Clarify tensor disposal comment on blank token emission

[ysdede]

🧹 [code health improvement description]
🎯 What: Rewrote the code comment in src/parakeet.js explaining tensor disposal logic for blank tokens, changing "newState is unused" to "free the new state tensors".
💡 Why: A comment explicitly declaring a variable as "unused" when it is actually being utilized for essential resource cleanup (passed to this._disposeDecoderState) is misleading and frequently triggers false-positives in code scanners or static analysis tools. The updated comment accurately reflects that the variable's tensors are being safely freed without falsely labeling the variable itself as unused.
✅ Verification: Verified that npm run test executes perfectly with no newly introduced failures or regressions.
✨ Result: Enhanced the codebase by removing a potential source of code health noise and improving documentation clarity while strictly preserving existing tensor management behavior.

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PR created automatically by Jules for task 8264978234621761824 started by @ysdede

Summary by Sourcery

Chores:

• Update an internal code comment to correctly describe freeing tensors for unused decoder state on blank token emission.

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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