diff --git a/CHANGELOG.md b/CHANGELOG.md
index 744451e76..1cff5f3a3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -71,16 +71,14 @@
   proposed diagnosis in #927, and [kvnloo](https://github.com/kvnloo) for identifying
   the repair race. Windows/Claude Desktop Cowork confirmation remains outstanding.
 
-- Street Level: Mapillary street-level imagery modelled on the iD editor's
-  photo overlay (free client token, CC BY-SA 4.0 imagery). A docked right-rail
-  panel holds an ON/OFF pill, 360°/flat and captured-since filters, a legend
-  and an embedded viewer with full-screen EXPAND and FIT/FILL. Coverage lines
-  (below 60 km) and image cones drape on the terrain and Google 3D tiles;
+- Street Level: Mapillary street-level imagery (free client token, CC BY-SA
+  4.0). A right-rail panel holds an ON/OFF pill, 360°/flat and captured-since
+  filters, a legend and an embedded viewer with EXPAND and FIT/FILL. Coverage
+  lines (below 60 km) and image cones drape on terrain and Google 3D tiles;
   opening a photo frames it with one camera flight. Share links carry the
   switch, the filters and the panel's collapsed state. A server proxy adds the
-  token to coverage-tile requests, trims the tiles and caches them in memory
-  for 24 h; it refuses cross-site requests and upstream redirects, rate-limits
-  per IP and runs at most six Mapillary fetches at once. The panel reads
+  token to coverage tiles, trims and caches them for 24 h, refuses cross-site
+  requests and redirects, and limits load per IP and upstream. The panel reads
   KEY REQUIRED without a token and KEY REJECTED when Mapillary refuses it.
 
 - Add Norway's road cameras from Statens vegvesen as a CCTV pack. The camera
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 6ff596696..7e1adaf67 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -66,10 +66,9 @@ gate for the feature you changed.
 > **CI does not cover this for you.** The workflow runs the setup policy
 > checks, the formatting and package-boundary checks, the unit suite and the
 > production build, plus a Windows onboarding job. It runs neither
-> `npm run test:track` nor any other `qa-*.mjs` gate — both need a live dev
-> server and a browser. The one exception is the hermetic Street Level fixture
-> gate (`street-level-browser` job). Include the applicable local run in your PR's validation
-> evidence.
+> `npm run test:track` nor any `qa-*.mjs` gate except the Street Level fixture
+> gate (`street-level-browser` job) — they need a live dev server and a
+> browser. Include the applicable local run in your PR's validation evidence.
 
 ## Share-link layer tokens
 
diff --git a/docs/CURRENT-STATE.md b/docs/CURRENT-STATE.md
index 8213c4859..da9d7027b 100644
--- a/docs/CURRENT-STATE.md
+++ b/docs/CURRENT-STATE.md
@@ -3028,9 +3028,8 @@ Street Level is a docked, collapsible right-rail panel (`#street-level-panel`,
 layer token `0`, option owner `street-level`, panel `ui` token `t`) that starts
 collapsed. It opens itself only when the user, voice or a tool switches the
 layer on or a photo opens, never on a restore, and those opens are not stored.
-Like the iD editor's photo overlay it shows Mapillary only: 360°/flat and
-captured-since filters (relative days, so a link keeps its meaning), one
-embedded viewer and an on-globe credit while the layer is on. Share options:
+It has 360°/flat and captured-since filters (relative days, so a link keeps
+its meaning), one embedded viewer and an on-globe credit while the layer is on. Share options:
 `m` (Mapillary on/off; off draws nothing), `p` (`a`/`p`/`f` panoramas), `s`
 (since, days). The header pill is the only layer switch.
 
@@ -3047,9 +3046,8 @@ pauses them for its Retry-After.
 The server proxy (`server/providers/mapillary.js`) adds the token to
 coverage-tile requests (the browser holds it too, for MapillaryJS and the Graph
 API), serves only z11–14 coverage, refuses upstream redirects, strips the
-unused `image` layer, coalesces concurrent requests, runs at most six Mapillary
-fetches at once (a fetch every client has left is cancelled, or never started)
-and keeps tiles in a 24 h memory cache.
+unused `image` layer, shares one fetch per tile, runs at most six at once
+(cancelling those every client has left) and keeps tiles in memory for 24 h.
 
 MapillaryJS loads on the first photo. Opening one frames it with a single
 camera flight through the application's deferred navigation (`begin` /
@@ -3064,12 +3062,10 @@ Mapillary back on. At phone width the viewer height comes from the rail band
 so the whole photo fits.
 
 Browser gates: `npm run qa:street-level -- --url <server>` runs against real
-Mapillary with a token; `npm run qa:street-level:fixtures` answers every
-Mapillary request from fixtures (`providers/mapillary/coverageFixture.mjs`,
-`scripts/fixtures/street-level/`); its server (default `:4173`) still needs a
-`MAPILLARY_CLIENT_TOKEN`, and any value will do. CI runs the fixture gate with
-`--strict` against a production build served by `vite preview` with a dummy
-token.
+Mapillary; `npm run qa:street-level:fixtures` answers every Mapillary request
+from fixtures (`providers/mapillary/coverageFixture.mjs`,
+`scripts/fixtures/street-level/`), but its server (default `:4173`) still needs
+some `MAPILLARY_CLIENT_TOKEN`. CI runs it `--strict` against `vite preview`.
 
 Directions is a keyless front end to the routing the voice agent already
 uses. Its row chips are the whole interface: DRIVE / WALK / BIKE pick the
diff --git a/docs/KNOWN-ISSUES.md b/docs/KNOWN-ISSUES.md
index e41623cc6..6afd37839 100644
--- a/docs/KNOWN-ISSUES.md
+++ b/docs/KNOWN-ISSUES.md
@@ -57,9 +57,8 @@ Related keys (current versions):
 - Panel collapsed state: `godsEyeView.v6.panelCollapsed.<panel-id>` — `'0'` open,
   `'1'` closed, absent means the panel's own default. A view opened from a share
   link ignores the stored value entirely.
-- Panel positions: `godsEyeView.v8.panelPos.<panel-id>` — the versioned name for a
-  stored position. The current layout writes none, so deleting one changes
-  nothing.
+- Panel positions: `godsEyeView.v8.panelPos.<panel-id>` — the current layout
+  writes none.
 - CCTV calibration: `godsEyeView.cctv.calibration.v2`
 
 ---
diff --git a/server/providers/mapillary/tiles.js b/server/providers/mapillary/tiles.js
index f244b4985..76971bb66 100644
--- a/server/providers/mapillary/tiles.js
+++ b/server/providers/mapillary/tiles.js
@@ -14,10 +14,7 @@ const DROP_LAYERS = ['image'];
 /** A z14 tile with its image layer is ~11 MB; anything past this is wrong. */
 export const TILE_MAX_BYTES = 48 * 1024 * 1024;
 const FETCH_TIMEOUT_MS = 60_000;
-/**
- * Upstream fetches at once; more wait their turn. A fetch every client has
- * left is cancelled, or never started, so the queue holds live tiles only.
- */
+/** Upstream fetches at once; more wait their turn. */
 export const TILE_UPSTREAM_CONCURRENCY = 6;
 /** Tiles change only when new imagery is processed. */
 export const TILE_TTL_MS = 24 * 60 * 60 * 1000;
diff --git a/src/layers/streetLevel/cameraFraming.js b/src/layers/streetLevel/cameraFraming.js
index 432475411..c6bc9327a 100644
--- a/src/layers/streetLevel/cameraFraming.js
+++ b/src/layers/streetLevel/cameraFraming.js
@@ -4,10 +4,8 @@ import { plausibleSurfaceHeight, sampledSurfaceHeight } from './view.js';
 /** Fly the globe camera once to frame a photo after it opens. */
 export function createCameraFraming({ state }) {
   /**
-   * The application's camera authority (`attachNavigation`): `begin(noun)`
-   * takes a deferred ticket (a generation, or false when refused) that
-   * `reassert(generation)` honours, releasing tracking, only if nothing newer
-   * took the camera. Without it, framing flies directly.
+   * The application's camera authority: `reassert(begin())` succeeds only if
+   * nothing newer took the camera. Without it, framing flies directly.
    */
   let navigation = null;
   /** Our framing flight while it is current; Cesium calls `cancel` when another flight starts. */
diff --git a/src/layers/streetLevel/index.js b/src/layers/streetLevel/index.js
index 9f99883a9..061344ae4 100644
--- a/src/layers/streetLevel/index.js
+++ b/src/layers/streetLevel/index.js
@@ -218,11 +218,7 @@ export function createStreetLevelLayer({
       };
     },
 
-    /**
-     * The application's camera authority, the deferred `begin(noun)` /
-     * `reassert(generation)` pair: a photo claims the camera when opening
-     * starts and frames only if it still owns it once loaded.
-     */
+    /** A photo frames itself only if it still owns the camera once loaded. */
     attachNavigation(navigation) {
       parts.framing.attachNavigation(navigation);
     },
diff --git a/src/layers/streetLevel/view.js b/src/layers/streetLevel/view.js
index b58388c51..0fe86c344 100644
--- a/src/layers/streetLevel/view.js
+++ b/src/layers/streetLevel/view.js
@@ -31,10 +31,9 @@ export function sampledSurfaceHeight(scene, carto) {
 }
 
 /**
- * Ellipsoidal height (m) of the ground under the camera, or null. The globe
- * answers where shown; Google 3D hides it, so the rendered surface does
- * (roofs count: a building's height at most). A sample above the camera is
- * ignored: a raised ground would put the camera underground.
+ * Ellipsoidal height (m) of the ground under the camera, or null. Under
+ * Google 3D (globe hidden) the rendered surface counts, minus any roof above
+ * the camera.
  */
 export function groundUnderCamera(viewer) {
   const carto = viewer?.camera?.positionCartographic;
@@ -81,11 +80,9 @@ function groundHit(camera, point, ellipsoid, maxRange) {
 const BBOX_GRID = 5;
 
 /**
- * Visible [west, south, east, north] degrees, or null when fewer than four
- * rays hit. Only hits count, so a horizon cannot inflate the box to the world.
- * `groundHeight` raises the ellipsoid to the ground (rays to the bare
- * ellipsoid under Denver land kilometres too far out) and `maxRange` (m)
- * drops near-horizon hits.
+ * Visible [west, south, east, north] degrees from the rays that hit the
+ * ground, or null when fewer than four do. `groundHeight` raises the ellipsoid
+ * to the ground (Denver is 1,600 m up); `maxRange` (m) drops far hits.
  */
 export function visibleBbox(
   viewer,
@@ -158,10 +155,8 @@ export function cameraNadir(viewer) {
 }
 
 /**
- * Where coverage tiles are ranked from: halfway between the ground under the
- * camera and the ground at the centre of the screen, so a tilted view loads
- * what it looks at as well as what is near. The nadir when the centre ray
- * misses the ground within `maxRange`. Options as `visibleBbox`.
+ * Where coverage tiles are ranked from: halfway between the nadir and the
+ * screen centre's ground, or the nadir when that is out of `maxRange`.
  */
 export function viewFocus(
   viewer,
diff --git a/src/layers/streetLevel/viewerHost.js b/src/layers/streetLevel/viewerHost.js
index b1c618c9b..3a11ffb18 100644
--- a/src/layers/streetLevel/viewerHost.js
+++ b/src/layers/streetLevel/viewerHost.js
@@ -1,10 +1,6 @@
 import { freshStreet } from './state.js';
 
-/**
- * Owns the panel's viewer element and the photo viewer mounted in it (the
- * MapillaryJS adapter, or a stand-in). Its poses update `state.street` and
- * the marker; MapillaryJS loads on the first open.
- */
+/** The panel's photo viewer: its poses update `state.street` and the marker. */
 export function createViewerHost({ state, parts, adapter }) {
   /** Set once mounted, until `unmount`. */
   let unsubscribe = null;
diff --git a/src/tooling/mapillaryProvider.test.mjs b/src/tooling/mapillaryProvider.test.mjs
index c0b3b2368..ca0425742 100644
--- a/src/tooling/mapillaryProvider.test.mjs
+++ b/src/tooling/mapillaryProvider.test.mjs
@@ -45,7 +45,7 @@ const UNTRIMMED = tile([
   { name: 'image', payload: Buffer.alloc(4000, 1) },
 ]);
 
-/** Mount the plugin and return `call(route, url, method, headers)`. */
+/** Mount the plugin and return `call(route, url, method, headers, onResponse)`. */
 function install(mode = 'configureServer') {
   const routes = new Map();
   mapillaryProxy()[mode]({
diff --git a/src/ui/panelPositionControls.js b/src/ui/panelPositionControls.js
index 812122abe..1f67eb655 100644
--- a/src/ui/panelPositionControls.js
+++ b/src/ui/panelPositionControls.js
@@ -79,9 +79,8 @@ export class PanelPositionControls {
       this._restorePanelPosition(spec.id, spec.panel);
       this._makePanelDraggable(spec.id, spec.panel, spec.handle);
     }
-    // Keep a positioned panel on-screen when its HEIGHT changes after restore — it expands to its
-    // full row set a frame or two later, so the restore-time clamp used a stale (shorter) height and
-    // the panel could still hang off the bottom (audit U2). Re-clamp on every size change.
+    // A restored panel grows a frame or two later, so the restore-time clamp
+    // is stale: re-clamp on every size change.
     if (this._ppToggles && typeof ResizeObserver !== 'undefined') {
       this._draggableResizeObserver = new ResizeObserver(() =>
         this._reclampDraggablePanels(),
@@ -159,8 +158,7 @@ export class PanelPositionControls {
       const pos = JSON.parse(raw);
       if (!pos || typeof pos.left !== 'number' || typeof pos.top !== 'number')
         return;
-      // Clamp to the viewport: a position saved at one window size would otherwise land off-screen at
-      // another (audit U2 — observed a panel at x:-192). The drag handler clamps; restore must too.
+      // A position saved at another window size can land off-screen.
       const { left, top } = this._clampToViewport(
         Math.round(pos.left),
         Math.round(pos.top),
diff --git a/src/ui/streetLevelControls.js b/src/ui/streetLevelControls.js
index 5988963ab..140ddef72 100644
--- a/src/ui/streetLevelControls.js
+++ b/src/ui/streetLevelControls.js
@@ -105,10 +105,8 @@ export class StreetLevelControls {
       this._setParams({ sinceDays: sinceDays() }),
     );
     this.listen(el.viewerClose, 'click', () => this.layer.closeViewer?.());
-    // EXPAND is the browser's own fullscreen: it handles Esc, focus and the
-    // rest of the page. iPhone Safari has no element fullscreen, so there the
-    // viewer opens as a top-layer popover over the page instead (Esc and the
-    // button close it). With neither, the button is not offered.
+    // EXPAND is the browser's fullscreen. iPhone Safari has no element
+    // fullscreen, so there it is a top-layer popover; with neither, no button.
     this._expandMode =
       typeof el.viewerWrap?.requestFullscreen === 'function'
         ? 'fullscreen'
@@ -195,9 +193,8 @@ export class StreetLevelControls {
 
   async _toggleEnabled() {
     const enabled = this.actions.isEnabled?.() === true;
-    // The pill is the only switch. A share link or tool can switch Mapillary
-    // off under a layer that is on; the pill then reads OFF, and switching on
-    // brings Mapillary back (and the layer, if it is off too).
+    // The pill is the only switch: it also brings back Mapillary that a link
+    // or tool switched off under a layer that is on.
     if (this._state?.providerOn === false) {
       this._setParams({ mapillary: true });
       if (enabled) return;
@@ -252,11 +249,7 @@ export class StreetLevelControls {
     this._syncExpanded();
   }
 
-  /**
-   * While expanded, leave when Clean View, recording or the cockpit starts:
-   * they hide every panel, and the photo would stay over the globe (and in a
-   * recording).
-   */
+  /** Clean View, recording and the cockpit hide every panel, so they end EXPAND too. */
   _watchPanelHidingModes(on) {
     const body = document.body;
     if (!on || !body) {