chore: fix C lint errors (issue #15996)

[satyamsrivastava43-sketch]

Resolves #15996.

Description

Makes read-only input pointers in i32_to_f64, f64_to_i32, and generate const-correct to resolve the reported C lint errors.

Related Issues

resolves #15996

Questions

No.

Other

git diff --check passes. The project C lint workflow was not run locally.

Checklist

• Read, understood, and followed the contributing guidelines

AI Assistance

• Yes
• Code generation
• Research and understanding

Disclosure: OpenAI Codex analyzed the issue and drafted these const-qualifier changes.

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