When reviewing diffs in generated query.ts files, it's often unclear why changes occur especially when the output seems correct but differs between environments. Currently, we only track the @gel/generate version in the generated files, but two other factors can affect the output: the Gel server version and the current migration hash.

Problem:
Without this metadata, it's difficult to diagnose whether a diff is due to a code change, a different server version, or a migration state mismatch. This leads to confusion and extra investigation when reviewing generated code.

Proposal:

• Add the Gel server version and (optionally) the current migration hash to the generated file metadata.
• Consider moving this metadata to a separate file (e.g., a lock file) to reduce noise in diffs and make it easier to track which files were actually changed.
• Optionally, include file content hashes in the metadata file to help identify stale or orphaned generated files.

Benefits:

• Makes it easier to understand and audit changes in generated files.
• Helps teams quickly identify environment mismatches or migration issues.
• Reduces confusion and time spent investigating "mysterious" diffs.