Three additive quality improvements to the execution pipeline:
1. Pre-wave dependency check (execute-phase): Before spawning wave N+1,
verify key-links from prior wave artifacts. Catches cross-plan wiring
gaps before they cascade into downstream failures.
2. Cross-Plan Data Contracts dimension (plan-checker): New Dimension 9
checks that plans sharing data pipelines have compatible transformations.
Flags when one plan strips data another plan needs in original form.
3. Export-level spot check (verify-phase): After Level 3 wiring passes,
spot-check individual exports for actual usage. Catches dead stores
that exist in wired files but are never called.
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