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]>

server/providers/mapillary.js

@@ -1,11 +1,8 @@
 import { installMapillaryRoutes } from './mapillary/routes.js';
 
 /**
- * Vite plugin: Mapillary street-level coverage.
- *
- * Serves cached coverage vector tiles with the Mapillary token added
- * server-side (and the unused z14 image point layer stripped in transit),
- * plus a status route that says whether a token is configured.
+ * Vite plugin: cached Mapillary coverage tiles (token added server-side) and a
+ * status route that says whether a token is configured.
  */
 function mapillaryProxy() {
   return {