Review everything shipped this weekend, and fix what the reviewers caught

Claude-Session: https://claude.ai/code/session_01Ms2FbjQy31TVf3CEvQhGM8

docs/superpowers/specs/2026-08-23-settings-redesign-test-backlog.md

@@ -345,3 +345,16 @@ re-checked against their files as those landed:
   constructs `SoundPage`, whose microphone test and channel strip are one
   IPC-less click away from `pw-play`. The harness exposes no method that
   triggers either; keep it that way.
+
+## Stabilization pass — 2026-08-24 — THE RUN HAPPENED
+
+Three read-only reviewers swept the whole redesign (37 findings), three fix
+waves applied them all, and the full suite then ran three times with Gabriel's
+go-ahead: 162/169, 168/169, then **169/169 green**. The seven interim failures
+were four suite-contention flakes (pass solo; theme-profiles hardened with a
+catalog-settle wait) and three contract bugs (display-layout's stale mirror
+expectation, osd-helper's non-atomic stub log + a set -u `local` expansion
+trap, sound-cards' jq context rebind). displays-contract and switcher-contract
+— the locked-session holdovers — both pass unlocked. Later phases append new
+deferred contracts below as before; this line is the baseline they diverge
+from.