Add automated test suite and CI workflow

[joshbouncesecurity]

Problem

OpenAnt currently has no automated test suite. Changes to parsers, the LLM client, or the Go CLI wrapper can introduce regressions that are only caught by running full end-to-end scans manually.

Proposal

Add a pytest test suite and GitHub Actions CI workflow covering:

Tests (60 total)

• Token tracker: pricing calculations, cumulative tracking, reset, summaries
• Language detection: Python/JS/mixed repos, correctly ignores venv/node_modules
• Python parser phases: scanner, function extractor, call graph builder, unit generator — each tested individually against a small fixture repo
• JavaScript parser: scanner, TypeScript analyzer, unit generator, full pipeline via parser_adapter
• Go CLI wrapper: version/help commands, parse (Python + JS repos), API key validation — invoking the real compiled binary

CI workflow

• Runs on Linux, macOS, and Windows
• Two jobs: Python/parser tests + Go build/vet/integration tests
• Triggers on push to master and on pull requests

Fixtures

Small sample repos (Python + JavaScript) included as test fixtures — no external dependencies needed.

Known Windows issues discovered

• ts-morph fails to resolve files with backslash paths (marked as xfail)
• Unicode checkmarks (✓/✗) in parsers/javascript/test_pipeline.py crash on Windows cp1252 encoding (marked as xfail)

PR

See: #15