fix(themes): P2 contrast floors retuned + gated across 9 themes (item 28b done)

18 hex retunes, hue-preserving OKLCH minimal raises except where the
upstream palette defines a canonical value: muted lifted to >= 2.0 on
lumon/white/retro-82/everforest (solved), gruvbox (bg4 #7c6f64), nord
(#616e88, the community comment-brightening), catppuccin-latte
(overlay1 #8c8fa1); text-on-surface >= 4.5 via surface nudges
(ristretto darker, latte lighter); accentAlt >= 3.0 (latte, summer-day
darkened); warn >= 2.5 — the bar's battery tint — darkened on the
light bases (latte, rose-pine dawn, summer-day) and flexoki-light's
four status colors moved to their canonical light-mode 600 series.

check-theme-contrast.py now gates all four adopted floors (7 pairings
x 21 themes, green). good/bad stay audit-only — identity themes sit at
2.0-2.3 there by design, so no exemption mechanism was needed. The
design audit's contrast findings drop 20 -> 1 (miasma's earthy `bad`,
kept as identity). Item 28 slice (b) complete.

Verified: V0, checks.theme-contrast green, flake check green,
re-audit. Rendering is V3 -> HARDWARE-QUEUE eyeball entries.

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

tools/check-theme-contrast.py

@@ -26,6 +26,14 @@ PAIRINGS = [
     # shipped subtext == base (ratio 1.0 — invisible secondary text; the
     # palette-level cause of items 25/27). Never again.
     ("subtext", "base", 3.0, "secondary text (tooltips, hints, fastfetch labels)"),
+    # Item-28 P2 floors (all 21 themes retuned to pass, 2026-07-05).
+    # warn IS held to a floor — it's the bar's 25%-battery color and the
+    # low-battery toast tint; good/bad stay audit-only (identity themes
+    # sit at 2.0–2.3 there by design — see tools/audit-theme-design.py).
+    ("muted",   "base",    2.0, "dimmed text (inactive workspaces, muted volume)"),
+    ("text",    "surface", 4.5, "text on chips / raised rows"),
+    ("accentAlt", "base",  3.0, "alt-accent glyphs"),
+    ("warn",    "base",    2.5, "battery warning tint (bar + toast)"),
 ]