Summary

• Fixed P-CPU and E-CPU gauge display showing zero values on Apple Silicon machines
• Added support for all three Apple Silicon powermetrics output formats
• Enhanced parser to handle different cluster naming conventions across chip variants

Changes

• Updated powermetrics parser to detect and handle three distinct formats:
  • Standard format (M2/M3/M4 Pro/Max): Single E-Cluster and P-Cluster
  • Hybrid format (M1 Pro): Single E-Cluster with numbered P0/P1-Clusters
  • Ultra format (M1/M2 Ultra): All numbered clusters (E0/E1, P0/P1/P2/P3)
• Added comprehensive test coverage using real powermetrics output from M1 Pro, M3 Pro, and M1 Ultra
• Parser automatically averages values for numbered clusters while using direct values for standard clusters

Test Plan

• Added 16 unit tests covering all Apple Silicon formats
• Tested with real powermetrics output from M1 Pro, M3 Pro, and M1 Ultra machines
• All tests pass successfully
• Built and tested release binary

This fixes the issue where P-CPU and E-CPU utilization gauges were always showing 0% on Apple Silicon machines.