fix(workflow): reject field-condition edges the producing kind cannot satisfy
Live repro: architect emitted a verify stage with kind=analysis and a verdict-equals edge. The kind schema doubles as the LLM response format, so 'verdict' was never emitted and the workflow failed at its final hop at runtime. The compiler now requires artifact_field_equals fields to be declared by the producing stage's kind schema, failing the plan at lock time with a pointer at review_report. Architect prompt rule added; reachability check extracted alongside the new validation.
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