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>

docs/OVERRIDES.md

@@ -67,7 +67,7 @@ State lives in `settings.autoTheme`:
 | Field | Meaning |
 |---|---|
 | `enable` | on / off |
-| `day` / `night` | theme slugs — e.g. `summer-day` / `summer-night` (see `nomarchy-state-sync list`) |
+| `day` / `night` | theme slugs (see `nomarchy-state-sync list`) — the exclusive pairs are made for this: `boreal-dawn`/`boreal`, `executive-ivory`/`executive-slate`, `kiln-clay`/`kiln`, `summer-day`/`summer-night` |
 | `sunrise` / `sunset` | switch times, `"HH:MM"` (24-hour) |
 
 A timer re-checks every ~15 minutes: the day theme applies around sunrise, the