parser: detect files under __tests__/ as tests

[Pr1ncePS2002]

Summary

Brings parser.py test-file detection in line with flows.py and refactor.py, which already recognize Jest's __tests__/ directory convention. Without this fix, a file like src/__tests__/UserService.ts was treated as a test by criticality scoring and dead-code analysis but never produced Test nodes or TESTED_BY edges.

What changed

• code_review_graph/parser.py: add re.compile(r\"[\\/]__tests__[\\/]\") to _TEST_FILE_PATTERNS (same regex already used in flows.py:141 and refactor.py:203)
• tests/fixtures/__tests__/UserService.ts: new fixture under a __tests__/ directory with no .test. / .spec. marker in the filename — only the directory should trigger detection
• tests/test_parser.py: two regression tests (test_jest_tests_dir_detected_as_test_file, test_jest_tests_dir_produces_test_nodes)

Risk

Minimal. Adding a pattern only adds detection — it cannot make a previously-detected test stop being detected. The regex is already in production use elsewhere in the codebase.

Test plan

• uv run pytest tests/test_parser.py -k jest_tests_dir -v — 2/2 passing
• uv run pytest tests/test_parser.py -k vitest -v — adjacent test detection unchanged (4/4 passing)
• Verified no new failures vs. main baseline (18 pre-existing Windows-only failures present on both)

[Copilot]

Pull request overview

This PR updates the parser’s test-file detection so files located under Jest-style __tests__/ directories are treated as test files, bringing parser.py into line with the existing behavior in flow and refactor analysis. It also adds regression coverage and a fixture intended to verify that such files produce Test nodes and TESTED_BY edges.

Changes:

• Added a __tests__/ path pattern to code_review_graph/parser.py test-file detection.
• Added a new TypeScript fixture located under tests/fixtures/__tests__/.
• Added parser regression tests for direct test-file classification and parser output from __tests__/ files.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
code_review_graph/parser.py	Extends parser-side test-file path matching to recognize Jest __tests__/ directories.
tests/test_parser.py	Adds regression tests for _is_test_file() and for parser output from a file under __tests__/.
tests/fixtures/__tests__/UserService.ts	Adds a Vitest-style fixture used by the new parser regression test.

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