[Go Migration] Investigate gcode_arcs.test and pressure_advance.test failures

[AndySze]

Problem

These tests are failing but the root cause needs investigation. They may be related to:

• Floating-point rounding issues (like screws_tilt_adjust)
• Timing offsets (like bltouch)
• Other step generation differences

Current Status

• gcode_arcs.test: ❌ FAIL
• pressure_advance.test: ❌ FAIL

Investigation Plan

1. First fix [Go Migration] Fix screws_tilt_adjust.test floating-point rounding #2 (screws_tilt_adjust floating-point rounding)
2. Re-run tests to see if they pass
3. If still failing, analyze diffs for patterns:
   • Check for consistent clock offsets
   • Check for step count/interval differences
   • Check for command ordering issues

Verification

./scripts/go_migration_golden.py compare --only gcode_arcs --mode strict
./scripts/go_migration_golden.py compare --only pressure_advance --mode strict

Dependencies

May be fixed by:

• [Go Migration] Fix screws_tilt_adjust.test floating-point rounding #2 (screws_tilt_adjust fix)
• [Go Migration] Fix out_of_bounds.test enable pin ordering #3 (out_of_bounds fix)
• [Go Migration] Fix bltouch.test 0.25s timing offset #4 (bltouch fix)

Parent Issue

Part of #1