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Update local cost estimator for latest task-spec#1626

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elliottslaughter wants to merge 74 commits intoflexflow:masterfrom
elliottslaughter:cost-estimator
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Update local cost estimator for latest task-spec#1626
elliottslaughter wants to merge 74 commits intoflexflow:masterfrom
elliottslaughter:cost-estimator

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@elliottslaughter elliottslaughter commented Feb 5, 2026

Stacks on top of #1625, must merge that one first.

Updates the local cost estimator for recent task-spec and local-execution updates.

The new local cost estimator is implemented in terms of ComputationGraphInstance public APIs only, so it doesn't need to be aware of any other local-execution internals.

The tests have been updated and pass on CPU but not yet on GPU.


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Refactor computation graph instance as DTG.

Cut out more stuff that doesn't compile yet.
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