feat: add data-driven skin/theme engine for CLI customization
Adds a skin system that lets users customize the CLI's visual appearance
through data files (YAML) rather than code changes. Skins define: color
palette, spinner faces/verbs/wings, branding text, and tool output prefix.
New files:
- hermes_cli/skin_engine.py — SkinConfig dataclass, built-in skins
(default, ares, mono, slate), YAML loader for user skins from
~/.hermes/skins/, skin management API
- tests/hermes_cli/test_skin_engine.py — 26 tests covering config,
built-in skins, user YAML skins, display integration
Modified files:
- agent/display.py — skin-aware spinner wings, faces, verbs, tool prefix
- hermes_cli/banner.py — skin-aware banner colors (title, border, accent,
dim, text, session) via _skin_color()/_skin_branding() helpers
- cli.py — /skin command handler, skin init from config, skin-aware
response box label and welcome message
- hermes_cli/config.py — add display.skin default
- hermes_cli/commands.py — add /skin to slash commands
Built-in skins:
- default: classic Hermes gold/kawaii
- ares: crimson/bronze war-god theme (from community PRs #579/#725)
- mono: clean grayscale
- slate: cool blue developer theme
User skins: drop a YAML file in ~/.hermes/skins/ with name, colors,
spinner, branding, and tool_prefix fields. Missing values inherit from
the default skin.
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