chore: add inline-docs for avoiding confusion

[roynalnaruto]

Purpose or design rationale of this PR

Add inline documentation for avoiding confusion in da-codec vs zkvm-prover's implementation around stf-version and codec variants.

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change
• Yes

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch chore/galileo-comments

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