🧹 Reduce nesting in scan_files in cli/src/watch.rs

[Tcode-Motion]

🎯 What: Refactored the scan_files function in cli/src/watch.rs to replace deeply nested if/else blocks with guard clauses and early continue statements.
💡 Why: Reduces nesting from ~7 levels down to ~3, making the logic significantly easier to read and maintain. The logic itself remains perfectly functionally identical.
✅ Verification: Verified by building successfully and passing the full cargo test --workspace suite.
✨ Result: A more readable, flattened implementation of the directory walking logic.

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PR created automatically by Jules for task 110106201104722104 started by @Tcode-Motion

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