feat: character system v2 — schema upgrade, memory system, per-character TTS routing

Character schema v2: background, dialogue_style, appearance, skills, gaze_presets
with automatic v1→v2 migration. LLM-assisted character creation via Character MCP
server. Two-tier memory system (personal per-character + general shared) with
budget-based injection into LLM system prompt. Per-character TTS voice routing via
state file — Wyoming TTS server reads active config to route between Kokoro (local)
and ElevenLabs (cloud PCM 24kHz). Dashboard: memories page, conversation history,
character profile on cards, auto-TTS engine selection from character config.
Also includes VTube Studio expression bridge and ComfyUI API guide.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

homeai-voice/scripts/launchd/com.homeai.wyoming-tts.plist

@@ -18,6 +18,12 @@
     <string>1.0</string>
   </array>
 
+  <key>EnvironmentVariables</key>
+  <dict>
+    <key>ELEVENLABS_API_KEY</key>
+    <string>sk_ec10e261c6190307a37aa161a9583504dcf25a0cabe5dbd5</string>
+  </dict>
+
   <key>RunAtLoad</key>
   <true/>