USR369 identified a real gap: LEGACY-XX.md accumulates history correctly via automatic JANUS/CLOSE.php append, but handoff-XX.md never gets pruned of resolved items -- it only grows, and the shrink-guard (meant to prevent accidental loss) makes deliberate cleanup require an ad-hoc override each time, which discourages it. Wrote SOP-HANDOFF-HYGIENE.md: every system, every handoff write, sorts each item into still-open (keep) / resolved-and-worth-keeping (verify it's actually in LEGACY or a logged decision, append first if not, then remove from handoff) / resolved-and-routine (drop, no LEGACY entry needed). Shrink-guard still requires USR369's yes every time -- this SOP makes pruning a routine verified step, not a bypass.