[cheggaaa]

The legacy diff hash key (oh) is dead since diffsync V2 removal (#231), but stale values written by older versions stay in existing space docs forever, and SetSpaceStatus(Remove) still writes an oh: null field into docs that never had one.

• UpdateHash deletes oh from the doc it rewrites, so legacy docs self-clean on their next hash update
• SetSpaceStatus(Remove) deletes the key instead of nulling it, so the field is never added

🤖 Generated with Claude Code

[github-actions]

New Coverage	50.9% of statements
Patch Coverage	100.0% of changed statements (6/6)

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^{Coverage provided by https://github.com/seriousben/go-patch-cover-action}