Add vitest coverage reporting with 70 percent line coverage threshold

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Description

Configure vitest coverage with v8 provider. Add npm run test:coverage script. Set lines: 70 threshold — CI fails if coverage drops below. Add coverage badge to README. Store reports in coverage/ which is gitignored.

Acceptance Criteria

• Add vitest coverage reporting with 70 percent line coverage threshold

Milestone Context

Milestone	v6 — Local Testing & Simulation Framework
Phase	Phase 50: CI Integration & Coverage
GSD Route	quick
Phase Position	Phase 4 of 4 in milestone

Milestone Goal

Offline test suite with mock GitHub API and fake GSD agents to validate MGW orchestration logic without requiring live GitHub tokens or active Claude API calls.

Phase Goal

Wire the test suite into CI, enforce coverage thresholds, and add a local test helper so contributors can run the full suite in one step.

Dependencies

add-github-actions-test-workflow-running-on-ever

Scope Hints

• Estimated route: quick
• Labels: testing,ci

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MGW · work-started · 2026-03-06T11:00:53Z
Milestone: v6 — Local Testing & Simulation Framework | Phase 50: CI Integration & Coverage

Work Started

Issue	#257 — Add vitest coverage reporting with 70 percent line coverage threshold
Route	plan-phase
Phase	50 — CI Integration & Coverage
Position	11 of 11 (final issue)

Pipeline executing autonomously...

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MGW · work-starting · 2026-03-06T11:04:06Z
Milestone: v6 — Local Testing & Simulation Framework | Phase 50: CI Integration & Coverage

Work Starting

Route	quick — Config-only changes to vitest, package.json, gitignore, README
Scope	small — 5 files across vitest.config.js, package.json, .gitignore, README.md, .github/workflows/
Conflicts	None

Work begins on branch issue/257-add-vitest-coverage-reporting-with-70-pe.

Affected Files

• vitest.config.js
• package.json
• .gitignore
• README.md
• .github/workflows/test.yml (optional coverage upload)

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MGW · pr-ready · 2026-03-06T11:09:56Z
Milestone: v6 — Local Testing & Simulation Framework | Phase 50: CI Integration & Coverage

PR Ready

PR #268 — #268

Added vitest coverage with v8 provider, 70% line threshold enforcement, and lcov/html/text output to power CI gates and badge tracking.

Testing procedures posted on the PR.
This issue will auto-close when the PR is merged.

Pipeline Summary

Stage	Status
Triage	✓
Planning	✓
Execution	✓
PR Creation	✓