Phase 5 of the shell theme system (THEME_SYSTEM_PLAN.md §11): a second
builtin, demo 02's flush edge-to-edge bar with pill workspaces, a plain
date+time clock, and cpu/ram chips instead of the media widget.
- bread-theme/assets/shell/glass-workbench/: theme.toml + CSS template,
faithful to bos-ui-demos/02-glass-workbench.html. Accent maps to the
`green` palette token (flat, not a gradient) rather than a hex literal,
so pywal theming still works.
- builtin.rs: generalized from a single hardcoded liquid-motion constant
pair to a small BuiltinTheme registry (builtin::ALL / builtin::find),
so mod.rs's discovery/list()/resolve_builtin no longer special-case one
id. liquid-motion stays the pinned fallback in resolve_builtin().
- manifest.rs: KNOWN_MODULES gains "cpu"/"ram".
- types.rs: new Tokens::bar_border() ("full" default vs "bottom") so a
flush bar can ask for a single hairline instead of an island's full
border.
- Tests: builtin loads, appears in list() alongside liquid-motion, and its
window spec is the flush/edge shape (36px, zero margin, radius 0).
cargo test -p bread-theme --lib: 63 passing (59 prior + 4 new).
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