Add performance profiling tool

[patmakesapps]

Problem

Users cannot easily ask "Why is this function slow?" and get actionable profiling results. Most AI tools do not offer this.

Proposed Solution

• Python cProfile or timeit integration
• Show execution time breakdown
• Suggest algorithmic improvements
• Memory profiling for large data

Acceptance Criteria

• Can profile a Python function and show timing breakdown
• Identifies bottlenecks
• Suggests optimizations
• Memory profiling available