🧪 [Add edge case tests for skills Discover function]

[eshanized]

🎯 What: The testing gap addressed
The Discover function in internal/integrations/skills/discovery.go handles missing directories or invalid paths (like passing files instead of directories) but lacked tests to verify it returns a graceful empty response without panicking.

📊 Coverage: What scenarios are now tested

• Added TestDiscover_MissingSkillsSubdirectories to test cases where the base or project directories exist but the inner skills/.m31a/skills directories do not.
• Added TestDiscover_FileAsDirectory to test cases where paths point to regular files instead of expected directories.

✨ Result: The improvement in test coverage
The test coverage for edge conditions in Discover is improved, ensuring robustness and safety against filesystem variations.

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PR created automatically by Jules for task 13885243555074766371 started by @eshanized

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Summary by cubic

Added edge-case tests for the Discover function to ensure it handles missing skills subdirectories and file paths passed instead of directories. Confirms it returns an empty result without panicking.

^{Written for commit 6dcf6e2. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}