Add targeted SDK boundary test coverage

[KeeganEad]

Summary

• Adds controlled Rare API integration tests for client-bound request shaping, metadata pinning, import owner precedence, and media upload handshakes.
• Adds package export smoke coverage for built @rareprotocol/rare-cli/{client,contracts,utils} subpaths plus a typecheck fixture for public exports.
• Adds focused unit coverage for Uniswap Trade API request/response boundaries, Liquid Edition deploy receipt edge cases, and shared SDK validation helpers.

Validation

• npm run lint
• npm run test:typecheck
• npx vitest run test/unit/swap/uniswap-api.test.ts test/unit/sdk/validation-core.test.ts test/unit/sdk/liquid.test.ts test/integration/sdk/package-exports.test.ts test/integration/sdk/client-api-shaping.test.ts test/unit/commands/swap.test.ts --config vitest.config.ts
• npx vitest run test/e2e/cli.test.ts --config vitest.config.ts
• npm test