Code operations commands and improved error handling

[clavery]

Summary

• Add code management commands: deploy, list, activate, delete, watch
• Add CartridgeCommand base class for shared cartridge-related flags
• Fix OCAPI OpenAPI spec for proper openapi-fetch typing (success/error discrimination)
• Improve error handling with Error.cause for structured OCAPI errors
• Add catch() to BaseCommand for consistent error logging and exit codes
• Fix ./cli wrapper to preserve exit codes

Code Commands

• code deploy - Deploy cartridges to a code version
• code list - List all code versions on an instance
• code activate - Activate a code version
• code delete - Delete a code version (with confirmation prompt)
• code watch - Watch and sync cartridge changes

Error Handling

Library functions now throw errors with the OCAPI fault in cause:

throw new Error('Failed to delete code version', {cause: error});

BaseCommand catches errors, logs them with structured logger (including cause), and uses oclif's this.error() for proper exit codes.

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• Tests pass (pnpm test)
• Code is formatted (pnpm run format)

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