add the composable instrument matching kernel

[0xgleb]

Motivation

The composable-instrument ADR needs an executable package boundary that lets permissionless instrument implementations reuse one orderbook without trusting wrappers to settle generic positions correctly.

Solution

• Rename the Move and backend packages to nth and extract fixed-point quantity types into the standalone units package.
• Add a bounded generic CLOB, market-owned account-bound net positions, and non-droppable fill obligations with a private settlement cursor.
• Prove the external interface with independent linear and expiring instrument wrappers plus adversarial lifecycle tests.
• Run all three Move packages in CI with every action pinned to an immutable commit SHA.

Made with Cursor

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/instrument-kernel

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