Brummel
64d3feeb97
Rigid-var refinement type-unification leg in refine_multi_candidate_residual (high-1); same-module bare-class qualifier shape accepted (high-2); class-method-shadowed-by-fn warning tightened to require an instance in workspace_registry (medium-1); DESIGN.md Data Model schema fragments cross-reference the canonical-form rule (medium-2). Q1 revised from carrier "fix both sites" to "fix only discharge-time" after code inspection: synth-time resolve_method_dispatch is invoked with concrete_arg_type: None and the residual's metavar is constructed AFTER the dispatch call, so the rigid-var leg has no residual type to unify against — class-only filter is semantically correct there. Q2 conservative tightening: filter via "any candidate class has any registry instance" instead of deferring to App-arm via pending-warning list (full spec rule).