chore: bump version to 0.3.0

[agent-smith-k]

Summary

• Bump version from 0.2.3 to 0.3.0

What's in 0.3.0

Futures paper trading (kraken futures paper)

Complete derivatives simulation engine with 17 new subcommands mirroring live kraken futures order:

• Order types: market, limit, post, stop, take-profit, ioc, trailing-stop, fok
• Position management: long/short positions, position aggregation/netting, reduce-only orders
• Margin and leverage: 1x-200x leverage, margin tracking, per-symbol leverage preferences
• Risk simulation: liquidation simulation based on mark price, funding rate accrual
• Order management: edit, cancel, cancel-all, batch-order
• Full isolation: separate state from spot paper, no API credentials required

Spot paper slippage simulation

• Optional flat-rate slippage for spot paper market orders via --slippage-rate

Other

• Config file permissions TOCTOU fix
• Contribution guidelines and public sync docs

Changes

• Cargo.toml: version 0.2.3 -> 0.3.0
• Cargo.lock: updated automatically

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