Good First Issue: Add a paper sizing policy example

[squaeragent]

Add a deterministic paper sizing policy example under examples/ that teaches contributors how ZERO sizes proposed paper orders before they reach execution.

Acceptance:

• The example is paper-only and submits nothing directly.
• The sizing policy caps notional, handles confidence thresholds, and preserves reduce-only behavior.
• The example requires no network access, exchange credentials, wallet material, or live mode.
• Tests or a smoke command cover capped size, rejected low-confidence setup, and reduce-only path.

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Seeded from docs/launch-issues.md. Keep scope small and paper-safe.

[txhno]

ive fixed it here: #32