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]>

src/app/layers/streetLevel.js

@@ -5,11 +5,7 @@ import * as picking from '../../data/pickRegistry.js';
 import * as input from '../../data/inputOwnership.js';
 import * as render from '../../renderGovernor.js';
 
-/**
- * Construct the Street Level layer with every imagery provider this build
- * ships, using the application scene owners and the supplied sources. A new
- * provider registers here; its chip, credit and share bit follow.
- */
+/** A new provider registers here; its chip, credit and share bit follow. */
 export function createApplicationStreetLevel({ surface, sources }) {
   return createStreetLevelLayer({
     providers: [createMapillaryProvider({ source: sources.mapillary })],