fix: update stale README command examples (#239)

[microsasa]

Fixes #239

Updates the example output blocks in README.md to match the current render_live_sessions and render_cost_view implementations in report.py.

Changes

copilot-usage live table (2 fixes):

• Added the missing Est. Cost column between Messages and Output Tokens (8 columns total, matching the actual render_live_sessions output)
• Replaced raw comma-formatted token integers with K/M formatted values (468,625 → 468.6K, 483,762 → 483.8K, 1,225,990 → 1.2M) to match format_tokens() output

copilot-usage cost table (1 fix):

• Changed the "↳ Since last shutdown" row's Premium Cost from N/A to ~3 — the actual code calls _estimate_premium_cost() which returns ~{cost}, not N/A

Verification

All CI checks pass locally: ruff, pyright, and 506 tests with 99% coverage.

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[Copilot]

Pull request overview

Updates the documentation examples in README.md so the shown CLI output matches the current Rich table rendering produced by render_live_sessions() and render_cost_view() in src/copilot_usage/report.py.

Changes:

• Fixes copilot-usage live README example to include the missing Est. Cost column (8 columns total).
• Updates Output Tokens formatting in the live example to use the same K/M suffix formatting as format_tokens().
• Fixes the copilot-usage cost README example so the “↳ Since last shutdown” Premium Cost value reflects the estimated ~{cost} output (instead of N/A).

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[github-actions]

Quality Gate: APPROVED ✅

Low-impact documentation-only change — updates three stale example output blocks in README.md to match current code.

Verified against source code:

1. ✅ render_live_sessions() includes "Est. Cost" column between Messages and Output Tokens (report.py:210-212)
2. ✅ format_tokens() produces K/M formatted values (report.py:44-61)
3. ✅ _estimate_premium_cost() returns ~{cost} not N/A (report.py:153-168)

Auto-approving for merge.