docs(street-level): shorten docs and comments before merge

Trim the doc text this PR adds (README, CHANGELOG, CURRENT-STATE,
KNOWN-ISSUES, SECURITY, DATA_SOURCES, .env.example, the CI job comment),
drop code comments that restate the code, cut design-note JSDoc to a line
or two, and drop review tags from test names. Comments only; no code
changes.

Also: README key count (seven keys, two metered), CURRENT-STATE's gate
paragraph (CI runs a production build with a dummy token), the stacked
doc above meshBoxInRange and the orphaned inMeshRange line in
coverage.js, and a duplicate ALPR row in DATA_SOURCES that a merge had
brought back.

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

.github/workflows/ci.yml

@@ -60,22 +60,14 @@ jobs:
         run: npm run build
 
   street-level-browser:
-    # The Street Level gate in its hermetic mode, against a production build
-    # served by `vite preview`: coverage tiles, the Graph API and the image
-    # CDN are answered from fixtures (scripts/fixtures/street-level), so no
-    # real token and no Mapillary network are needed, and the whole photo
-    # flow runs. The server gets a dummy, non-secret client token: the build
-    # bakes it into the bundle (the viewer needs one to ask for photos) and
-    # the preview server's status route reports it as configured. The page
-    # intercepts every *.mapillary.com request, so the token never leaves it.
+    # Hermetic: every Mapillary request is answered from fixtures, so the
+    # dummy token below never leaves the page.
     name: Street Level browser gate
     runs-on: ubuntu-latest
     timeout-minutes: 30
     env:
       GEV_REQUIRE_ALLOCATION_GATE: '0'
-      # A header press that misses while the panel stood still is a failure
-      # (the right rail now aligns to where the left rail settles); a miss the
-      # panel's own layout change explains is retried with a ::warning::.
+      # Fail on a missed header press unless the panel itself moved.
       QA_FAIL_ON_RETRY: '1'
     steps:
       - name: Check out source