[Provers N01] Use Custom Errors

[pepebndc]

Summary by CodeRabbit

• Bug Fixes
  • Improved error reporting with more specific error messages for validation failures, providing clearer feedback when issues occur.

[coderabbitai]

📝 Walkthrough

Walkthrough

The pull request replaces generic revert failures with five specific custom error types in the ParentToChildProver contract, improving error handling precision for validation failures including home block header mismatches, missing anchor game accounts, game proxy code issues, and root claim preimage mismatches.

Changes

Cohort / File(s)	Summary
Custom Error Declarations and Implementation src/contracts/provers/optimism/ParentToChildProver.sol	Added five custom error types (InvalidHomeBlockHeader, AnchorGameAccountDoesNotExist, InvalidGameProxyCode, InvalidRootClaimPreimage, InvalidGameProxy) and replaced corresponding generic require statements with explicit revert calls for improved error specificity in validation checks.

Estimated Code Review Effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Suggested Reviewers

• nahimterrazas

Poem

🐰 Errors now speak with crystalline voice,
Custom reverts give validators choice—
No more generic fails in the night,
Each mishap shines specific and bright! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title '[Provers N01] Use Custom Errors' directly and accurately reflects the main change: replacing generic require/revert statements with custom error definitions throughout the ParentToChildProver contract.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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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 fix/provers-N01

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No actionable comments were generated in the recent review. 🎉

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