Integrate jcode into vibepod-cli

[nezhar]

Summary

Integrate support for @1jehuang/jcode into vibepod-cli so users can leverage the repository's capabilities from the CLI workflow.

Motivation

Users should be able to use jcode directly from vibepod-cli without manual setup or custom scripts. A native integration will reduce friction and improve developer experience.

Scope

• Evaluate integration points between vibepod-cli and jcode
• Add a new command/subcommand or provider hook for jcode
• Implement configuration handling for jcode usage
• Add error handling and user-facing messaging for integration failures
• Document setup and usage in README/docs

Acceptance Criteria

• vibepod-cli can invoke jcode through a documented CLI command or workflow
• Integration behavior is covered by tests
• Documentation includes prerequisites, configuration, and usage examples
• Integration failures produce actionable error messages

References

• Target integration repo: https://github.com/1jehuang/jcode

[nezhar]

PRs VibePod/vibepod-agents#15 and #121