__fish_palette's c_cmd/c_flag/c_arg/c_dim now read fish's own highlighter
variables (fish_color_command/option/param/autosuggestion) when set, and
c_head reads the pager's fish_pager_color_prefix, so --help text matches
whatever the user's actual theme renders at the prompt instead of a fixed
guess at it. Each role keeps its previous static value as a fallback
(e.g. a --no-config script, or the theme variable being unset or empty).
Routes __fish_help_header's title/section colors and config-help's,
gi's, and git-clean's own hand-rolled --help blocks through the palette
instead of their hardcoded set_color calls, which fixes the
--help-vs-actual-prompt color mismatch across most of the config's
functions in one place (__fish_help_header backs the majority of
user-facing --help output).
Also fixes role mismatches found along the way: several already-palette
functions (dockup, fish-deps, pkg, play-media, dng2avif) were coloring
their <placeholder>/[bracket] argument text with c_dim instead of c_arg,
and scrub's "Aggressive Targets:" heading was still a hardcoded
set_color call sitting next to an otherwise-converted help block.
Declared --no-scope-shadowing with a bare set, so the 12 colour roles land
in the caller's scope under the same short names the consuming functions
already interpolate. Keeping the names means the conversion never edits an
output string in 33 of the 38 consumers.
No consumer is converted yet; byte-identity harness still reports 29/29.
rootiest