docs(street-level): drop stale provider and stepping wording; the gate fails when it cannot park

Co-Authored-By: Claude Opus 5.5 <[email protected]>

CONTRIBUTING.md

@@ -66,8 +66,9 @@ gate for the feature you changed.
 > **CI does not cover this for you.** The workflow runs the setup policy
 > checks, the formatting and package-boundary checks, the unit suite and the
 > production build, plus a Windows onboarding job. It runs neither
-> `npm run test:track` nor any `qa-*.mjs` gate — both need a live dev server
-> and a browser. Include the applicable local run in your PR's validation
+> `npm run test:track` nor any other `qa-*.mjs` gate — both need a live dev
+> server and a browser. The one exception is the hermetic Street Level fixture
+> gate (`street-level-browser` job). Include the applicable local run in your PR's validation
 > evidence.
 
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