only register the tool when enabled and either no whitelist is given or it names generate_image.
Fixes#5305
roboomp
5878ed8f49