[DataFlow runtime 2/7] DataFlow contracts + no-tensor invariant#595
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DataFlow runtime — stacked PR. Stacked on #594 — true-stacked: this PR's base is the previous PR's branch, so the diff below shows only this layer.
Part 2/7 — DataFlow contracts + no-tensor invariant.
Adds
specforge/runtime/contracts.py: small frozen records the runtime exchanges —PromptTask,FeatureSpec,SampleRef,FeatureHandle,TrainBatch,WeightVersion— plusassert_no_tensors. Stdlib-only (torch is a typing-only import) so the control plane can be reasoned about and unit-tested without the model stack.Load-bearing invariant: control-plane records (
PromptTask,SampleRef) carry metadata only — never tensors; onlyTrainBatch(trainer side) holds tensors.assert_no_tensorsmakes it checkable (tests/test_runtime/test_contracts.py). Purely additive.Part of a 7-PR series adding the DataFlow runtime (
specforge/runtime/, milestones M1–M4). Verified on current upstreammain: all subpackages import and 65 component tests pass. The integration launcher (launch.py+train_eagle3_dataflow.py) and the end-to-end equivalence gates are a deliberate follow-up, not in this series.