Optimizer: print candidates for a workload and diff against sketch-bench #129 #767

Change

Before the MILP lands, make both sides print the candidate set for the same query workload and compare them.

• ASAPQuery: candidate-gen-dump already prints enumerate_candidates per AQE. Extend it to print per item (AQE, T, SLAs) with family, params, W, S, query method, and eligibility after accuracy/latency filters.
• sketch-bench#129: small_problem --candidates-only --print-candidates.
• Define a small shared workload format (or a converter) so the same workloads run through both, and diff the outputs (normalizing ms vs s and sketch names).
• Expected, explainable differences: scrape-interval alignment, Subtract, families present on only one side. Anything else is a bug on one side.

Part of #753.

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