could anyone give my guidance on debugging a driver conflict?
```
amaranth.hdl._ir.DriverConflict: Bit 0 of signal (sig clk) has multiple drivers: /Users/roberttaylor/Code/ChipFlow/chipflow-lib/chipflow_lib/platforms/sim.py:87 and /Users/roberttaylor/Code/ChipFlow/chipflow-examples/.venv/lib/python3.11/site-packages/amaranth/hdl/_ir.py:283
```
Any ideas how I figure out where the driver instantiated in Fragment.prepare is coming from?