feat(signals): classify build and CI configuration files in path-matchers (#561)

[jason020818]

Add isConfigFile() to distinguish build, lint, test-runner, and environment config files from source code and non-substantive padding. Expand ChangedFileCategory with a "config" bucket and wire it into classifyChangedFile after dependency manifests so config-only diffs are no longer lumped with source effort.

Recognised patterns: exact basenames (Dockerfile, Makefile, .editorconfig …), known prefixes (tsconfig, vitest.config, .env, .eslint …), the generic .config.ext / .rc.ext form, and dot-prefixed bare-rc files (.stylelintrc, .huskyrc). Lockfiles and dependency manifests still rank above config in the classifier, preserving the existing priority order.

Relates to the #561 slop-classification family of matchers.

[ghost]

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🛠️ Maintainer review — Held for maintainer review

Reviewed 2 changed file(s) — two independent AI reviewers, synthesized. ✅ Safe to merge — both reviewers found no blocking issues.

ℹ️ Correct and all CI green — held for maintainer review.

Merge readiness: ✅ Mergeable · all CI checks green/neutral/skipped.

Summary

The change adds comprehensive detection for build and CI configuration files, updates the file classification logic, and expands the ChangedFileCategory enum. All new functions are pure, deterministic, and have thorough unit tests covering typical and edge cases. TypeScript passes, CI is green, and no security concerns are introduced.

💡 Nits — non-blocking, optional

• Consider adding documentation for the new config detection logic in the module header.
• If other parts of the codebase switch on ChangedFileCategory, ensure they handle the new "config" case or have a default fallback.
• Consider adding a comment explaining the rationale behind the specific config file names and prefixes chosen.
• Consider adding a test case for edge cases, such as empty strings or paths with unusual characters.

[ghost]

Tip

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✅ Gittensory review — safe to merge

2 files · 2 AI reviewers · no blockers · readiness 93/100 · CI green · clean

✅ Approved — safe to merge

Review summary
The change introduces a new `isConfigFile` matcher and a corresponding "config" category in `ChangedFileCategory`. The implementation normalizes paths, checks exact basenames, known prefixes, generic `.config.ext` / `.rc.ext` patterns, and bare `.rc` suffixes. Tests cover positive and negative cases, and the classification order respects existing precedence (vendored > lockfile > dependency manifest > config). All existing CI checks pass, indicating no type errors or broken imports. The logic appears sound, handling null/undefined inputs gracefully via `normalize`. The only notable consideration is that other parts of the codebase that switch on `ChangedFileCategory` may now need to handle the new "config" value, but this does not affect current tests.

Suggestions

• Add a unit test for edge cases like a filename ending with "rc" but not a config (e.g., "myrc") to confirm it is not falsely classified.
• Document in the module header that the new "config" category is introduced and that downstream consumers should consider updating any exhaustive switches or weight mappings.
• Consider adding a small comment explaining why the regex `/^\.[^.]+rc$/i` is used (to match dot‑prefixed rc files without an extension).
• In `src/signals/path-matchers.ts`, consider adding a comment to explain the regex patterns used in `isConfigFile` for better maintainability.
• In `test/unit/path-matchers.test.ts`, add tests for edge cases such as empty strings, paths with special characters, and mixed-case filenames to ensure robustness.

Risks

• Any existing code that performs exhaustive pattern matching on `ChangedFileCategory` (e.g., switch statements without a default) may now encounter an unhandled "config" case, potentially leading to runtime errors or incorrect weighting in slop signals.
• If other modules rely on the ordering of categories for priority, the insertion of "config" after dependency manifests could subtly change behavior; review any priority tables or scoring logic.
• The new `isConfigFile` function relies on regex patterns and string matching, which could potentially miss edge cases or false positives. Thorough testing is crucial to ensure accuracy.
• The addition of a new category in `ChangedFileCategory` could affect existing logic that relies on the previous categories. Ensure all relevant parts of the codebase are updated accordingly.

Signal	Result	Evidence
Code review	✅ No blockers	2 reviewers, synthesized
Linked issue	⚠️ Missing	No linked issue or no-issue rationale found.
Related work	✅ No active overlap found	No same-issue or scoped active PR overlap found.
Review load	✅ 20/20	Readiness component derived from cached public PR metadata and labels; size label size:M.
Validation evidence	✅ 25/25	PR body includes validation/test evidence.
Open PR queue	✅ 10/10	0 open PR(s), 0 likely reviewable.
Contributor context	✅ Confirmed Gittensor contributor	jaso0n0818; Gittensor profile; 1360 PR(s), 5 issue(s).
Gate result	✅ Passing	No configured blocker found.

Nits — 1 non-blocking

• No linked issue detected — If this PR is intended to solve an issue, link it explicitly in the PR body.

Review context

• Author: jaso0n0818
• Role context: outside_contributor
• Public audience mode: oss maintainer
• Lane context: Repository is configured for direct PR review.
• Public profile languages: Python, Rust, Shell, C++, Dart, Ruby, Scala, TypeScript
• Official Gittensor activity: 1360 PR(s), 5 issue(s).
• PR-specific overlap: none found.

Contributor next steps

• Explain no-issue PR.
• Link the issue being solved, or explicitly explain why this is a no-issue PR.

Signal definitions

• Related work = same linked issue, overlapping active PRs, or title/path similarity.
• Review load = cached public PR metadata such as size labels, changed paths, and preflight status.
• Open PR queue = repo-wide review pressure; it is not a PR quality failure.
• Contributor context = public GitHub/Gittensor identity context; non-Gittensor status is not a blocker.

Review details

Generated from public PR metadata and the diff. Advisory only; deterministic signals remain authoritative.

The change introduces a new `isConfigFile` matcher and a corresponding "config" category in `ChangedFileCategory`. The implementation normalizes paths, checks exact basenames, known prefixes, generic `.config.ext` / `.rc.ext` patterns, and bare `.rc` suffixes. Tests cover positive and negative cases, and the classification order respects existing precedence (vendored > lockfile > dependency manifest > config). All existing CI checks pass, indicating no type errors or broken imports. The logic appears sound, handling null/undefined inputs gracefully via `normalize`. The only notable consideration is that other parts of the codebase that switch on `ChangedFileCategory` may now need to handle the new "config" value, but this does not affect current tests.

Suggestions

• Add a unit test for edge cases like a filename ending with "rc" but not a config (e.g., "myrc") to confirm it is not falsely classified.
• Document in the module header that the new "config" category is introduced and that downstream consumers should consider updating any exhaustive switches or weight mappings.
• Consider adding a small comment explaining why the regex `/^\.[^.]+rc$/i` is used (to match dot‑prefixed rc files without an extension).
• In `src/signals/path-matchers.ts`, consider adding a comment to explain the regex patterns used in `isConfigFile` for better maintainability.
• In `test/unit/path-matchers.test.ts`, add tests for edge cases such as empty strings, paths with special characters, and mixed-case filenames to ensure robustness.

Risks

• Any existing code that performs exhaustive pattern matching on `ChangedFileCategory` (e.g., switch statements without a default) may now encounter an unhandled "config" case, potentially leading to runtime errors or incorrect weighting in slop signals.
• If other modules rely on the ordering of categories for priority, the insertion of "config" after dependency manifests could subtly change behavior; review any priority tables or scoring logic.
• The new `isConfigFile` function relies on regex patterns and string matching, which could potentially miss edge cases or false positives. Thorough testing is crucial to ensure accuracy.
• The addition of a new category in `ChangedFileCategory` could affect existing logic that relies on the previous categories. Ensure all relevant parts of the codebase are updated accordingly.

_{🟩 Safe / merged · 🟦 Advisory · 🟨 Held for review · 🟥 Blocked / closed}

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Checked by Gittensory, a quiet PR intelligence layer for OSS maintainers.

• Re-run Gittensory review

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.28%. Comparing base (d7f4ccf) to head (85e5f33).
⚠️ Report is 24 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1045   +/-   ##
=======================================
  Coverage   95.28%   95.28%           
=======================================
  Files         149      149           
  Lines       18053    18061    +8     
  Branches     6535     6539    +4     
=======================================
+ Hits        17202    17210    +8     
  Misses        363      363           
  Partials      488      488           

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[ghost]

Held for maintainer (guardrail_area) — correct + CI green

[ghost]

Gittensory approves — the gate is satisfied and CI is green.