test: reach 80% vitest coverage thresholds across the monorepo

[ascariandrea]

Goal

All packages and services should reach 80% vitest coverage (statements, branches, functions, lines). The thresholds are enforced in CI via PR #3334 — builds will fail until each package meets its target.

Sub-issues

Package / Service	Stmts	Branch	Fns	Lines	Tracking issue
@liexp/ui	95.9% ✅	85.2% ✅	95.8% ✅	97.9% ✅	— already passing
@liexp/shared	63.9%	58.9%	56.8%	63.5%	#3335
@liexp/io	58.3%	100% ✅	37.5%	65.0%	#3336
@liexp/backend	20.6%	11.9%	12.3%	20.9%	#3337
agent	85.9% ✅	73.5%	96.8% ✅	85.8% ✅	#3338
admin	~0%	~0%	~0%	~0%	#3339
web	0%	0%	0%	0%	#3340
api	skipped (needs DB)	—	—	—	—
worker	skipped (needs DB)	—	—	—	—

How to run coverage locally

# Single package
pnpm --filter @liexp/shared test:coverage

# All packages (excluding api/worker which need a DB)
pnpm --filter @liexp/ui test:coverage
pnpm --filter @liexp/shared test:coverage
pnpm --filter @liexp/io test:coverage
pnpm --filter @liexp/backend test:coverage
pnpm --filter agent test:coverage
pnpm --filter admin test:coverage
pnpm --filter web test:coverage

Related

• PR chore(workspace): add test:coverage scripts and vitest coverage thresholds #3334 — adds test:coverage scripts and enforces thresholds in CI