Replace sliced PR 664 Krulwich Hoogerland and ring snippets #698

Adversarial review on PR #664 at edd0dac flagged distinct-looking snippets cut from the same source sentences: Krulwich pH-homeostasis slices reused across ph_delta_mid3, ph_delta_very_low, and ph_phenotype_with_numerical_limits; Hoogerland membrane-fluidity abstract slices reused across temperature_range_mid4 and temperature_range_mid3; and ring_shaped reusing the CrvA/Crescentin sentence for two edges. Replace them with independent support for each edge, or drop unsupported optional snippets.