Add Node Rust native extension detectors

[andrew]

Adds napi-rs and Neon native-extension definitions for Node projects. Detection covers their scoped npm CLI packages, Cargo.toml configuration, and napi-rs build scripts, with fixtures for positive signals and near misses.

[Copilot]

Pull request overview

Adds new Node “native_extension” tool definitions for Rust-based addons (napi-rs and Neon) to the knowledge base, along with test fixtures and detector tests to ensure these projects are classified with high confidence.

Changes:

• Added KB definitions for napi-rs and Neon (detection signals + suggested commands + taxonomy).
• Added testdata/ fixtures for representative Neon and napi-rs projects.
• Extended detector tests to validate positive signals and a “near miss” scenario.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
testdata/neon-project/src/lib.rs	Adds minimal Rust source fixture for Neon project detection.
testdata/neon-project/package.json	Adds Neon fixture package.json including @neon-rs/cli and build scripts.
testdata/neon-project/Cargo.toml	Adds Neon fixture Cargo.toml with cdylib + neon dependency.
testdata/napi-rs-project/src/lib.rs	Adds minimal Rust source fixture for napi-rs project detection.
testdata/napi-rs-project/package.json	Adds napi-rs fixture package.json including @napi-rs/cli and build script.
testdata/napi-rs-project/Cargo.toml	Adds napi-rs fixture Cargo.toml with cdylib + napi crates/build dependency.
knowledge/node/neon.toml	Introduces Neon detector definition and metadata under native_extension.
knowledge/node/napi-rs.toml	Introduces napi-rs detector definition and metadata under native_extension.
detect/detect_test.go	Adds tests validating both project fixtures and individual detection signals/near-misses.

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