Add cross-channel invalidation support#2
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Add ChannelCascade for channel-to-channel invalidation rules with cycle rejection and precomputed transitive closure, plus CrossChannelEdges for sparse (key, channel) -> (key, channel) dependencies with forward and reverse indexing. Keep both types usable without InvalidationTracker so embedders can adopt and test the primitives independently.
Integrate channel cascades and cross-channel edges into tracker marking, including full closure for the built-in eager and lazy policies. Also add multi-channel draining, cross-channel reachability queries, and document the limits of custom policies when cross-channel follow-up is involved.
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This PR expands
invalidationwith cross-channel invalidation support.What Changed
ChannelCascadefor channel-to-channel invalidation rules.CrossChannelEdges for sparse cross-key, cross-channel dependencies.InvalidationTracker.InvalidationTracker.PropagationPolicyimplementations when cross-channel follow-up is involved.Notes
markandmark_withonly change behavior when cascades or cross-channel edges are configured.