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Fix structural first. Structural errors can block safe return. Geometric warnings ask for visual review. Lint warnings usually mean an agent should make a smaller or cleaner edit.

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CodeTierSeverity
EMPTY_DIAGRAMstructuralerror
UNRESOLVABLE_SCHEDULEstructuralerror
EDGE_MISANCHOREDstructuralerror
OFF_CANVASstructuralerror
GROUP_BREACHstructuralerror
UNKNOWN_SHAPEstructuralwarning
LABEL_OVERFLOWstructuralwarning
NODE_OVERLAPgeometricwarning
ROUTE_SELF_CROSSgeometricwarning
ROUTE_HITCHgeometricwarning
ROUTE_UNEXPLAINED_BENDgeometricwarning
ROUTE_LABEL_ON_SHARED_TRUNKgeometricwarning
ROUTE_CONTAINER_MISANCHORgeometricwarning
ROUTE_SHAPE_MISANCHORgeometricwarning
ROUTE_STALE_AFTER_NODE_MOVEgeometricwarning
DUPLICATE_EDGElintwarning
UNREACHABLE_NODElintwarning
DECISION_BRANCH_UNLABELEDlintwarning
COMMENT_DROPPEDlintwarning
UNSUPPORTED_SYNTAXlintwarning
CONTENT_DROPPED_ON_ROUNDTRIPlintwarning