Add Wyoming voice stack to pyinfra + landscape doc

- Move piper-compose.yaml / whisper-compose.yaml from repo root into
  pyinfra/framework/compose/{piper,whisper}.yml; bind paths shifted to
  /srv/docker/{piper,whisper}/data on the box.
- deploy.py registers both stacks and provisions the data dirs.
- Homepage gets a "Voice" group with informational tiles (Wyoming has
  no web UI, so tiles show container status without click-through).
- New VoiceModels.md captures the May 2026 STT/TTS landscape, why the
  current Wyoming defaults aren't SOTA, and concrete upgrade paths
  (whisper-large-v3-turbo + faster-whisper-server, Kokoro, Sesame CSM,
  F5-TTS for cloning).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

pyinfra/framework/deploy.py

@@ -339,6 +339,8 @@ for svc in (
     "phoenix",
     "openhands",
     "homepage",
+    "whisper",
+    "piper",
 ):
     files.directory(
         name=f"compose/{svc} dir",
@@ -470,6 +472,24 @@ for cfg in (
         _sudo=True,
     )
 
+# Voice stack — Wyoming-protocol Whisper (STT) and Piper (TTS). Models
+# are downloaded on first start; bind-mounting these dirs survives
+# container recreation.
+files.directory(
+    name="Whisper data dir",
+    path=f"{COMPOSE_DIR}/whisper/data",
+    group="docker",
+    mode="2775",
+    _sudo=True,
+)
+files.directory(
+    name="Piper data dir",
+    path=f"{COMPOSE_DIR}/piper/data",
+    group="docker",
+    mode="2775",
+    _sudo=True,
+)
+
 # --- Cleanup of artifacts from the prior native-build deploy ----------------
 # All idempotent — `present=False` is a no-op when the target is absent.