feat(themes): kiln + kiln-clay — the third exclusive pair, brand new

Completes the three dark/light pairs for v1 (batch: 0ba1762, e51c8a7).
Kiln is a potter's workshop at night, lit only by the kiln: warm
near-black (#1D1815), copper accent (#D68C5C, 6.5:1), brass accentAlt,
CaskaydiaCove, rounding 8. Kiln Clay is the same studio at midday:
cream plaster (#F4EDE3), espresso text (11.1:1 AAA), fired-copper
accent (#A34F1F, 4.89:1), brick-red bad. Both waybars are a NEW
whole-swap identity — 'the workbench': ONE continuous floating plank
(window#waybar carries the surface, modules transparent) — deliberately
distinct from boreal's three pills and slate's edge-to-edge strip;
module set verbatim-parity with the generated config. Matched rofi,
btop themes. The wallpapers share identical ring geometry — banked-coal
heat rings at night, terracotta glaze rings at noon — so the autoTheme
flip visibly rhymes.

Sync sweep in this commit (LOOP §5): README 24->28 presets + the
whole-swap list now names the three pairs; CONVENTIONS waybar parity
list gains the four new slugs; OVERRIDES autoTheme table points at the
pairs; HARDWARE-QUEUE gains the batch V3 entry (real-GL blur, btop
visual, launcher grid, tray menus, pair flip); BACKLOG files #153
(PROPOSED: per-theme desktop widgets — the conky idea, engine spike
needed, not v1).

Verification: V2. Full targeted set green on the final tree:
theme-contrast, theme-wholeswap (previews + backgrounds + CSS
self-containment), waybar-language, waybar-swap-env, rofi-text-width,
state-sync-validate, auto-theme VM; nix flake check --no-build green.
Visual protocol: theme-shot VM desktop + menu viewed for BOTH themes
(plank renders as one island, copper/terracotta semantics, legible
menus; /nix/store/2fizd945...theme-shot-kiln and
/nix/store/0126yd48...theme-shot-kiln-clay). audit-theme-design:
CVD-only findings (≤ executive-slate's own baseline); ANSI slots
in-family after the magenta retune. V3 pending: HARDWARE-QUEUE entry
above. btop visual is VM-blocked (GL terminal never starts under
softGL) — file-level assertions only, listed for hardware.

Design + wallpapers on Fable; assets by a Sonnet subagent to a written
identity spec; reviewed on Fable.

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

agent/BACKLOG.md

@@ -129,6 +129,21 @@ high-ROI, etc.) live in the journal + ROADMAP — not here.*
 
 ### Product / day-2
 
+### 153. Desktop widgets (clock / system stats) as an opt-in per-theme surface
+
+Pitch (filed while shipping the three exclusive theme pairs, 2026-07-18):
+themed desktop widgets — a clock, calendar, or system-stats panel living on
+the wallpaper, conky-style — would deepen the identity themes (imagine
+kiln's copper stats panel or executive-ivory's letterhead clock). No such
+surface exists today, so it is a NEW theming surface: per CONVENTIONS it
+must consume the palette from the state JSON (no side pipeline) and ship
+as an opt-in `nomarchy.*` toggle with a commented template example. Engine
+choice is the real decision — conky is X11-era; a Wayland layer-shell
+widget system (eww or a small QML/GTK layer-shell tool) fits the stack
+better. Cost: moderate (engine spike + palette bridge + 2–3 widget
+layouts; start with the exclusive pairs only, not all 28 themes). Value:
+v1+ polish, not a v1 blocker.
+
 ### 146. `[watch]` hypridle hangs instead of exiting when its compositor vanishes
 
 **Rewritten 2026-07-16, hours after filing: the premise was disproven and almost