[Molecule-Platform-Evolvement-Manager]
Closes step 1+2 of #1815. Step 3 (CI gate + threshold) is split into
a follow-up because today's baseline is ~46% lines / ~45% statements,
not the 70% the issue's draft thresholds assumed.
## What this lands
- `canvas/vitest.config.ts` — `coverage` block with v8 provider,
reporters: text (terminal) / html (./coverage/index.html) /
json-summary (machine-readable for tooling). NO threshold —
pure observability.
- `canvas/package.json` — adds `test:coverage` script
(`vitest run --coverage`); existing `test` script is unchanged so
the default workflow is identical.
- `canvas/package-lock.json` — adds @vitest/coverage-v8@^4.1.5 (the
v8 provider Vitest uses for native coverage).
## Why no threshold yet
Issue draft threshold was 70%/70%/65%/70% (lines/funcs/branches/stmts).
Local baseline today:
```
Statements : 45.19% (3248/7186)
Branches : 39.87% (2034/5101)
Functions : 40.99% (724/1766)
Lines : 46.36% (2905/6265)
```
Turning on a 70% gate today would either fail CI immediately or get
papered over with an ad-hoc exclude list. Better path: land
observability now, run coverage in PR review for any new code
(via the new script), gate later when the baseline catches up.
## Heatmap (from local run, top gaps)
- `src/lib/runtime-names.ts` — 0% (untouched by tests)
- `src/lib/utils.ts` — 0%
- `src/lib/canvas-actions.ts` — 25%
- `src/store/classNames.ts` — 17%
- `src/store/canvas.ts` — 73% (already-tested but the largest absolute
gap by lines)
Each is a concrete follow-up issue / PR target.
## Test plan
- [x] `npx vitest run --coverage` runs cleanly locally (~10s) and
produces `./coverage/index.html` + a `coverage-summary.json`
- [x] Existing `npm run test` workflow unchanged — instrumentation
only activates with `--coverage` flag
- [x] No production-code changes — pure tooling addition
## Follow-ups (each tracked separately; this PR keeps minimal scope)
- Step 3a — write tests for the 0% files above (~tiny each)
- Step 3b — once baseline ≥ thresholds, add `thresholds` block to
vitest.config.ts + a `npm run test:coverage` step in
`.github/workflows/ci.yml`'s Canvas job
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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