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>

themes/kiln.json

@@ -0,0 +1,60 @@
+{
+  "version": 1,
+  "name": "Kiln",
+  "slug": "kiln",
+  "mode": "dark",
+  "wallpaper": "",
+  "colors": {
+    "base": "#1D1815",
+    "mantle": "#151110",
+    "surface": "#2C241E",
+    "overlay": "#41362D",
+    "text": "#EADFD3",
+    "subtext": "#B5A695",
+    "muted": "#77685A",
+    "accent": "#D68C5C",
+    "accentAlt": "#C8A94E",
+    "good": "#A0B36A",
+    "warn": "#E0A458",
+    "bad": "#E26D5A"
+  },
+  "border": {
+    "active": "accent",
+    "inactive": "overlay"
+  },
+  "fonts": {
+    "mono": "CaskaydiaCove Nerd Font",
+    "ui": "Inter",
+    "size": 11
+  },
+  "ui": {
+    "gapsIn": 5,
+    "gapsOut": 12,
+    "borderSize": 2,
+    "rounding": 8,
+    "iconSize": 40,
+    "activeOpacity": 1.0,
+    "inactiveOpacity": 0.94,
+    "terminalOpacity": 0.93,
+    "blur": true,
+    "shadow": true
+  },
+  "ansi": [
+    "#2C241E",
+    "#E26D5A",
+    "#A0B36A",
+    "#E0A458",
+    "#90A9C8",
+    "#BC8FC6",
+    "#9FBFAE",
+    "#EADFD3",
+    "#77685A",
+    "#EB8272",
+    "#AFC17C",
+    "#E8B46E",
+    "#A3B8D4",
+    "#CBA3D4",
+    "#B0CCBD",
+    "#F4EDE5"
+  ]
+}