Fix multi-core display bug: distribute remainder pixels evenlyv0.9.1

Fixes issue where integer division (winW / numBars) left unused pixels
on the right side of the window. The more cores displayed, the more
obvious the gap became.

Changes:
- Add barBounds() helper to calculate exact position and width for each bar
- Distribute remainder pixels evenly using scaled division
- Update drawing functions to use pre-calculated positions
- Update test to verify bars now fill entire window width

Increment version to 0.9.1

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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