ci: add path-based filtering to skip irrelevant workflows on PRs

[KRRT7]

Summary

• JS E2E workflows only trigger when JS-relevant files change (codeflash/languages/javascript/, packages/, code_to_optimize/js/, JS test files)
• Python E2E workflows skip when only JS/npm files change (via ! negation patterns)
• Python unit test and linter workflows (unit-tests, windows-unit-tests, mypy, prek) get path filters scoped to Python-relevant files
• Unit test workflows intentionally keep code_to_optimize/js/** included since test_multi_file_code_replacer.py depends on JS fixtures
• push: branches: [main] and workflow_dispatch remain unfiltered

Test plan

• Open a PR touching only Python files → JS E2E workflows should not trigger
• Open a PR touching only packages/ → Python E2E/unit tests should not trigger
• Pushes to main still trigger everything (no path filter on push)
• workflow_dispatch still works for all workflows

[claude]

PR Review Summary

Prek Checks

✅ Passed — No Python files changed in this PR; prek and mypy have nothing to check.

Code Review

✅ No critical issues found.

This PR adds path-based filtering to 16 GitHub Actions workflow files. The changes are well-structured:

• Python E2E workflows (8 files): Trigger on codeflash/, code_to_optimize/ (excluding JS), tests/, pyproject.toml, uv.lock, and related workflow files
• JS E2E workflows (3 files): Trigger only on codeflash/languages/javascript/, packages/, code_to_optimize/js/, JS test files, and JS workflow files
• Quality workflows (mypy, prek): Scoped to Python-relevant files with self-referencing workflow paths
• Unit test workflows (2 files): Intentionally include code_to_optimize/js/ since test_multi_file_code_replacer.py depends on JS fixtures
• Push to main and workflow_dispatch remain unfiltered — correct behavior
• Each workflow file includes its own path for self-triggering (added in the third commit)

Test Coverage

⏭️ Skipped — No Python source files changed in this PR. All changes are to .github/workflows/*.yaml files, so coverage analysis is not applicable.

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Last updated: 2026-02-19

[KRRT7]

actually I'll think of a better way to do this