docs: replaced remaining Guard.with_tiny() references with Guard(mode…

[cookieshop02]

Closes #148

Summary

Successfully replaced "(Guard.with_tiny())" in two remaining files(i.e. CONTRIBUTING.md and assets/hf-org-card/README.md) with "Guard(model='tiny')".

Checklist

• The issue this closes was assigned to me (see CONTRIBUTING.md)
• This is my only open PR (one issue at a time, see CONTRIBUTING.md)
• Target branch is dev (see BRANCHING.md)
• cd sdk && make check-ci passes locally
• New code has tests (every module gets a test file)
• Public API changes are reflected in sdk/README.md / sdk/docs/
• No secrets, internal URLs, or private paths in the diff
• If a model wrote a meaningful part of this, I said so below (AI_POLICY.md)

[greptile-apps]

Greptile Summary

Updates the remaining deprecated Guard.with_tiny() documentation examples to use the current Guard constructor.

• Replaces the contributing guide’s legacy tiny-model reference.
• Updates the Hugging Face quickstart to enable automatic tiny-model download explicitly.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
CONTRIBUTING.md	Replaces the deprecated helper reference with the equivalent current constructor syntax.
assets/hf-org-card/README.md	Uses the current constructor and explicitly enables automatic model download, resolving the previously reported documentation issue.

_{Reviews (2): Last reviewed commit: "fix: preserved auto-download in hf-org-c..." | Re-trigger Greptile}