Tighten coverage prompt comments and docs

src/data/lifecycle.js

@@ -2393,9 +2393,8 @@ export class LayerLifecycle {
   }
 
   /**
-   * A tick's failure belongs to the feed it polled. Once the layer's own stats
-   * stop reporting one (the camera left that feed), the row stops showing it
-   * instead of waiting for the next tick.
+   * Drop a tick failure the layer's stats no longer report (the camera left
+   * that feed) instead of showing it until the next tick.
    */
   _dropRecoveredRefreshError(layerId) {
     const entry = layerId ? this.layers.get(layerId) : null;

src/layers/bikeshare/controls.js

@@ -15,8 +15,7 @@ export function createControls({ state: layerState, services, parts, source }) {
     updateInterval: STATUS_POLL_MS,
 
     /**
-     * Keep the manager so camera-driven coverage changes can repaint the row
-     * before the next status poll.
+     * Kept so camera moves can repaint the row before the next status poll.
      * @param {object} dataManager DataLayerManager instance.
      */
     attachDataManager(dataManager) {
@@ -84,18 +83,16 @@ export function createControls({ state: layerState, services, parts, source }) {
         lastUpdate: layerState._lastUpdate,
         loading,
       };
-      // No system in range is guidance, not an empty feed: the camera is too
-      // high, or no catalogued system is near the view. A city that failed
-      // leaves range empty too, and reports its failure below instead.
+      // No system in range: the camera is too high or no system is near. A
+      // failed city also leaves range empty and reports its failure below.
       if (
         layerState._enabled &&
         !loading &&
         layerState._activeCityIds.size === 0 &&
         layerState._failedCityIds.size === 0
       ) {
-        // English data (the analyst's empty note to the model, and the Layers
-        // row's prompt); both show it through translateStatusMessage
-        // (ui/statusText.js).
+        // English: the analyst's empty note and the row's prompt, both shown
+        // through translateStatusMessage (ui/statusText.js).
         const note = layerState._altitudeGateEnabled
           ? `No bike share here yet · ${GBFS_CITY_REGISTRY.length} systems available`
           : `Fly below ${Math.round(ACTIVATION_ENTER_ALTITUDE_M / 1000).toLocaleString('en-US')} km to a covered city`;

src/layers/bikeshare/coverageStatus.test.mjs

@@ -1,10 +1,7 @@
 // BIKESHARE COVERAGE STATUS — a view with no system says so.
 //
-// Over a city with no catalogued system (London, Tokyo) the layer drew nothing
-// and reported nothing, so its row read "ON · — · GBFS · never": the same as a
-// feed that had never answered. These cases pin the rule that replaced it:
-// with no system in range the layer reports a guidance status that says why,
-// and a view it left keeps no date for data it no longer draws.
+// With no system in range (London, Tokyo) the layer says why instead of
+// "never", and keeps no date for data it no longer draws.
 //
 // Run with: npm test
 import { test } from 'node:test';

src/layers/bikeshare/rowRepaint.test.mjs

@@ -1,5 +1,3 @@
-// Bike Share row repaints: entering a city, leaving it or nudging the camera
-// mid-load, and leaving a failed city.
 // Bike Share: after the camera settles, the last row the panel painted must
 // match what the layer reports now. Each case drives the real viewport,
 // ingestion, rendering and controls; the manager is a spy that records the

src/layers/bikeshare/viewport.js

@@ -116,10 +116,7 @@ export function createViewport({ state: layerState, services, parts, source }) {
     parts.rendering.removeCityPoints(cityId);
   }
 
-  /**
-   * Repaint the layer's row now. Its text follows the camera (coverage
-   * prompt, station count), and the manager tick is 60 s.
-   */
+  /** Repaint the row now: it follows the camera, the manager tick is 60 s. */
   function refreshRow() {
     layerState._dataManager?.refreshLayerStats?.('bikeshare');
   }

src/layers/promptRepaint.test.mjs

@@ -1,7 +1,5 @@
-// When the camera changes which coverage prompt a Transit or
-// Bike Share row shows, the layer asks the panel to repaint at once, instead
-// of leaving the old prompt up until the manager's next tick (Transit 15 s,
-// Bike Share 60 s).
+// A camera move that changes a Transit or Bike Share coverage prompt repaints
+// the row at once, not at the next manager tick (15 s, 60 s).
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { createState as createBikeState } from './bikeshare/state.js';

src/layers/transit/gatePrompt.test.mjs

@@ -1,7 +1,5 @@
-// The Transit coverage prompt names the altitude the closed gate
-// actually opens at. Descending over Boston to 2,900 km (below 3,000 km, above
-// the 2,850 km enter threshold) loads nothing, so a prompt "Fly below 3,000 km"
-// asks for something the camera has already done.
+// The Transit prompt names the altitude the gate opens at: at 2,900 km over
+// Boston (under 3,000 km, above the 2,850 km enter threshold) nothing loads.
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import { createState } from './state.js';

src/layers/transit/queries.js

@@ -245,9 +245,8 @@ export function createQueries({ state, parts }) {
       const health = aggregateTransitFeedHealth(statuses, now);
       const count = state._vehicles.size;
       if (state._enabled && active.length === 0) {
-        // English data (the analyst's empty note to the model, and the Layers
-        // row's prompt); both show it through translateStatusMessage
-        // (ui/statusText.js).
+        // English: the analyst's empty note and the row's prompt, both shown
+        // through translateStatusMessage (ui/statusText.js).
         const note = state._altitudeGateOpen
           ? `No feed here yet · ${TRANSIT_REGION_COUNT} regions available`
           : `Fly below ${Math.round(ACTIVATION_ENTER_ALTITUDE_M / 1000).toLocaleString('en-US')} km to a covered region`;

src/layers/transit/viewport.js

@@ -111,8 +111,7 @@ export function createViewport({ state, services, parts }) {
         changed = true;
       }
     }
-    // Leaving coverage leaves nothing on the map to date: a row that read
-    // "26s ago" over an empty view would claim a feed that is no longer here.
+    // Nothing is left on the map to date.
     if (desired.size === 0) state._lastUpdate = null;
     for (const [feedId, feed] of desired) {
       if (!state._activeFeeds.has(feedId)) {
@@ -124,8 +123,7 @@ export function createViewport({ state, services, parts }) {
     parts.ingestion.sweepAgedVehicles(Date.now());
     parts.rendering.syncRenderHold();
     governorRequestRender('transit-proximity');
-    // The row's text follows the camera (coverage prompt, feed list), so it
-    // repaints now instead of at the next 15 s manager tick.
+    // Repaint now: the row follows the camera, the manager tick is 15 s.
     if (changed) state._dataManager?.refreshLayerStats?.('transit');
   }
 

src/ui/statusText.js

@@ -269,10 +269,8 @@ export function translateStatusLine(text) {
 /** Thousands separators out of an English number ("3,000" → 3000). */
 const englishNumber = (text) => Number(text.replace(/,/g, ''));
 
-// Coverage notes of a layer whose view has no feed, whole lines with a number
-// in them: transit (transit/queries.js) and bikeshare (bikeshare/controls.js).
-// Their " · " is part of one sentence, so they are matched before the line is
-// split into pieces. Keep these in step with the producers.
+// Coverage notes (transit/queries.js, bikeshare/controls.js). Their " · " is
+// inside one sentence, so they match whole before the line is split.
 const COVERAGE_NOTE_PATTERNS = [
   [
     /^Fly below ([\d,]+) km to a covered region$/,