visual-test label step fails; cascades skip screenshot.

[opencode-agent]

Issue filed: #978 (label visual-test).

Key finding: The workflow doesn't fail in the rendering code at all. Step 8 "Ensure visual-test label exists" in .github/workflows/visual-test.yml:55-69 exits non‑zero in ~2s on every run since #977. That cascades into skipping the Lavapipe setup, the screenshot run, and artifact upload — which is why build-output.log and screenshot.png are missing from this workspace. The other opencode workflows (opencode-audit.yml, opencode-test-writer.yml) already route this through scripts/ensure_label.sh, which degrades label‑create failures to a warning; visual-test.yml should do the same.

The issue also flags two docs drifts I noticed while cross‑reading the prompt: the diagnosis prompt still describes a PPM → PNG path, but the workflow emits PNG directly and modules/engine-graphics/src/vulkan/screenshot.zig only supports PNG/JPEG/GIF/WebP, and the screenshot gate at src/game/app.zig:556 requires screenshot_settle_frames >= 30 independent of ZIGCRAFT_SMOKE_FRAMES.

Triggered by scheduled workflow

opencode session  |  github run

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[github-actions]

kcov coverage

Line coverage ran for this PR and uploaded a non-blocking report artifact named kcov-report. Codecov upload is configured as non-blocking while the project captures a stable baseline.