Better docs for OpSpaceCompressedId

[CraigMacomber]

Description

Better docs for OpSpaceCompressedId

Reviewer Guidance

The review process is outlined on this wiki page.

[Copilot]

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

[github-actions]

Hi! Thank you for opening this PR. Want me to review it?

Based on the diff (42 lines, 2 files), I've queued these reviewers:

• Correctness — logic errors, race conditions, lifecycle issues
• Security — vulnerabilities, secret exposure, injection
• API Compatibility — breaking changes, release tags, type design
• Performance — algorithmic regressions, memory leaks
• Testing — coverage gaps, hollow tests

How this works

• Adjust the reviewer set by ticking/unticking boxes above. Reviewer toggles alone don't trigger anything.

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• After review finishes, tick Start review again to request another run — it auto-resets after each dispatch.

• This comment updates as new commits land; your reviewer selections are preserved.

• Start review