Hub internals: narrow options forwarded to getModelFile

[ysdede]

Context

Follow-up from PR #77 review triage.

src/hub.js passes { ...options, progress } to getModelFile(...), while getModelFile currently uses only revision, subfolder, and progress.

Why

• Current behavior works, but broad forwarding creates avoidable coupling
• Future getModelFile option additions could change behavior unintentionally

Proposed change

• Pass only file-download relevant keys (revision, subfolder, progress) from getParakeetModel
• Keep user-visible behavior unchanged

Scope

• Core internal cleanup only (no API signature change)

Linked PR

• feat: finalize fp16 support with strict core loading #77