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/data/layerState.test.mjs

@@ -2678,8 +2678,7 @@ test('Street Level: every option round-trips through a share link and stored sta
 });
 
 test('Street Level: the link codec accepts exactly the windows the filter keeps', () => {
-  // The codec's ceiling is the filter's MAX_SINCE_DAYS: a longer window is
-  // rejected (read as "any date"), the longest one is kept whole.
+  // A window past MAX_SINCE_DAYS reads as "any date".
   assert.equal(
     streetLevelOptions(`0.s.${MAX_SINCE_DAYS}`).sinceDays,
     MAX_SINCE_DAYS,