Pin @github/copilot to exact 1.0.34 and regenerate lockfiles

The previous reverts only changed the spec to ^1.0.34, but the resolved entries in the lockfiles still pointed at 1.0.38 (with 1.0.38 tarballs and integrity hashes). Since ^1.0.34 satisfies 1.0.38, npm ci would still install the broken version. Pin to exact 1.0.34 in all three package.json files and regenerate the lockfiles.