Follow-up to #285. Violet sits close to the terminal's own dim foreground,
so the arcs lost contrast exactly where they cross text, which is most of
their length. Blue reads at a glance on the dark skins and on the light
ones.
Colour still comes from a token every skin block already defines and tunes
for its own background (--session-blue instead of --session-purple), so it
stays one rule for all seven skins with no per-skin override, and the two
blues are not even the same: --session-blue is per palette while the
subagent rule hardcodes #3b82f6.
Hue no longer separates this layer from the subagent lines, so the
separation now rests entirely on shape (a lineage arc hangs under the strip
and never reaches a window), weight and dash pattern. Noted in the rule.
CSS only: no geometry, no markup, no settings.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Codeman maintainer
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