fix: re-throw hub error for non-markdown hub slugs

[sestinj]

Summary

Fixes issue where hub loading errors were being swallowed and replaced with "Not a markdown file" error message.

When hub loading fails for a path that looks like a hub slug (e.g., continuedev/default-hub-cloud-agent) and is NOT a markdown file, the code now re-throws the actual hub error instead of showing "Not a markdown file". This preserves the real error (e.g., network error, auth error, not found) instead of a confusing generic message.

Test plan

• Existing tests updated to match new behavior
• All tests pass locally

🤖 Generated with Claude Code

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Summary by cubic

Fixes error handling for hub slugs by re-throwing the actual hub error for non-markdown paths instead of showing "Not a markdown file", so users see the real network/auth/not-found error.

• Bug Fixes
  • Only fall back to loading from a file when the path is a markdown file; otherwise re-throw the hub error for hub slugs (owner/agent).
  • Updated tests to assert the new behavior.

^{Written for commit f644c88. Summary will update automatically on new commits.}

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Code Review Summary

⚠️ AI review failed. Please check the Continue API key and configuration.

Troubleshooting

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[cubic-dev-ai]

No issues found across 2 files

[sestinj]

🎉 This PR is included in version 1.38.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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[sestinj]

🎉 This PR is included in version 1.37.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[sestinj]

🎉 This PR is included in version 1.8.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀