PR #98628 removed _build_chunk_digests, so the two lean chunk-digest
cancellation tests reintroduced by the #97512 cherry-pick target a
deleted mechanism — removed. The #96775 stall-interrupt assertions now
match the stall_interrupted marker inside the strategy/kind-stamped
durable error instead of assuming it is the prefix.
Pin both AuxiliaryExplicitCancellation and commit-fence cancellation, keep early /stop cooldown-neutral, merge with a longer live deadline, and prove force=/compress still bypasses the automatic brake.
Teknium