build-pointers: use the unified rainix-copy-artifacts reusable

[thedavidmeister]

Repoint the pointer-artifact check at the unified rainix-copy-artifacts reusable (rainlanguage/rainix#201): it runs BuildPointers.sol (CopyArtifacts is skipped — no such script here) and asserts committed pointers still match. Replaces the standalone rainix-build-pointers reusable, being retired in favor of a single artifact action.

Adds secrets: inherit so CACHIX_AUTH_TOKEN flows through (the old caller didn't pass it).

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: ebe2907e-b835-4fe4-aa42-289cdb2bdaad

📥 Commits

Reviewing files that changed from the base of the PR and between 0ece0c6 and 328a76b.

📒 Files selected for processing (1)

• .github/workflows/build-pointers.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-27-retire-build-pointers

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