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-dashboard/launchd/com.homeai.dashboard.plist

@@ -24,6 +24,8 @@
     <string>/opt/homebrew/bin:/usr/local/bin:/usr/bin:/bin</string>
     <key>HOME</key>
     <string>/Users/aodhan</string>
+    <key>GAZE_API_KEY</key>
+    <string>e63401f17e4845e1059f830267f839fe7fc7b6083b1cb1730863318754d799f4</string>
   </dict>
 
   <key>RunAtLoad</key>