chore(repo): BaseBlock Rename

[refcell]

Summary

Renames all OpBlock-prefixed types across the workspace to use a BaseBlock prefix to better reflect the project's identity. This covers the core BaseBlock type alias, as well as derived types such as BaseBlockBody, BaseBlockExecutor, BaseBlockExecutorFactory, BaseBlockExecutionCtx, BaseBlockExecutionError, BaseBlockAssembler, and BaseBlockConversionError. All usages in source files and documentation have been updated.

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
base	Ignored	Preview	Apr 4, 2026 0:52am

[github-actions]

The error display string still says "Op block" but the variant and type were renamed to BaseBlock*. Consider updating for consistency:

Suggested change

	#[error("Op block conversion error: {0}")]
	#[error("Base block conversion error: {0}")]

[github-actions]

Review Summary

Straightforward mechanical rename from OpBlock-prefixed types to BaseBlock-prefixed types across the workspace. The rename is comprehensive — no stale OpBlock type references remain in source files.

Findings

Minor: Stale error display string (crates/proof/proof/src/errors.rs:73)
The #[error(...)] string on the renamed BaseBlockConversion variant still reads "Op block conversion error: {0}". Should be updated to "Base block conversion error: {0}" for consistency. (Inline comment posted.)

Notes

• The three files with asymmetric add/delete counts (validator.rs, l1.rs, builder/core.rs) were inspected — the extra lines are solely from rustfmt re-wrapping longer identifiers. No behavioral changes.
• Internal field/variable names like op_blocks and insert_op_block were intentionally left unchanged (they're not type names), which is reasonable scope for this PR.
• The an [BaseBlock] → a [BaseBlock] grammar fix on actions/harness/src/node.rs was already flagged by a prior review comment.