test(cli-core): add unknown command remediation copy tests (#194)

[aipd506]

Fixes #194

Summary of Changes

1. Added comprehensive unknown command remediation copy tests in tests/unknown-command-remediation.test.ts.
2. Verified unknown commands fail consistently with concise usage copy and root description.
3. Ensured valid v1 command inventory (doctor, new, dev, test, deploy) is discoverable in remediation output.
4. Verified no post-v1 commands (such as add, plugin, plugins, remote-template, templates, generate, build, serve, publish, compile, contract) are advertised or registered.
5. Verified CLI binary execution conformance mapping unknown commands to validation exit code 2 while preserving zero exit code for no argument runs, --help, and --version.

Testing

1. Vitest test suite tests/unknown-command-remediation.test.ts completed with 41 passed tests and zero failures.
2. Static typecheck via npm run typecheck completed with zero TypeScript errors.
3. ESLint verification via eslint . completed with zero errors or warnings.
4. Prettier formatting check verified across all modified files.

Security

1. Unknown command remediation ensures unknown positional arguments do not invoke unintended system operations or execute untrusted code paths.
2. Process error handling bounds exit codes gracefully without leaking process internals or stack traces.

[coderabbitai]

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