Add native_extension category and perl cpanm package manager

[andrew]

Adds a native_extension category with four detectors so consumers can tell when a project ships compiled code without re-implementing the marker checks:

• ruby/mkmf.toml: extconf.rb at root or under ext/
• python/cext.toml: setup.py/pyproject.toml declaring Extension(/ext_modules, or .pyx files
• php/phpize.toml: config.m4 containing PHP_ARG_/PHP_NEW_EXTENSION (gated on php/c/cpp since a PECL repo is C source with no .php files)
• node/node-gyp.toml: binding.gyp or node-gyp/node-addon-api/nan/bindings deps

Also adds perl/cpanm.toml so Perl repos get a package_managers entry; previously only Languages carried Perl.

native_extension added to CategoryOrder/CategoryLabels, one CONTRIBUTING row, README section regenerated. TestPerlProject and TestNativeExtensionProject cover the new detections plus a no-false-positive check against the plain ruby fixture.

Taxonomy role is build-tool for now; happy to switch once a native-extension role lands in oss-taxonomy. The *.gemspec .extensions content check isn't included since [detect.file_contains] doesn't glob; extconf.rb presence covers the same repos.

[Copilot]

Pull request overview

Adds a new native_extension tool category to help consumers identify repositories that ship compiled/native code, and introduces a Perl cpanm package manager detector so Perl ecosystems appear under package_managers as well as languages.

Changes:

• Added native_extension category and detectors for Ruby (mkmf), Python (setuptools Extension), PHP (phpize), and Node (node-gyp).
• Added Perl cpanm tool definition so Perl repos can be discovered via package_managers.
• Updated reporting/display metadata (category order/labels) and added fixtures/tests to cover the new detections.

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
testdata/perl-project/script.pl	Adds a minimal Perl source fixture for language detection.
testdata/perl-project/cpanfile	Adds a Perl dependency manifest fixture to trigger cpanm detection.
testdata/native-ext-project/setup.py	Python fixture declaring a native extension via Extension(...).
testdata/native-ext-project/package.json	Node fixture to establish the node ecosystem.
testdata/native-ext-project/Gemfile	Ruby fixture to establish the ruby ecosystem.
testdata/native-ext-project/foo.c	C fixture to establish the c ecosystem (for PECL-style repos).
testdata/native-ext-project/ext/foo/extconf.rb	Ruby native extension marker for mkmf detection.
testdata/native-ext-project/config.m4	PHP extension marker for phpize detection via macro content checks.
testdata/native-ext-project/binding.gyp	Node native addon marker for node-gyp detection.
report/report.go	Adds native_extension to display ordering and human-readable labels.
README.md	Regenerates the “What it detects” section to include the new category/tools and cpanm.
knowledge/ruby/mkmf.toml	Adds mkmf native-extension tool definition.
knowledge/python/cext.toml	Adds setuptools Extension native-extension tool definition.
knowledge/php/phpize.toml	Adds phpize native-extension tool definition gated by PHP macro content checks.
knowledge/perl/cpanm.toml	Adds cpanm package manager tool definition for Perl.
knowledge/node/node-gyp.toml	Adds node-gyp native-extension tool definition.
detect/detect_test.go	Adds tests covering Perl cpanm and the new native_extension detectors.
CONTRIBUTING.md	Documents the new native_extension category.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.