The drawing-card feature batch (icon/image/compare/graph/d2 cards, --stdin,
tool resolution) added widget + wiring code that dipped total coverage under
the 95% floor — surfaced by `make release` (push-check skips coverage). Cover
the gaps: ProblemsController.refresh, every SVG shape-type bbox + the style
vocabulary, _spawnD2 via a real /bin/cat, the icon-show bus path + error
branches, and quad/arc/close marker paths.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
The Problems panel flags a configured tool path (app.tools) that no longer
points at a file — a real misconfig, echoing D-58's soft floor. A merely-
unfound optional tool isn't flagged (its use-time userError covers that).
Extracted to a pure supporterToolProblems(), flutter-tested (3 cases).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>