feat: refactor sgclaw around zeroclaw compat runtime

third_party/zeroclaw/examples/hardware/aardvark/devices/aardvark0.md.example

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+# aardvark0 — <Device Name> (<Part Number>)
+
+<!-- Copy this file to ~/.zeroclaw/hardware/devices/aardvark0.md  -->
+<!-- Fill in the device details from the datasheet.               -->
+
+## Connection
+
+- Adapter: Total Phase Aardvark (aardvark0)
+- Protocol: I2C  <!-- or SPI -->
+- I2C Address: 0x48  <!-- change to the actual device address -->
+- Bitrate: 100 kHz
+
+## Key Registers (from datasheet)
+
+<!-- Example for LM75 temperature sensor — replace with your device -->
+| Register | Address | Description                            | Notes                  |
+|----------|---------|----------------------------------------|------------------------|
+| Temp     | 0x00    | Temperature (2 bytes, big-endian)      | MSB × 0.5 °C per LSB  |
+| Config   | 0x01    | Configuration register                 | Read/write             |
+| Thyst    | 0x02    | Hysteresis temperature                 | Read/write             |
+| Tos      | 0x03    | Overtemperature shutdown threshold     | Read/write             |
+
+## Datasheet
+
+- File: `~/.zeroclaw/hardware/datasheets/<device>.pdf`
+- Source: <!-- URL where you downloaded the datasheet -->
+
+## Verified Working Commands
+
+```python
+# Read temperature from LM75 at I2C address 0x48, register 0x00
+i2c_read(addr=0x48, register=0x00, len=2)
+
+# Convert two bytes to °C:
+# raw = (byte[0] << 1) | (byte[1] >> 7)
+# temp = raw * 0.5  (if byte[0] bit 7 is 1, it's negative: raw - 256)
+```
+
+## Notes
+
+<!-- Add any device-specific quirks, power-on sequences, or gotchas here -->