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The default desktop showed a red Hyprland config-error banner on every boot, occluding the Waybar. Root cause: Hyprland 0.53 rewrote window rules — the `windowrulev2` keyword is a hard error and the old rule-first order (`float, class:^…$`) no longer parses, so the float rules were not applying either. Confirmed against the Hyprland 0.55.4 source (`handleWindowrule`): each comma field is now `<keyword> <value>`, so effects carry a value and matchers take a `match:` prefix. Migrated the 7-rule block to `float 1, match:class ^…$` form. Verified: V0 nix flake check --no-build; built the generated hyprland.conf; V2 theme-shot re-render — banner gone, themed Waybar renders. Journal + MEMORY gotcha added. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>