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/providers/mapillary/sequences.js

@@ -58,12 +58,8 @@ export function createSequences({ state, source, parts }) {
     state.context.notify();
   }
 
-  /**
-   * The cones on the globe: each drawn image's index, billboard and height
-   * (null while clamped), and the mesh cells under them, so a mesh sample
-   * moves only the cones it can affect.
-   */
   const nothingDrawn = () => ({ images: [], cones: [], cells: new Set() });
+  /** Drawn cones, plus the mesh cells under them, so a sample moves only those. */
   let drawn = nothingDrawn();
 
   // The cones skip the depth test: hide the ones behind the globe.
@@ -105,11 +101,8 @@ export function createSequences({ state, source, parts }) {
   }
 
   /**
-   * Heights for the cones in terrain mode (Google 3D at street zoom), so they
-   * stand on the street rather than on roofs and tree tops: bare earth,
-   * refined along the sequence by the sampled Google 3D surface. Null when
-   * draped, or when a terrain height is not cached yet; that fetches the
-   * heights and draws the cones again.
+   * Terrain-mode cone heights on the street, not on roofs: bare earth refined
+   * by mesh samples. Null when draped or while terrain heights are fetched.
    */
   function coneHeights(images, { request = true } = {}) {
     const ground = state.context.groundCaster;
@@ -173,10 +166,8 @@ export function createSequences({ state, source, parts }) {
   }
 
   /**
-   * New mesh samples landed: when any is under a cone, re-place the cones
-   * whose cast height changed, in place. A sample can move a neighbour too
-   * (refineHeights bridges across covered points), so every height is
-   * recomputed (cheap arithmetic) but only moved cones are touched.
+   * Re-place cones whose height new mesh samples changed. A sample can move
+   * a neighbour too, so every height is recomputed but only moved cones touched.
    */
   function onMeshSampled(batch) {
     if (state.context.getSurface?.() !== 'terrain' || !drawn.cones.length)