The output tag was tinted by submission mode for every line kind, so a
[system] line and an [error] line rendered with an identical leftmost
tag — distinguishable only by body colour. And flooding the whole error
body in red made long messages hard to read.
Colour the tag by message status instead (its OutputKind): [system] →
green, [error] → red; the echo tag keeps the mode tint (ADR-0037's
actual purpose — per-command success rides the ✓/✗ marker). Bodies go
neutral; the error body stays bold for weight (rustc-style: severity-
coloured label, readable bold message). Yields a status traffic-light
matching the ✓/✗ palette.
Narrows ADR-0037's mode side-channel to the echo line it was always for.
ADR-0037 Amendment 1; closes the tag-colour gap ADR-0040 flagged as OOS.
claude@clouddev1
ae57c6fc82