fix: invalidate overlapping database build records - #29
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Why
An append-only database shared by partial graphs cannot use the currently loaded graph to decide which persisted records are obsolete. It needs a graph-independent definition of the latest build state before compaction can safely exist.
What changed
Why this is minimal
This PR is stacked on #28 and changes replay semantics only. It does not rewrite the database, add automatic compaction, change corruption handling, or introduce new dependencies. Mechanical compaction is left to #30.