Step 2 of #1815. Step 1 (instrumentation in canvas/vitest.config.ts)
already shipped — the inline comment there explicitly defers wiring
into CI to a follow-up because turning on a 70% threshold blind would
either fail CI immediately or paper over a real gap with an ad-hoc
exclude list.
This PR ships the observability half:
- Replaces `npx vitest run` with `npx vitest run --coverage` in the
canvas-build job. Coverage gets reported on every PR; no threshold
gate yet (vitest.config.ts intentionally doesn't set thresholds).
- Adds an artifact upload step for canvas/coverage/ (HTML + json-summary)
so reviewers can browse the coverage report from any PR. 7-day
retention; if-no-files-found=warn so a step skip doesn't fail.
Step 3 (thresholds + hard gate) is the natural follow-up — track in a
new sub-issue once we've seen ~5-10 PRs of baseline data and know
where current coverage sits. The issue body proposed lines:70 /
functions:70 / branches:65 / statements:70; that may need adjustment
once the baseline lands.
Closes the Step-2 portion of #1815. Step 3 stays open or gets a fresh
issue depending on your preference.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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