[Tcode-Motion]

🎯 What: Removed redundant // Fix deprecation warnings comment in cli/src/commands/lint.rs and added CLI unit test for lint options.
💡 Why: The deprecation warnings auto-fix logic via migrate_source(&content) is already fully implemented immediately below the comment, making the comment obsolete.
✅ Verification: Verified via git diff and workspace test suite execution (cargo test --workspace --all-targets).
✨ Result: Cleaned up code health in lint.rs and ensured test coverage for lint --fix CLI parsing.

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PR created automatically by Jules for task 119806658328883400 started by @Tcode-Motion

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