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-llm/launchd/com.homeai.preload-models.plist

@@ -12,17 +12,27 @@
     <string>/Users/aodhan/gitea/homeai/homeai-llm/scripts/preload-models.sh</string>
   </array>
 
+  <key>EnvironmentVariables</key>
+  <dict>
+    <!-- Override to change which medium model stays warm -->
+    <key>HOMEAI_MEDIUM_MODEL</key>
+    <string>qwen3.5:35b-a3b</string>
+  </dict>
+
   <key>RunAtLoad</key>
   <true/>
 
+  <key>KeepAlive</key>
+  <true/>
+
   <key>StandardOutPath</key>
   <string>/tmp/homeai-preload-models.log</string>
 
   <key>StandardErrorPath</key>
   <string>/tmp/homeai-preload-models-error.log</string>
 
-  <!-- Delay 15s to let Ollama start first -->
+  <!-- If the script exits/crashes, wait 30s before restarting -->
   <key>ThrottleInterval</key>
-  <integer>15</integer>
+  <integer>30</integer>
 </dict>
 </plist>