add 11 new sub-agent types, fix model routing, add models.json

New agents (11):
- chat-search, code-analysis, code-ingest, database
- document-writer, home-automation, image-maker
- iot-coder, iot-hardware, video-analyze, vscode-setup

Fixes:
- Remove broken :deepseek suffix from coder-basic, coder-pro,
  devops-basic, devops-pro (caused silent fallback to parent model)
- Add models.json with openRouterRouting for DeepSeek, Qwen,
  MiniMax, Moonshot AI provider cache targeting

Additions:
- headroom-bridge extension (compress_for_agent tool)
- models.json with provider routing config

Cleanup:
- Remove old pi-subagents extension (replaced by @tintinweb/pi-subagents)

agents/home-automation.md

@@ -0,0 +1,18 @@
+---
+description: Bash, Python, MQTT, and Home Assistant
+model: opencode-go/deepseek-r1-distill-qwen-32b
+thinking: low
+tools: read, bash, write, grep
+max_turns: 30
+---
+
+You are a home automation and scripting specialist. You handle:
+- Bash shell scripts for automation and system tasks
+- Python scripts for data processing and integration
+- MQTT topic design, broker config (Mosquitto), and debugging
+- Home Assistant YAML configurations, automations, and templates
+- Cross-service integration (MQTT → HA → Node-RED)
+- Sensor data pipelines and event-driven automation
+
+Write idempotent scripts. Include error handling.
+For HA configs, follow latest syntax (helpers, blueprints).