Goal#

Add tests for lib modules with NO test files:

1. lib/benchmark-runner.ts — CLI benchmark execution, model invocation, result collection
2. lib/benchmark-types.ts — type definitions, validation, defaults
3. lib/benchmark-seeds.ts — seed data for benchmark tests
4. lib/benchmark-storage.ts — persistent benchmark storage, read/write results
5. lib/findings-storage.ts — review findings persistence
6. lib/review-parser.ts — parse review output into structured findings
7. lib/commit-author-config.ts — commit author detection/generation

Acceptance#

• Each module has a test file: __tests__/<module>.test.ts
• Coverage >=80% per module
• Tests cover: success paths, error states, edge cases (empty data, malformed input)
• @area annotation: "Core Infrastructure"
• No regression