Fix canonical Data Liberation bundle verification

[chubes4]

Related issues

• Related to Route studio create --from URLs through Data Liberation #3952

How AI was used in this PR

• AI reproduced the bundle drift under Studio workspace dependencies, implemented the CI isolation, and ran the listed verification.

Proposed Changes

• Keep Data Liberation bundle freshness verification aligned with the canonical dependency resolution used to create the committed plugin artifacts, preventing false CI failures while retaining the real drift check.

Testing Instructions

• Run bash .buildkite/commands/run-data-liberation-checks.sh in Buildkite.
• Confirm the Data Liberation step rebuilds bundles without changes under packages/data-liberation-agent/dist.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?