feat: plan registered workloads and preserve shared producer bindings - #515
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Before this PR
Canonical startup selected each query separately; physical node bindings were query-local.
After this PR
Search same-accuracy workload cohorts through Planner CSE and replacement strategies, retain every root, share structurally equal selected producers using ProjectASAP/ASAPPlanner#356, and bind them across the workload. Collector producer IDs are state-based rather than consumer-based. Unsupported roots retain explicit fallback, and query roots participate in plan identity.
Dependencies
Stacked on #514 and pinned to Planner #356. This implements slice B for canonical startup; it does not claim fused SUM/COUNT execution or joint workload cost evidence is finished.
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