refactor: consolidate hardware_optimizer.py stub into quant_selector.py (closes #92)

hardware_optimizer.py was a Phase 19 placeholder with no functional code.
quant_selector.py (PR #91) implements the real hardware-aware quantization
selection. No imports or references to hardware_optimizer existed in the
codebase, so this is a clean deletion.

Closes #92.

evolution/hardware_optimizer.py

@@ -1,5 +0,0 @@
-"""Phase 19: Hardware-Aware Inference Optimization.
-Part of the TurboQuant suite for local inference excellence.
-"""
-import logging
-# ... (rest of the code)