* op-supervisor: bugfix timestamp Check

* supervisor: include Invalid in SafetyLevel Validation

* supervisor: check if BlockSeal is found when iterator stops

* Don't rewind iterator if Traversal yields ErrStop

* Add Timestamp Invariant Test to E2E

* update unit test

* pr comments re:error message

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Co-authored-by: protolambda <proto@protolambda.com>