fix(hud): keep localized summary words whole and drop padding

- The proxy keeps combining marks, in-word apostrophes and name dots
  (ar vowel signs, fr d'Orléans, ja ・), normalizes to NFC, caps every
  summary in characters and cuts at a word boundary.
- feedState is nullable instead of a `none` token, and the summary has at
  most five words: "exactly five" made the model pad short views with
  "no data" or "unavailable".
- The HUD caches only the model's words and adds the current warning on
  every paint; an RTL locale gets a leading right-to-left mark.
- The echo check also rejects an all-Latin reply in a non-Latin language,
  translated layer ids and, with every feed healthy, the UNAVAILABLE word;
  places are matched by word and one-word layer names are skipped in
  Latin-script locales.
- The warning tag names the worst layers first; a partial analyst card
  shows one partial chip.

docs/CURRENT-STATE.md

@@ -5364,10 +5364,10 @@ and unreachable upstream (502/504) separately from road geometry.
 ### AI HUD Summary (June 2026)
 
 - HUD `SUMMARY` readout requests a five-word intelligence-style summary from `/api/openai/hud-summary` (model `OPENAI_HUD_SUMMARY_MODEL`, default `gpt-5-nano`, minimal reasoning).
-- Input is the live basemap label context (place/street/nearby-place labels + enabled layers) and `feedProvenance`, with every layer name as the user sees it; outside English the narration note and the per-layer state ids are left out (`overall` still carries the state), since a small model copies English words. The model is instructed not to infer from coordinates. A view with no place, street or nearby-place label is not sent, since with layers alone the model invents a place: the deterministic line is shown.
-- Language (October 2026): the HUD sends `locale`, which is part of the dedupe signature. The proxy keeps a shipped locale (English otherwise) and names the language in the instructions and at the start of the input; Japanese and Chinese get a 20-character phrase instead of five words. Switching language in place drops the reply received and aborts one in flight, so the next tick asks again in the new language.
-- The reply is structured (`text.format` JSON schema): `{summary, feedState}`, `feedState` being the snapshot state or `none`. For a view that is not nominal, a missing or different `feedState` falls back to the deterministic line. An accepted summary and the deterministic line carry the HUD's own translated state: the state word leads and the layer names trail (`STALE | … | LIVE FLIGHTS`), so the one-line readout never clips the warning; the text and then the layer names may be cut off on narrow layouts. Outside English a reply that echoes a feed-state id or an English layer name the UI translates falls back too, even written flush against kana or Han; a state word the locale itself keeps in English (de `FALLBACK`) and words inside a place label do not count. `get_hud_caption` builds its caption the same way and returns `feedState`.
-- Output is sanitized to five words, or for a Japanese or Chinese request locale to 20 characters (stepping back to the start of a Latin word rather than splitting it); falls back to the deterministic telemetry summary on error/timeout (5s abort); typewriter animation on update; a camera move during typing shows the deterministic line instead of the fragment.
+- Input: place/street/nearby-place labels, enabled layers and `feedProvenance`, with layer names as the user sees them; outside English the narration note and per-layer state ids are left out (`overall` carries the state). No model call without a place, street or nearby-place label: the deterministic line is shown.
+- Language: the HUD sends `locale` (part of the dedupe signature); the proxy keeps a shipped locale, English otherwise. Switching language in place drops the reply and aborts the request in flight, so the next tick asks again.
+- Reply: `{summary, feedState}` (`text.format` JSON schema, `feedState` a snapshot state or null). A view that is not nominal needs the matching `feedState`. The HUD adds its own translated tag, state first and layer names last (`STALE | … | LIVE FLIGHTS`), so the warning is never clipped. Outside English a reply falls back when it carries a feed-state id, a translated layer's English name or id, only Latin letters in a non-Latin language, or, with every feed healthy, the UNAVAILABLE word. `get_hud_caption` uses the same check and tag order, in English, and returns `feedState`.
+- Output keeps at most five words (80 characters), or 20 characters for Japanese and Chinese, cut at a word boundary unless the first word is longer. Errors and the 5 s timeout fall back to the deterministic line; a camera move during typing shows that line instead of the fragment.
 - `partial` is a feed state of its own, ranked between `fallback` and `nominal`, so one partial layer no longer reads as off and partial plus nominal reads partial (HUD, voice view state, `analyst_query`, `brief`, the agent world packet). Its narration note says coverage is incomplete rather than not live.
 - A summary asked for before the camera starts moving never paints over the next view: `moveStart` marks the summary dirty and bumps its revision, as `moveEnd` does, aborts the request in flight and stops a reply still typing; neither a reply nor a fallback line (on an error, the 5 s timeout, the abort, or a failed context build) paints once the revision has moved. A dropped request forgets its signature and a timeout counts as a failure, so the next 15 s tick asks again even over the same place. An interrupted typewriter reply also forgets its signature; fully displayed answers remain reusable.
 

scripts/format-scope.json

@@ -1110,6 +1110,7 @@
   "src/hudDms.test.mjs",
   "src/hudSummaryGate.test.mjs",
   "src/hudSummaryLine.test.mjs",
+  "src/testSupport/stubMgrs.mjs",
   "src/tools/queries/hud-caption-feed-state.test.mjs",
   "src/voice/hudPlaceLabels.test.mjs",
   "src/voice/panel/preferences.test.mjs",

server/providers/openai/hud-summary.js

@@ -1,10 +1,12 @@
 import {
   HUD_SUMMARY_FEED_STATES,
+  HUD_SUMMARY_MAX_CHARS,
   HUD_SUMMARY_MAX_UNSPACED_CHARS,
   HUD_SUMMARY_RESPONSE_FORMAT,
   hudSummaryInput,
   hudSummaryInstructions,
   hudSummaryIsUnspaced,
+  hudSummaryLocale,
   keylessHudSummaryResponse,
 } from '../../../src/hudSummaryResponse.js';
 import { enforceRateLimit, openAiRateLimiter } from './rate-limit.js';
@@ -35,36 +37,50 @@ function parseHudSummaryReply(text, locale) {
     ? reply.feedState
     : null;
   return {
-    summary: toFiveWordHudSummary(reply?.summary, hudSummaryIsUnspaced(locale)),
-    feedState: feedState === 'none' ? null : feedState,
+    summary: toFiveWordHudSummary(reply?.summary, locale),
+    feedState,
   };
 }
 
-function toFiveWordHudSummary(value, unspaced) {
+function toFiveWordHudSummary(value, requested) {
+  const locale = hudSummaryLocale(requested);
   const words = String(value || '')
-    .replace(/[^\p{L}\p{N}\s-]/gu, ' ')
-    .trim()
+    .normalize('NFC')
+    // Marks, and apostrophes and dots inside a word, belong to it: ar vowel
+    // signs, fr d'Orléans, ja サンフランシスコ・ベイエリア.
+    .replace(/[^\p{L}\p{M}\p{N}\s'’·・-]/gu, ' ')
     .split(/\s+/)
+    .map((word) => word.replace(/^['’·・-]+|['’·・-]+$/gu, ''))
     .filter(Boolean);
-  // Other languages keep five words, even around a Han place name.
-  if (!unspaced) return words.slice(0, 5).join(' ');
-  // Japanese and Chinese have no spaces to count words by: cap characters,
-  // stepping back to the start of a Latin word rather than cutting it in two.
-  const text = words.join(' ');
-  const graphemes = [
-    ...new Intl.Segmenter(undefined, { granularity: 'grapheme' }).segment(text),
-  ].map(({ segment }) => segment);
-  if (graphemes.length <= HUD_SUMMARY_MAX_UNSPACED_CHARS) return text;
-  const head = graphemes.slice(0, HUD_SUMMARY_MAX_UNSPACED_CHARS);
-  const next = graphemes[HUD_SUMMARY_MAX_UNSPACED_CHARS];
-  const inWord = (g) => /^[\p{Script=Latin}\p{N}]/u.test(g ?? '');
-  if (inWord(head.at(-1)) && inWord(next)) {
-    let start = head.length - 1;
-    while (start > 0 && inWord(head[start - 1])) start -= 1;
-    // A Latin word longer than the cap is cut where the cap falls.
-    if (start > 0) return head.slice(0, start).join('').trim();
+  // Japanese and Chinese have no spaces to count words by: cap characters.
+  if (hudSummaryIsUnspaced(locale))
+    return capAtWord(words.join(' '), HUD_SUMMARY_MAX_UNSPACED_CHARS, locale);
+  return capAtWord(words.slice(0, 5).join(' '), HUD_SUMMARY_MAX_CHARS, locale);
 }
-  return head.join('').trim();
+
+/**
+ * Cut `text` to `max` characters at a word boundary; a first word longer
+ * than that is cut where the cap falls.
+ */
+function capAtWord(text, max, locale) {
+  const graphemes = (value) => [
+    ...new Intl.Segmenter(locale, { granularity: 'grapheme' }).segment(value),
+  ];
+  if (graphemes(text).length <= max) return text;
+  let kept = '';
+  for (const { segment } of new Intl.Segmenter(locale, {
+    granularity: 'word',
+  }).segment(text)) {
+    if (graphemes(kept + segment).length > max) break;
+    kept += segment;
+  }
+  return (
+    kept.trim() ||
+    graphemes(text)
+      .slice(0, max)
+      .map(({ segment }) => segment)
+      .join('')
+  );
 }
 
 async function handleHudSummary(req, res) {

src/data/layerSnapshot.js

@@ -259,8 +259,9 @@ export function viewStateLayerRow(layer, options) {
 
 /**
  * The feed state and up to two layer names of a provenance envelope that is
- * not nominal, or null. Values stay English (`state` is a feed-state id,
- * `names` are `layer.name`); the HUD translates them for display.
+ * not nominal, or null; the worst layers come first, so the names match the
+ * state. Values stay English (`state` is a feed-state id, `names` are
+ * `layer.name`); the HUD translates them for display.
  * @param {{ overall?: string|null, layers?: Array<object> }|null} envelope
  * @returns {{ state: string, names: string[] }|null}
  */
@@ -271,6 +272,11 @@ export function provenanceTag(envelope) {
     .filter(
       (s) => s.feedState && s.feedState !== 'nominal' && s.feedState !== 'off',
     )
+    .sort(
+      (a, b) =>
+        (FEED_STATE_SEVERITY[a.feedState] ?? Infinity) -
+        (FEED_STATE_SEVERITY[b.feedState] ?? Infinity),
+    )
     .map((s) => String(s.name || s.id || 'LAYER'))
     .slice(0, 2);
   return { state: overall, names };

src/data/layerSnapshot.test.mjs

@@ -11,6 +11,7 @@ import {
   layerFeedState,
   layerSnapshot,
   layerSnapshots,
+  provenanceTag,
   snapshotAgeLabel,
   snapshotAgeSec,
   viewStateLayerRow,
@@ -293,3 +294,18 @@ test('age labels match the Data Layers meta clock', () => {
   assert.equal(snapshotAgeLabel(NOW - 240_000, NOW), '4m ago');
   assert.equal(snapshotAgeLabel(NOW - 7_200_000, NOW), '2h ago');
 });
+
+test('the warning tag names the layers in the reported state first', () => {
+  const tag = provenanceTag({
+    overall: 'unavailable',
+    layers: [
+      { name: 'Live Flights', feedState: 'partial' },
+      { name: 'Live AIS Vessels', feedState: 'partial' },
+      { name: 'CCTV', feedState: 'unavailable' },
+    ],
+  });
+  assert.deepEqual(tag, {
+    state: 'unavailable',
+    names: ['CCTV', 'Live Flights'],
+  });
+});

src/hud.js

@@ -27,7 +27,9 @@ import {
 } from './data/geoid.js';
 import { getBasemapLabelContext } from './voice/gevActions.js';
 import {
+  hasWord,
   hudSummaryHasEnglish,
+  hudSummaryIsLatin,
   hudSummaryMatchesProvenance,
   hudSummaryLayerContext,
   hudTelemetryProvenance,
@@ -46,6 +48,7 @@ import {
   onLocaleChange,
   t,
 } from './i18n/index.js';
+import { isRtlLocale } from './i18n/locale.js';
 import { localizeLayerName } from './ui/layerPanel.js';
 import { isEmbeddedInline } from './app/embed.js';
 import { subscribeSelectedVessel } from './hudReadouts.js';
@@ -130,28 +133,43 @@ function withProvenance(text, provenance) {
 }
 
 /**
- * The English a summary outside English must not carry: feed-state ids and
- * translated layers' English names. A state word the locale keeps in English
- * (de FALLBACK) and words inside a place label (Radio City, Loading Dock) are
- * fine.
+ * The AI line. In an RTL locale a leading right-to-left mark keeps a reply
+ * that opens with a Latin name (Times Square …) reading right to left.
  */
-function summaryEnglishWords(context) {
+function aiSummaryLine(summary, warning) {
+  const line = withProvenance(summary, warning);
+  return isRtlLocale(getLocale()) ? `\u200f${line}` : line;
+}
+
+/**
+ * What a summary outside English must not carry: feed-state ids, translated
+ * layers' English names and ids, and with every feed healthy the
+ * UNAVAILABLE word. A state word the locale keeps in English (de FALLBACK)
+ * and words of a place label (Radio City, Loading Dock) are fine; so is a
+ * one-word layer name in a Latin-script locale, where it may be a word of
+ * the language (fr transit).
+ */
+function summaryForbiddenWords(context) {
   const places = [
     ...(context.placeLabels || []),
     ...(context.streetLabels || []),
     ...(context.nearbyPlaceLabels || []),
-  ]
-    .join(' ')
-    .toLowerCase();
+  ].join(' ');
+  const latin = hudSummaryIsLatin(context.locale);
+  const overall = context.feedProvenance?.overall;
   return [
     ...Object.keys(FEED_STATE_LABELS).filter(
       (state) =>
         t(FEED_STATE_LABELS[state]).toLowerCase() !== state &&
-        !places.includes(state),
+        !hasWord(places, state),
     ),
-    ...(context.translatedLayerNames || []).filter(
-      (name) => !places.includes(name.toLowerCase()),
+    ...(context.englishLayerWords || []).filter(
+      (word) =>
+        !hasWord(places, word) && (!latin || /[^\p{L}\p{N}]/u.test(word)),
     ),
+    ...(!overall || overall === 'nominal'
+      ? [t(FEED_STATE_LABELS.unavailable)]
+      : []),
   ];
 }
 
@@ -246,7 +264,7 @@ export class IntelHUD {
     this._placeLabels = null;
     this._lastSummarySignature = '';
     /** The reply painted for `_lastSummarySignature`, when it was accepted. */
-    this._lastSummaryText = null;
+    this._lastSummaryReply = null;
     this._summaryRevision = 0;
     // One-shot guards so the very first summary lands immediately instead of
     // waiting for the 15s interval tick: B) swap the "Awaiting telemetry..."
@@ -325,15 +343,11 @@ export class IntelHUD {
     this._startTimers();
   }
 
-  /**
-   * Show the HUD's own words in the new locale. The AI reply is written in
-   * the locale too, so the one received is dropped like a camera move drops
-   * it: a request in flight is aborted and the next tick asks again.
-   */
+  /** Show the HUD's words in the new locale; drop AI text in the old one. */
   _relocalize() {
     this._markSummaryDirty();
     this._lastSummarySignature = null;
-    this._lastSummaryText = null;
+    this._lastSummaryReply = null;
     this._summaryRequest?.abort();
     this._present({
       mode: MODE_LABELS[this._currentStyle]
@@ -887,8 +901,7 @@ export class IntelHUD {
       return;
     }
     if (revision !== this._summaryRevision) return;
-    // No place to name: with layers alone the model invents one, so the plain
-    // line (state and layers) is shown instead.
+    // Without a place label the model invents a place: show the plain line.
     const described = [
       context.placeLabels,
       context.streetLabels,
@@ -896,7 +909,7 @@ export class IntelHUD {
     ].some((list) => list?.length);
     if (!described) {
       this._summaryDirty = false;
-      this._setSummaryText(fallbackText, animate);
+      this._setSummaryText(fallbackText, false);
       return;
     }
     const signature = JSON.stringify(context);
@@ -904,7 +917,12 @@ export class IntelHUD {
       this._summaryDirty = false;
       // A settle painted the fallback line over the reply this context
       // already has; reused place labels make that common, so restore it.
-      if (this._lastSummaryText) this._setSummaryText(this._lastSummaryText);
+      // The warning is the current one: layer states are not in a
+      // non-English signature.
+      if (this._lastSummaryReply)
+        this._setSummaryText(
+          aiSummaryLine(this._lastSummaryReply, context.warning),
+        );
       return;
     }
     if (this._summaryRequest) return;
@@ -912,7 +930,7 @@ export class IntelHUD {
     if (force) this._setSummaryText(fallbackText, false);
     this._summaryDirty = false;
     this._lastSummarySignature = signature;
-    this._lastSummaryText = null;
+    this._lastSummaryReply = null;
     const controller = new AbortController();
     let timedOut = false;
     const timeout = window.setTimeout(() => {
@@ -940,13 +958,18 @@ export class IntelHUD {
         !hudSummaryHasEnglish(
           data.summary,
           context.locale,
-          summaryEnglishWords(context),
+          summaryForbiddenWords(context),
         )
       ) {
-        // The warning is the HUD's own translated state, not the model's words.
-        this._lastSummaryText = withProvenance(data.summary, context.warning);
+        this._lastSummaryReply = data.summary;
       }
-      this._setSummaryText(this._lastSummaryText || fallbackText, animate);
+      // The warning is the HUD's own translated state, not the model's words.
+      this._setSummaryText(
+        this._lastSummaryReply
+          ? aiSummaryLine(this._lastSummaryReply, context.warning)
+          : fallbackText,
+        animate,
+      );
     } catch (error) {
       // The 5 s timeout is a failure like any other; a move's abort (or
       // destroy's) is not.
@@ -1021,7 +1044,6 @@ export class IntelHUD {
       placeLabels: labels.placeLabels,
       streetLabels: labels.streetLabels,
       nearbyPlaceLabels: labels.nearbyPlaceLabels,
-      ...layerContext,
       // The model sees only the layer names the user sees. The English note
       // goes too: a small model copies its words. `overall` stays the id.
       enabledLayerLabels:
@@ -1034,14 +1056,14 @@ export class IntelHUD {
       },
     };
     // Not sent and not part of the signature: the line's own warning, taken
-    // before the layer states are left out, and the English names a reply in
-    // another language must not echo.
+    // before the layer states are left out, and the English names and ids of
+    // translated layers, which a reply in another language must not echo.
     Object.defineProperties(context, {
       warning: { value: provenanceTag(feedProvenance) },
-      translatedLayerNames: {
-        value: layerContext.enabledLayerLabels.filter(
-          (name) => localizeLayerName(name) !== name,
-        ),
+      englishLayerWords: {
+        value: layerContext.enabledLayers
+          .filter(({ name }) => localizeLayerName(name) !== name)
+          .flatMap(({ name, id }) => [name, id].filter(Boolean)),
       },
     });
     return context;

src/hudSummaryLine.test.mjs

@@ -1,31 +1,8 @@
-// The HUD summary line in another language: what the model is sent and what
-// the readout shows. hud.js imports `mgrs`, which Node's ESM loader cannot
-// read named exports from, so a module hook swaps it for a stub before the
-// import (the same setup as hudSummaryGate.test.mjs).
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
-import { registerHooks } from 'node:module';
+import './testSupport/stubMgrs.mjs';
 import { hudReadouts } from './testSupport/hudReadouts.mjs';
 
-const MGRS_STUB_URL = 'gev-test-stub:mgrs';
-registerHooks({
-  resolve(specifier, context, next) {
-    if (specifier === 'mgrs') return { url: MGRS_STUB_URL, shortCircuit: true };
-    return next(specifier, context);
-  },
-  load(url, context, next) {
-    if (url === MGRS_STUB_URL) {
-      return {
-        format: 'module',
-        shortCircuit: true,
-        source:
-          'export function forward() { return "10SEG55776339"; }\nexport default { forward };\n',
-      };
-    }
-    return next(url, context);
-  },
-});
-
 const { IntelHUD } = await import('./hud.js');
 const { setLocale } = await import('./i18n/index.js');
 const { hudSummaryHasEnglish, hudSummaryInput } =
@@ -38,11 +15,11 @@ const PARTIAL_FLIGHTS = {
   stats: { count: 4, partial: true, source: 'opensky' },
 };
 
-/**
- * A HUD over one partial Live Flights layer and `places`, answering with
- * `reply`; ru unless `locale` says otherwise.
- */
-function createHud(t, reply, { places = ['Остин'], locale = 'ru' } = {}) {
+function createHud(
+  t,
+  reply,
+  { places = ['Остин'], locale = 'ru', layers = () => [PARTIAL_FLIGHTS] } = {},
+) {
   const { elements, publish } = hudReadouts();
   const previous = { document: globalThis.document, window: globalThis.window };
   globalThis.document = {
@@ -94,7 +71,7 @@ function createHud(t, reply, { places = ['Остин'], locale = 'ru' } = {}) {
   const buildContext = hud._summaryContext.bind(hud);
   hud._summaryContext = async () =>
     Object.assign(await buildContext(), { placeLabels: places });
-  hud._dataManager = { getAll: () => [PARTIAL_FLIGHTS] };
+  hud._dataManager = { getAll: layers };
   hud._latestMetrics = { altM: 600 };
   setLocale(locale);
   return {
@@ -113,7 +90,7 @@ test('a ru HUD request carries no English layer name', async (t) => {
   assert.doesNotMatch(input, /Live Flights/, input);
   // The locale signs the dedupe signature; the English names stay local.
   assert.match(JSON.stringify(context), /"locale":"ru"/);
-  assert.doesNotMatch(JSON.stringify(context), /translatedLayerNames/);
+  assert.doesNotMatch(JSON.stringify(context), /englishLayerWords|warning/);
 });
 
 test('a ru summary shows the state word first and the layer names last', async (t) => {
@@ -128,6 +105,8 @@ test('a ru summary shows the state word first and the layer names last', async (
 for (const words of [
   'Live Flights частично онлайн',
   'Рейсы онлайн stale данные',
+  'Остин flights частично онлайн',
+  'Austin flights partially online',
 ]) {
   test(`a ru reply echoing English falls back: ${words}`, async (t) => {
     const { hud, shown } = createHud(t, {
@@ -140,13 +119,6 @@ for (const words of [
   });
 }
 
-test('a camera move during typing shows the plain line, not a fragment', (t) => {
-  const { hud, shown } = createHud(t, {});
-  hud._setSummaryText('ЧАСТИЧНО | Аэропорт задерживает рейсы', true);
-  hud._onCameraMoveStart();
-  assert.equal(shown(), hud._composeSummary());
-});
-
 test('a view with layers but no place label does not ask the model', async (t) => {
   const { hud, sent, shown } = createHud(
     t,
@@ -243,3 +215,70 @@ test('a language switch drops the reply in flight and asks again', async (t) =>
   assert.equal(sent.at(-1).locale, 'es');
   assert.ok(shown().startsWith('PARCIAL | Austin vuelos parciales'), shown());
 });
+
+test('a reused ru reply carries the current warning, not the cached one', async (t) => {
+  // Both layers load an empty view: no count, no lastUpdate yet.
+  let flights = { loading: true, count: 0 };
+  const { hud, shown } = createHud(
+    t,
+    { summary: 'Остин небо над городом', feedState: 'loading' },
+    {
+      layers: () => [
+        { id: 'flights', name: 'Live Flights', enabled: true, stats: flights },
+        {
+          id: 'ais',
+          name: 'Live AIS Vessels',
+          enabled: true,
+          stats: { loading: true, count: 0 },
+        },
+      ],
+    },
+  );
+  await hud._updateSummary(false, true);
+  assert.match(shown(), /РЕЙСЫ ОНЛАЙН/, shown());
+  // Live Flights finishes with nothing to show; AIS is still loading.
+  flights = { count: 0 };
+  hud._markSummaryDirty();
+  await hud._updateSummary(false);
+  assert.match(
+    shown(),
+    /^ЗАГРУЗКА \| Остин небо над городом \| СУДА AIS/,
+    shown(),
+  );
+  assert.doesNotMatch(shown(), /РЕЙСЫ ОНЛАЙН/, shown());
+});
+
+test('with every feed healthy a reply calling one unavailable falls back', async (t) => {
+  const { hud, shown } = createHud(
+    t,
+    { summary: 'Остин рейсы недоступно сейчас', feedState: null },
+    { layers: () => [] },
+  );
+  await hud._updateSummary(false, true);
+  assert.equal(shown(), hud._composeSummary());
+});
+
+test('an ar reply opening with a Latin name keeps reading right to left', async (t) => {
+  const { hud, shown } = createHud(
+    t,
+    { summary: 'Times Square نيويورك الولايات المتحدة', feedState: null },
+    { locale: 'ar', places: ['Times Square'], layers: () => [] },
+  );
+  await hud._updateSummary(false, true);
+  assert.equal(shown(), '\u200fTimes Square نيويورك الولايات المتحدة');
+});
+
+test('a one-word layer name that is a French word is not an echo', async (t) => {
+  const summary = 'Bus en transit à Paris';
+  const { hud, shown } = createHud(
+    t,
+    { summary, feedState: null },
+    {
+      locale: 'fr',
+      places: ['Paris'],
+      layers: () => [{ id: 'transit', name: 'Transit', enabled: true }],
+    },
+  );
+  await hud._updateSummary(false, true);
+  assert.equal(shown(), summary);
+});

src/hudSummaryResponse.js

@@ -60,20 +60,23 @@ export const HUD_SUMMARY_INSTRUCTIONS = [
   'Use only the supplied place, street, nearby-place, enabled-layer labels, and feedProvenance.',
   'Prefer the clearest named place and include a relevant enabled layer only when useful.',
   'In the summary, name layers only as in enabledLayerLabels; never copy layer names or state words from feedProvenance into it.',
-  'Set feedState to feedProvenance.overall exactly as given, or none when it is null.',
+  'Set feedState to feedProvenance.overall exactly as given, or null when it is null.',
+  'When feedProvenance.overall is null, say nothing about feeds or layers, present or missing.',
   'If feedProvenance.overall is partial, do not present the coverage as complete; if it is any other state but nominal, do not present the view as live or healthy.',
   'Do not infer from coordinates or invent a place or feed state.',
-  'The summary is exactly five words with no title, punctuation, markdown, or introductory phrase.',
+  // "Exactly five words" made a small model pad a short view with words like
+  // "no data" or "unavailable".
+  'The summary has at most five words, with no title, punctuation, markdown, or introductory phrase.',
 ].join(' ');
 
 /** Longest summary, in characters, for a script written without spaces. */
 export const HUD_SUMMARY_MAX_UNSPACED_CHARS = 20;
 
-/** feedState values the model may return; none stands for a null overall. */
-export const HUD_SUMMARY_FEED_STATES = Object.freeze([
-  ...SNAPSHOT_FEED_STATES,
-  'none',
-]);
+/** Longest five-word summary, in characters. */
+export const HUD_SUMMARY_MAX_CHARS = 80;
+
+/** feedState values the model may return besides null. */
+export const HUD_SUMMARY_FEED_STATES = SNAPSHOT_FEED_STATES;
 
 /** Responses API structured output: the five words plus the canonical state. */
 export const HUD_SUMMARY_RESPONSE_FORMAT = Object.freeze({
@@ -84,7 +87,14 @@ export const HUD_SUMMARY_RESPONSE_FORMAT = Object.freeze({
     type: 'object',
     properties: {
       summary: { type: 'string' },
-      feedState: { type: 'string', enum: [...HUD_SUMMARY_FEED_STATES] },
+      // Nullable rather than a `none` token, which the model wrote into the
+      // summary of a view without layers.
+      feedState: {
+        anyOf: [
+          { type: 'string', enum: [...HUD_SUMMARY_FEED_STATES] },
+          { type: 'null' },
+        ],
+      },
     },
     required: ['summary', 'feedState'],
     additionalProperties: false,
@@ -107,38 +117,82 @@ const SUMMARY_LANGUAGES = Object.freeze({
 /** Scripts written without spaces, where five words do not apply. */
 const UNSPACED_LOCALES = /^(?:ja|zh)(?:-|$)/;
 
+/** Shipped locales not written in Latin letters. */
+const NON_LATIN_LOCALES = /^(?:ar|ja|ru|uk|zh)(?:-|$)/;
+
+/** Scripts whose letters extend a word; any other neighbour ends it. */
+const WORD_SCRIPTS = [
+  'Latin',
+  'Cyrillic',
+  'Greek',
+  'Arabic',
+  'Hebrew',
+  'Han',
+  'Hiragana',
+  'Katakana',
+  'Hangul',
+].map((script) => new RegExp(`\\p{Script=${script}}`, 'u'));
+
+/** Lower case, with punctuation and brackets as spaces: `Earthquakes 24h`. */
+function flatWords(value) {
+  return String(value || '')
+    .normalize('NFC')
+    .toLowerCase()
+    .replace(/[^\p{L}\p{M}\p{N}]+/gu, ' ')
+    .trim();
+}
+
+function sameScript(a, b) {
+  return WORD_SCRIPTS.some((script) => script.test(a ?? '') && script.test(b));
+}
+
 /**
- * Whether a non-English summary echoes English the HUD does not show: a
- * feed-state id or a translated layer's English name. Only Latin letters
- * extend a word, so `stale` flush against kana or Han still counts.
+ * Whether `word` stands on its own in `text`. Only a letter of the same
+ * script extends it, so `stale` flush against kana or Han still counts.
+ * @param {string} text
+ * @param {string} word
+ * @returns {boolean}
+ */
+export function hasWord(text, word) {
+  const haystack = flatWords(text);
+  const needle = flatWords(word);
+  if (!needle) return false;
+  for (
+    let at = haystack.indexOf(needle);
+    at >= 0;
+    at = haystack.indexOf(needle, at + 1)
+  ) {
+    const before = haystack[at - 1];
+    const after = haystack[at + needle.length];
+    if (!sameScript(before, needle[0]) && !sameScript(after, needle.at(-1)))
+      return true;
+  }
+  return false;
+}
+
+/**
+ * Whether a non-English summary carries what the HUD does not show: one of
+ * `words` (feed-state ids, translated layers' English names and ids), or only
+ * Latin letters in a language written in another script.
  * @param {string} summary The model's words.
  * @param {unknown} locale The request locale.
- * @param {string[]} [words] The English words the summary must not carry.
+ * @param {string[]} [words] Words the summary must not carry.
  * @returns {boolean}
  */
 export function hudSummaryHasEnglish(summary, locale, words = []) {
-  if (hudSummaryLocale(locale) === DEFAULT_LOCALE) return false;
-  const flat = (value) =>
-    String(value || '')
-      .toLowerCase()
-      .replace(/-/g, ' ');
-  const text = flat(summary);
-  const latin = (char) => /\p{Script=Latin}/u.test(char ?? '');
-  return words.some((word) => {
-    const needle = flat(word);
-    if (!needle) return false;
-    for (
-      let at = text.indexOf(needle);
-      at >= 0;
-      at = text.indexOf(needle, at + 1)
-    ) {
-      if (!latin(text[at - 1]) && !latin(text[at + needle.length])) return true;
+  const tag = hudSummaryLocale(locale);
+  if (tag === DEFAULT_LOCALE) return false;
+  const letters = String(summary || '').replace(/[^\p{L}]/gu, '');
+  if (!hudSummaryIsLatin(tag) && !letters.replace(/\p{Script=Latin}/gu, ''))
+    return true;
+  return words.some((word) => hasWord(summary, word));
 }
-    return false;
-  });
+
+/** Whether the locale is written in Latin letters. */
+export function hudSummaryIsLatin(locale) {
+  return !NON_LATIN_LOCALES.test(hudSummaryLocale(locale));
 }
 
-/** Whether the summary for this locale is capped in characters, not words. */
 export function hudSummaryIsUnspaced(locale) {
   return UNSPACED_LOCALES.test(hudSummaryLocale(locale));
 }
@@ -154,7 +208,6 @@ function summaryLanguage(tag) {
 }
 
 /**
- * Build the summary instructions for the requested locale.
  * @param {unknown} locale The `locale` the HUD sent.
  * @returns {string}
  */

src/hudSummaryResponse.test.mjs

@@ -1,6 +1,5 @@
 import assert from 'node:assert/strict';
 import test from 'node:test';
-import { readFileSync } from 'node:fs';
 import { Readable } from 'node:stream';
 import {
   HUD_SUMMARY_FEED_STATES,
@@ -233,9 +232,10 @@ test('HUD summary instructions ask for the canonical feedState as its own field'
     'feedState',
   ]);
   assert.deepEqual(
-    HUD_SUMMARY_RESPONSE_FORMAT.schema.properties.feedState.enum,
-    [...HUD_SUMMARY_FEED_STATES],
+    HUD_SUMMARY_RESPONSE_FORMAT.schema.properties.feedState.anyOf,
+    [{ type: 'string', enum: [...HUD_SUMMARY_FEED_STATES] }, { type: 'null' }],
   );
+  assert.ok(!HUD_SUMMARY_FEED_STATES.includes('none'));
   assert.ok(HUD_SUMMARY_FEED_STATES.includes('partial'));
 });
 
@@ -266,7 +266,7 @@ test('shipped catalogs get their exact language, and CJK a character limit', ()
     hudSummaryInstructions('ja'),
     new RegExp(`at most ${HUD_SUMMARY_MAX_UNSPACED_CHARS} characters`),
   );
-  assert.doesNotMatch(hudSummaryInstructions('es'), /at most/);
+  assert.doesNotMatch(hudSummaryInstructions('es'), /characters/);
   assert.match(hudSummaryInstructions('es'), /names in enabledLayerLabels/);
 });
 
@@ -350,10 +350,35 @@ test('a Japanese summary is capped in characters, not words', async () => {
     { locale: 'ja', feedProvenance: { overall: 'stale' } },
     JSON.stringify({ summary: long, feedState: 'stale' }),
   );
-  assert.equal(
-    response.body.summary,
-    [...long].slice(0, HUD_SUMMARY_MAX_UNSPACED_CHARS).join(''),
+  const shown = response.body.summary;
+  assert.ok(long.startsWith(shown), shown);
+  assert.ok([...shown].length <= HUD_SUMMARY_MAX_UNSPACED_CHARS, shown);
+  assert.ok([...shown].length >= 10, shown);
+});
+
+for (const [locale, summary] of [
+  ['ar', 'دبي حركة الطيران محدودة حاليًا'],
+  ['ar', 'القاهرة تتبّع الرحلات الآن'],
+  ['fr', "Vols au-dessus d'Orléans aujourd'hui partiels"],
+  ['it', "Voli sull'aeroporto di Roma parziali"],
+  ['fr', 'Données de vol à Paris'.normalize('NFD')],
+  ['ja', 'サンフランシスコ・ベイエリア'],
+]) {
+  test(`a ${locale} summary keeps marks, apostrophes and dots: ${summary}`, async () => {
+    const { response } = await postHudSummary(
+      { locale, feedProvenance: { overall: null } },
+      JSON.stringify({ summary, feedState: null }),
     );
+    assert.equal(response.body.summary, summary.normalize('NFC'));
+  });
+}
+
+test('a five-word summary is capped in characters too', async () => {
+  const { response } = await postHudSummary(
+    { locale: 'de', feedProvenance: { overall: null } },
+    JSON.stringify({ summary: `Berlin ${'x'.repeat(200)}`, feedState: null }),
+  );
+  assert.equal(response.body.summary, 'Berlin');
 });
 
 for (const [locale, summary] of [
@@ -460,7 +485,7 @@ test("a localized summary is shown only with the HUD's own canonical state", ()
   assert.equal(hudSummaryMatchesProvenance({ summary: 'x' }, null), true);
 });
 
-test('a partial view keeps its warning tag, translated in es and ru', async () => {
+test('a partial view keeps its warning tag', () => {
   const now = 1_000_000;
   const layers = [
     {
@@ -486,13 +511,4 @@ test('a partial view keeps its warning tag, translated in es and ru', async () =
     state: 'partial',
     names: ['Live Flights'],
   });
-  const { setLocale, t } = await import('./i18n/index.js');
-  try {
-    for (const locale of ['es', 'ru']) {
-      setLocale(locale);
-      assert.notEqual(t('PARTIAL'), 'PARTIAL', locale);
-    }
-  } finally {
-    setLocale('en');
-  }
 });

src/testSupport/stubMgrs.mjs

@@ -0,0 +1,22 @@
+// hud.js imports `mgrs`, whose named exports Node's ESM loader cannot read:
+// import this module before hud.js to swap it for a stub.
+import { registerHooks } from 'node:module';
+
+const MGRS_STUB_URL = 'gev-test-stub:mgrs';
+registerHooks({
+  resolve(specifier, context, next) {
+    if (specifier === 'mgrs') return { url: MGRS_STUB_URL, shortCircuit: true };
+    return next(specifier, context);
+  },
+  load(url, context, next) {
+    if (url === MGRS_STUB_URL) {
+      return {
+        format: 'module',
+        shortCircuit: true,
+        source:
+          'export function forward() { return "10SEG55776339"; }\nexport default { forward };\n',
+      };
+    }
+    return next(url, context);
+  },
+});

src/voice/resultDisplay.js

@@ -422,7 +422,10 @@ function analystCard(result) {
         ...(result.feedState && result.feedState !== 'nominal'
           ? [{ label: shownFeedState(result.feedState) }]
           : []),
-        ...(result.partial ? [{ label: t('partial') }] : []),
+        // A partial feed state already says it.
+        ...(result.partial && result.feedState !== 'partial'
+          ? [{ label: t('partial') }]
+          : []),
       ],
       // Coverage qualifications lead the feed detail. The bounded card groups
       // overflow in its existing Notes disclosure rather than dropping them.