Release v0.51.281 — Release IW (stage-verdigris — Verdigris emerald/bronze skin #3602)

Adds the Verdigris dark-only appearance skin (emerald/forest-green + bronze-gold),
renamed from the contributor's 'Hermes Agent' to a descriptive material name per
maintainer naming convention. Registered across all 5 skin sites (config allowlist,
boot.js swatch, index.html FOUC map, i18n in 12 locales, scoped CSS palette) + test.
Also fixes the zeus i18n test (zeus is no longer the trailing skin token).

Co-authored-by: rodboev <rodboev@users.noreply.github.com>

CHANGELOG.md

@@ -3,6 +3,11 @@
 
 ## [Unreleased]
 
+## [v0.51.281] — 2026-06-05 — Release IW (stage-verdigris — Verdigris emerald/bronze skin)
+
+### Added
+- **New "Verdigris" appearance skin** — a dark-only emerald/forest-green palette (`#0F1714` background, `#121D18` sidebar) with bronze-gold accents (`#C89A5A`), named for the green-bronze patina on aged copper. Selectable in Settings → Appearance and via `/theme verdigris`. Fully scoped under `:root.dark[data-skin="verdigris"]` (no bleed into the default appearance or other skins), with component-level accents for the new-chat button, scrollbar, tool cards, tree viewer, session badges/tags, diff blocks, MCP status, and image lightbox. (#3602, @rodboev; closes #3357)
+
 ## [v0.51.280] — 2026-06-05 — Release IV (stage-p3i — Windows self-update restart fix)
 
 ### Fixed