`workflow resolve` printed two lines through `console.print`, which has
Rich markup enabled, without escaping:
1. The layer tier was wrapped in literal brackets:
`f" • [{layer.tier}] {layer.source} ..."`. Rich parsed `[base]`
and `[project-overlay]` as style tags, so the tier label was swallowed
on *every* invocation -- no untrusted input required. The column has
never rendered.
2. Step attribution interpolated `composed.step_id` raw. Step IDs come
from base-workflow / overlay YAML and are only validated against `:`
(see `_parse_edit`), so brackets pass validation. A balanced
`[stuff]` is silently swallowed; an unbalanced `[/red]` raises
`rich.errors.MarkupError`, producing an uncaught traceback and exit 1
-- the workflow cannot be inspected at all.
Route the interpolated fields through `rich.markup.escape` and escape
the literal tier bracket as `\[`, matching the existing pattern in
`workflow info`'s step graph and `workflow_list`'s `\[disabled]`.
Only display is affected; the returned payload was already unescaped and
is unchanged.
Adds 3 regression tests, all of which fail without the fix: the tier
label renders, and a step ID survives both the swallowing and the
crashing markup cases.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Assisted-by: Claude Opus 5 (1M context)
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