fix(checks): restore reinitializer checker

[Mabolla]

Summary

• restore the missing scripts/checks/reinitializer checker referenced by just reinitializer-check-no-build
• adapt the checker to use this repository's local scripts/checks/common package
• restore the local just check / just pre-pr path without changing the existing recipes

Why

just check currently invokes go run ./scripts/checks/reinitializer, but that package is absent from the tree, so the check chain aborts before later checks can run. The checker existed when the contracts were imported into this repository and the equivalent implementation still exists upstream in Optimism, which indicates the missing package is the regression rather than the justfile target.

Closes #410.

Validation

• git diff upstream/main...HEAD --check
• verified the branch differs from main by exactly one added file: scripts/checks/reinitializer/main.go
• local go test ./scripts/checks/reinitializer could not be run because Go is not installed in the Windows environment used for this contribution

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/2	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 1 Sum 2