feat(voice): voice core — honest layer reach, spoken summary with on-screen card, narration, point-and-ask

- Voice layer manifest (src/voice/layerManifest.js) generates the layer enums,
  aliases and analyst field hints; a test fails when a catalog layer has no entry.
- analyst_query validates fields, operators, units, values and scopes, counts up
  to 250,000 loaded records per layer, reports complete/partial/unanswered, tells
  LAYER_OFF / NOT_READY / FEED_UNAVAILABLE apart from zero, refuses mismatched
  follow-ups and never lets a superseded query replace follow-up memory. Seven
  more layers expose analyst records.
- Tool results carry a code-built say line and a display card; the voice card in
  the mic control shows captions, plan steps and the result
  (src/voice/resultDisplay.js is the one adapter). Slow tools narrate their
  current step out of band; holding Space while the assistant talks cuts it off.
  Turn spans go to the debug log; caption transcription is metered; the log
  omits what was said unless GEV_VOICE_LOG_CONTENT=1.
- Point and ask: the Space-down pointer snapshot resolves "this", "that one" and
  "around here" through 'pointer' targets, and "the second one" through
  referent:n from the last numbered list.
- Prompt states each policy once (instructions + tools 48.5k -> 46.7k chars).
- Voice benchmark harness (scripts/qa-voice-bench.mjs, scripts/voice-bench/)
  shares its phrase table and grading with scripts/qa-voice-routing.mjs.

server/providers/openai/constants.js

@@ -16,6 +16,9 @@ const OPENAI_REALTIME_CONTEXT_RETENTION_DEFAULT = 0.5;
 
 const OPENAI_HUD_SUMMARY_MODEL_DEFAULT = 'gpt-5-nano';
 
+/** Input transcription for voice captions; OPENAI_REALTIME_TRANSCRIBE_MODEL=off disables it. */
+const OPENAI_REALTIME_TRANSCRIBE_MODEL_DEFAULT = 'gpt-4o-mini-transcribe';
+
 export {
   OPENAI_HUD_SUMMARY_MODEL_DEFAULT,
   OPENAI_REALTIME_MODEL_MINI_DEFAULT,
@@ -24,4 +27,5 @@ export {
   OPENAI_REALTIME_REASONING_DEFAULT,
   OPENAI_REALTIME_CONTEXT_TOKENS_DEFAULT,
   OPENAI_REALTIME_CONTEXT_RETENTION_DEFAULT,
+  OPENAI_REALTIME_TRANSCRIBE_MODEL_DEFAULT,
 };