Declared value/range metadata (`NavRange`) for slider/progress/numeric roles. Feature 100 (R5): declared range metadata for value/range roles — the SOLE source of step/bounds, replacing the host's hardcoded 0.1 / 0..1 slider constant (FR-002). A DEFAULT-step slider declares { Step = 0.1; Min = 0.0; Max = 1.0 } so the pre-R5 numeric path is reproduced byte-identically (FR-007). Validation: Min <= Max; Step > 0.