lint: wrap long lines (E501), fix F841/F821/E731 — make check fully green

All 32 findings resolved: regex literals kept single-line with noqa
(pattern IS the reviewed artifact), HTML rows string-concatenated for
line length, walrus tuple in BIP-340 verify split into named generator,
unused pytest import dropped. No behavior changes; 44/44 tests pass.
Full-gate discipline restored: ruff exit 0.

cayceops/components/publisher/images.py

@@ -15,9 +15,19 @@ WIDTH, HEIGHT = 1080, 1350
 
 _BRANDS = {
     # bitcoinhotels — warm gold on near-black
-    "bh": {"bg": (20, 18, 16), "accent": (201, 168, 76), "text": (242, 236, 224), "muted": (150, 140, 120)},
+    "bh": {
+        "bg": (20, 18, 16),
+        "accent": (201, 168, 76),
+        "text": (242, 236, 224),
+        "muted": (150, 140, 120),
+    },
     # hardcap — bitcoin orange on cool black
-    "hc": {"bg": (13, 13, 16), "accent": (247, 147, 26), "text": (250, 250, 250), "muted": (120, 120, 130)},
+    "hc": {
+        "bg": (13, 13, 16),
+        "accent": (247, 147, 26),
+        "text": (250, 250, 250),
+        "muted": (120, 120, 130),
+    },
 }