fix(minibf): Add mainnet genesis block

[gonzalezzfelipe]

Summary by CodeRabbit

Release Notes

• New Features
  • Mainnet network support is now fully available with complete genesis configuration and blockchain initialization, enabling users to interact with the mainnet alongside existing preprod and preview networks.

[coderabbitai]

📝 Walkthrough

Walkthrough

This pull request adds mainnet support to genesis block handling in the minibf crate by introducing a new constant for mainnet genesis hash and implementing a dedicated function to construct mainnet genesis blocks, extending existing domain-based genesis resolution logic.

Changes

Cohort / File(s)	Summary
Mainnet Genesis Support crates/minibf/src/hacks.rs	Added GENESIS_HASH_MAINNET constant; extended genesis_hash_for_domain to include mainnet network magic mapping; extended genesis_block_for_domain to delegate mainnet requests to new genesis_block_mainnet function; implemented genesis_block_mainnet to construct BlockContent with Byron/Shelley utxos, fixed timestamp, mainnet genesis hash, and next block reference.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• fix: Improve conformance tests coverage #853: Previously added preview and preprod genesis block logic; this PR extends the same genesis handling functions to support mainnet following the established pattern.

Suggested reviewers

• scarmuega

Poem

🐰 Mainnet joins the genesis fold,
With hash constants, bold and bright!
Preprod and preview now have kin,
Byron and Shelley dance in light,
The blockchain's story starts just right! ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: adding mainnet genesis block functionality to the minibf crate, which aligns with all modifications to hacks.rs.

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✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/add-mainnet-genesis-block

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