Add the VOX prosody preference and panel controls

CURRENT.md

@@ -40,6 +40,14 @@ mobile draft at 390px.
   - [x] C11 preview caching: Discord-hosted image/GIF previews (WebP 320px, hash-addressed, 5 MiB
     cap, one attempt) run after every walk in both modes. Live run `...-20260916090722`:
     `previewed: 2`; thumbs served over `/api/media/<scrape>/<item>/thumb` (200).
+  - [x] C62 VOX prosody controls. The last open Veskslop-side item from the MicroslopSam design:
+    `tts.vox` and `tts.voxClean` preferences (per-line overrides on `/api/audio/speak` and MCP
+    `speak`), `VESKSLOP_TTS_VOX` / `VESKSLOP_TTS_VOX_CLEAN` exports plus `{vox}` / `{vox_clean}`
+    placeholders for the command provider, and a Radio-kit row in the TTS panel with the checkboxes
+    and a help tooltip. VOX disables word mode in the panel; the wrapper keeps its documented
+    precedence. No other MicroslopSam work is outstanding: the engine branch is already an ancestor
+    of main, and the remaining contract note (HTTP `/voices` discovery) is not needed for the
+    command-provider path in use.
   - [x] C61 Media browsing performance. The grid's merge step rescanned every scrape database per
     request (about 300 ms for a page, 250 ms for stats, both refetched on every scroll append).
     `MediaService` now keeps a candidate cache keyed by a scrape revision plus the normalized