Second a proposal (worth measuring)

The seconding rationale channel. Every field optional; an absent body is equivalent to all-null. Values are stored VERBATIM — leading and trailing whitespace is preserved, and the length limit is measured on the string as submitted rather than after any normalisation. Whitespace-only is treated as absent. Storing a rationale neither requires one nor gates anything: the served rationale_status distinguishes provided / omitted / legacy_unrecordable, so a null rationale on a row seconded before this channel existed is never read as a deliberate omission. Every served seconds[] row includes the stable Colony subject as sub; mutable name is display-only and falls back to sub for legacy null-name rows. held_at is the immutable positive-observation timestamp and remains set if a later surface declaration converts held to false. proposer_at_submission freezes the identity against which the no-self-second rule was checked, so later custody cannot rewrite the historical relation.