fix(cli): round token metrics to prevent table layout breakage

What changed

rounded token values before rendering the metrics table and updated formatTokens() to render numbers under 1K as whole integers added a unit test to assert float to integer behavior

Why

some projects produced fractional token counts (e.g. 12.7) which became string values in table cells and broke the fixed-width table borders. rounding ensures token counts are whole numbers and preserves table layout

Verification

• pnpm test passes
• pnpm lint passes
• pnpm knip passes
• If this adds a matcher: ran it against at least one real repo and confirmed the candidate count is sane

Notes for reviewer

nothing worth mentioning!