fix(hud): lead with the state tag, keep feedState in get_hud_caption

Review fixes for the HUD summary language change:

- The translated feed-state tag now leads the one-line summary and the
  fallback line, so the readout's ellipsis cannot hide it.
- get_hud_caption checks the reply's feedState, returns it and appends the
  state tag; a reply naming another state keeps only the place.
- The model gets the layer names the user sees (localizeLayerName).
- Japanese and Chinese summaries are capped at 20 characters; pt, zh-CN and
  zh-Hant get explicit language names.
- A partial view is narrated as incomplete coverage, not as not live.
- provenanceTag and hudSummaryMatchesProvenance move to layerSnapshot.js so
  the tools package can use them without browser globals.
- docs/CURRENT-STATE.md, changelog and comments updated; redundant tests
  trimmed.

server/providers/openai/hud-summary.js

@@ -1,5 +1,6 @@
 import {
   HUD_SUMMARY_FEED_STATES,
+  HUD_SUMMARY_MAX_UNSPACED_CHARS,
   HUD_SUMMARY_RESPONSE_FORMAT,
   hudSummaryInput,
   hudSummaryInstructions,
@@ -21,7 +22,7 @@ function extractOpenAiResponseText(data) {
     .trim();
 }
 
-/** The structured reply, or nulls when the model did not follow the format. */
+/** Parse the summary and normalize the canonical feed state. */
 function parseHudSummaryReply(text) {
   let reply = null;
   try {
@@ -39,13 +40,22 @@ function parseHudSummaryReply(text) {
 }
 
 function toFiveWordHudSummary(value) {
-  return String(value || '')
+  const words = String(value || '')
     .replace(/[^\p{L}\p{N}\s-]/gu, ' ')
     .trim()
     .split(/\s+/)
     .filter(Boolean)
     .slice(0, 5)
     .join(' ');
+  // Japanese and Chinese have no spaces to count words by: cap characters.
+  if (!/[\p{Script=Han}\p{Script=Hiragana}\p{Script=Katakana}]/u.test(words))
+    return words;
+  const graphemes = new Intl.Segmenter(undefined, { granularity: 'grapheme' });
+  return [...graphemes.segment(words)]
+    .slice(0, HUD_SUMMARY_MAX_UNSPACED_CHARS)
+    .map(({ segment }) => segment)
+    .join('')
+    .trim();
 }
 
 async function handleHudSummary(req, res) {