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/ui/panelRails.test.mjs

@@ -357,10 +357,8 @@ test('right rail aligns to the current left rail and excludes hidden obstacles',
   assert.equal(f.stack.dataset.safeTop, '200.0');
 });
 
-// The left pass commits its top and requests this pass in the same frame, but
-// `top` then animates for 150 ms and nothing re-runs the right pass when it
-// lands. CI docked the right rail at 234 px (26vh) while the left settled at
-// 266.4 px (29.6vh). Mid-flight the right rail must read the destination.
+// The left rail's `top` animates after the right pass runs, and nothing
+// re-runs it when the transition lands: the right rail must read the end value.
 function animatingLeftRail({ keyframes = true } = {}) {
   const f = fixture('right');
   const left = f.options.leftStack;