fix(debarrel): Fix cloud readdir startsWith crash

[alexbit-codemod]

Summary

• Cloud runs crashed in walkProjectSourceFiles with cannot read property 'startsWith' of undefined while checking whether barrels must be preserved
• Cause: curated fs readdirSync({ withFileTypes: true }) entries did not always expose a usable .name
• Fix: list directories with plain readdirSync, normalize string/Dirent names safely, and fall back to statSync for directory checks

Test plan

• pnpm test in codemods/debarrel (283 passed)
• Re-run debarrel on the same cloud target and confirm the Runtime initialization / startsWith error is gone
• Merge Version Packages after this lands so 0.7.13 publishes

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