Splits .drone.yml into a push-triggered self-test pipeline and a custom-triggered
recipe-ci pipeline. The bridge fires event=custom builds with RECIPE/REF/PR/SRC
params; recipe-ci runs the shared harness (install/upgrade/backup + recipe-local)
with STAGES set and CCCI_JANITOR_MAX_AGE=0 (safe at capacity=1), concurrency limit 1.
Connects the verified !testme trigger to actual recipe CI (D2/D10 path).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>