[repo-assist] feat: add Ruby language support

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Summary

Adds cognitive complexity analysis for Ruby source code, bringing the supported language count to 10 (C#, Go, Java, JavaScript, TypeScript, JSX, TSX, Python, Rust, Ruby).

Changes

• New: src/metricsAnalyzer/languages/rubyAnalyzer.ts — RubyMetricsAnalyzer class using tree-sitter-ruby
• New: samples/Test.rb — sample Ruby file demonstrating complexity analysis
• New: src/test/metricsAnalyzer/languages/rubyAnalyzer.test.ts — VS Code integration tests
• Updated: src/metricsAnalyzer/metricsAnalyzerFactory.ts — registers ruby language
• Updated: src/test/suite/index.ts — registers Ruby analyzer tests in the test suite
• Updated: src/unit/unit.test.ts — 9 new Ruby unit tests + updated stale test references
• Updated: package.json — adds onLanguage:ruby activation event and tree-sitter-ruby dependency

Cognitive Complexity Rules Implemented

Construct	Increment
if, if_modifier	+1 + nesting
unless, unless_modifier	+1 + nesting
while, while_modifier	+1 + nesting
until, until_modifier	+1 + nesting
for	+1 + nesting
case	+1 + nesting
elsif, else, when, rescue	+1 (flat)
? : ternary	+1
&&, ||, and, or	+1 each
nested block/lambda	+1 + nesting (when nesting > 0)

Method Naming

• Instance methods: ClassName#method_name
• Class methods (singleton): ClassName.method_name
• Module methods: ModuleName.method_name
• Top-level methods: method_name

Test Status

• npm run compile — ✅ passes
• npm run lint — ✅ passes
• Unit tests (112 total) — ✅ all pass
• VS Code integration tests — ⚠️ requires VS Code download (expected in CI sandboxes)

Note: tree-sitter-ruby@^0.23.1 has peer dep tree-sitter: ^0.21.1, compatible with the current tree-sitter@0.21.1.

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Protected Files — Push Permission Denied

This was originally intended as a pull request, but the patch modifies protected files. A human must create the pull request manually.

Protected files

• package-lock.json

• package.json

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Create the pull request manually

# Download the patch from the workflow run
gh run download 26739249308 -n agent -D /tmp/agent-26739249308

# Create a new branch
git checkout -b repo-assist/feat-ruby-support-20260601-0161c15ee6c00dd5 main

# Apply the patch (--3way handles cross-repo patches)
git am --3way /tmp/agent-26739249308/aw-repo-assist-feat-ruby-support-20260601.patch

# Push the branch and create the pull request
git push origin repo-assist/feat-ruby-support-20260601-0161c15ee6c00dd5
gh pr create --title '[repo-assist] feat: add Ruby language support' --base main --head repo-assist/feat-ruby-support-20260601-0161c15ee6c00dd5 --repo askpt/code-metrics

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