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]>

build/vite.js

@@ -81,8 +81,7 @@ export function createBrowserViteConfig({
         '@jtarrio/signals/demod/modes.js',
         '@jtarrio/webrtlsdr/rtlsdr.js',
         'egm96-universal',
-        // MapillaryJS is loaded on demand the first time a street-level
-        // image is opened.
+        // Loaded on demand when the first street-level image opens.
         'mapillary-js',
       ],
     },