feat(2w): W2 WC7 trigger surface — bridge parses !testme --quick

bridge/bridge.py: parse_trigger(body) → (is_trigger, quick); accepts exactly
'!testme' (cold, default) and '!testme --quick' (opt-in fast lane), rejects
'!testmexyz'/'!testme foo'/etc. Threaded through both poll + webhook paths and
process_testme → trigger_build adds the CCCI_QUICK=1 Drone param (auto-exposed
to run_recipe_ci). PR comment labels a quick run lower-confidence. .drone.yml
echoes quick=. +3 unit tests (incl. the !testmexyz negative). 64 unit pass.
WC7: default !testme stays full cold; --quick opt-in, never gates merge.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.drone.yml

@@ -64,6 +64,8 @@ steps:
       # means no concurrent build shares /root/.abra.
       HOME: /root
     commands:
-      # RECIPE/REF/PR/SRC are injected as env vars from the build's custom params.
-      - 'echo "recipe-ci: RECIPE=$RECIPE REF=$REF PR=$PR SRC=$SRC stages=$STAGES"'
+      # RECIPE/REF/PR/SRC (+ CCCI_QUICK for `!testme --quick`) are injected as env vars from the
+      # build's custom params. CCCI_QUICK=1 makes run_recipe_ci take the opt-in fast lane (WC7);
+      # absent => full cold (default). run_quick ignores STAGES (always upgrade+custom).
+      - 'echo "recipe-ci: RECIPE=$RECIPE REF=$REF PR=$PR SRC=$SRC stages=$STAGES quick=${CCCI_QUICK:-0}"'
       - cc-ci-run runner/run_recipe_ci.py