define the composable instrument standard

[0xgleb]

Motivation

Nth Market needs a stable boundary between its shared orderbook and the economics of perpetuals, options, fund products, and managed strategies before those implementations harden incompatible assumptions.

Solution

• Rename the project-facing brand from Strike to Nth Market and remove stale naming notes.
• Specify account-bound net positions, instrument-owned lifecycle transitions, and atomic fill obligations.
• Keep matching economically ignorant while preserving permissionless third-party instruments and a future cross-chain strategy seam.

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/composable-instruments

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