455916db73
The dissolved real-data sweep member manifest carries only the swept signal axes today — no stop param; the R-path stop is a wrap_r constant baked outside the signal param_space. The existing member-line pin (sweep_real_blueprint_member_lines_pin_the_dissolved_contract) locates each binding by `find`, so it never pinned this absence. This characterization pin does, as the grounding ratification for the risk-regime-axis design pass: the resolved-regime manifest stamp will flip it to require the stop key — the ratified additive contract extension, exactly like the instrument stamp. refs #210