When COLIBRI_SCREENSHOT_DIR is set, the daemon generates a UUID via
uuidgen, spawns a screenshot command (COLIBRI_SCREENSHOT_CMD, default
'import -window root'), and attaches the UUID to the mother cost push.
The dashboard already renders ▸ proof badges on cards with screenshot_uuid.
This closes the loop — the daemon now auto-generates screenshots instead
of waiting for an external process to set COLIBRI_TASK_SCREENSHOT_UUID.
Sam & Hermes