graph: refactor: one actor owns every write to the graph and cache index - #602
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…erivations after it
…workers in the cache test
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Closes #596. Stacked on #600: a graph actor under the root is the sole writer of the dependency graph and cache index, one transaction per message, ingest batches coalesced with a savepoint each, and known-derivations queries answered after the writes queued before them.