docs(agent): #89 slice 2 done (EasyEffects icon); Signal pixmap open

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

agent/BACKLOG.md

@@ -53,16 +53,20 @@ Slices:
    registered tray host* before starting (the old After=waybar.service
    ordering was inert — waybar is supervisor-run, not a unit), so the
    icon no longer vanishes on unlucky boot order.
-2. **Override layer:** an HM-managed shadow icon dir that wins the XDG
-   lookup for the session icon theme (e.g. `xdg.dataFile
-   "icons/<theme-iconset>/…"` shadowing the store copy, or a
-   `Nomarchy-tray` theme inheriting the active set — pick whichever
-   survives theme whole-swaps; icons must follow the active theme per
-   THEME-DESIGN, not hardcode one palette). Ship monochrome SVGs for the
-   name-based offenders found in slice 1. Waybar restart re-resolves.
+2. **Override layer — DONE (EasyEffects, 2026-07-12, f9d5e2c…b98248f).**
+   Chosen mechanism: a `Nomarchy-icons` child theme (built in
+   `modules/home/theme.nix`) that `Inherits` the resolved icon set and
+   becomes the session icon theme; a scalable, palette-`text`-coloured
+   monochrome override out-resolves the parent's fixed-size icon at every
+   size while all other icons fall through. Single shared layer → holds
+   for every theme (all resolve to Papirus-*), colour regenerated per
+   switch. V3 in Boreal (Bernardo confirmed). Extend to a new name-based
+   offender = one more SVG in `scalable/apps`.
 3. **Pixmap apps:** document (or wire, where a setting exists) per-app
    monochrome/tray options; what can't be fixed goes in the item's
-   record, not silent scope creep.
+   record, not silent scope creep. **Signal** is the live example
+   (`:1.227`, generated pixmap → shows as its full-colour blue round
+   icon on the bar); still open.
 
 V-path: V1 eval + icon file lands in the right lookup dir; V3 screenshot
 of the tray on a real session (headless VM has no flatpak chat apps).