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/layers/streetLevel/state.js

@@ -1,9 +1,8 @@
 import { FILTER_DEFAULT } from './policy.js';
 
 /**
- * The open image's fields of `state.street`, as they are with no image open.
- * Closing the viewer resets exactly these; the panel host, the render mode
- * and whether following is available outlive any one image.
+ * The per-image fields of `state.street` with no image open; closing resets
+ * exactly these (host, render mode and follow availability outlive an image).
  */
 export function freshStreet() {
   return {