test: improve test coverage to 90%+

[GeiserX]

Summary

• Add @vitest/coverage-v8 and vitest.config.ts for V8 coverage collection
• Add codecov.yml with 90% project/patch targets
• Add dedicated coverage CI job with Codecov upload
• Add comprehensive tests for all previously uncovered modules:
  • ghost.ts: fetchPage, updatePage (was 33% -> 100%)
  • github.ts: fetchPortfolioConfig, detectBanner edge cases, verbose mode (was 71% -> 97%)
  • generator.ts: all renderCustomBadge types, personalNote, keyFeatures, footer variants (was 85% -> 100%)
  • index.ts: CLI sync and init commands with fully mocked dependencies (was 0% -> 100%)
• Final coverage: 99.57% statements, 90.87% branches, 95.65% functions, 99.57% lines
• 96 tests total, all passing

Test plan

• All 96 tests pass locally with npx vitest run
• Coverage report confirms 90%+ across all metrics
• CI pipeline passes (build + test + coverage + docker)
• Codecov upload succeeds (requires CODECOV_TOKEN secret)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro

Run ID: 523f4ef4-1381-4e13-86f8-331715dcf0c3

📥 Commits

Reviewing files that changed from the base of the PR and between 5bd23d4 and ea5163f.

⛔ Files ignored due to path filters (1)

• package-lock.json is excluded by !**/package-lock.json

📒 Files selected for processing (8)

• .github/workflows/ci.yml
• codecov.yml
• package.json
• src/generator.test.ts
• src/ghost.test.ts
• src/github.test.ts
• src/index.test.ts
• vitest.config.ts

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/improve-coverage

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