[repo-assist] feat: add C++ cognitive complexity analyzer

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Summary

Adds cognitive complexity analysis for C++ source files, bringing the extension's language coverage to 10 languages (C#, Go, Java, JS, TS, Python, Rust, TSX, JSX, and now C++).

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What's New

src/metricsAnalyzer/languages/cppAnalyzer.ts (new)

CppMetricsAnalyzer uses tree-sitter-cpp@0.23.4 to parse C++ and calculates cognitive complexity for all function_definition nodes (free functions, class methods, constructors, destructors, and operator overloads).

Supported complexity constructs:

Construct	Increment
if, while, for, for-range, do-while, switch	+1 + nesting
try block	+1 + nesting
catch clause	+1 + nesting
&& / || (per distinct chain)	+1 flat
Ternary ?:	+1 flat
Lambda expression (when nested)	+1 + nesting
break / continue (inside nesting)	+1 flat
goto	+1 flat

• Qualified naming: methods and operators inside classes are reported as ClassName::methodName or ClassName::operator==
• Out-of-line definitions (Foo::bar() defined outside the class) use the fully-qualified name from the declarator
• Lambdas are collected as separate analysis entries; a top-level lambda (not inside any nesting construct) does not add to the enclosing function's score

src/metricsAnalyzer/metricsAnalyzerFactory.ts

Registers cpp as a supported language ID.

package.json

• Adds tree-sitter-cpp@0.23.4 as a runtime dependency (compatible with the existing tree-sitter@0.21.1 peer constraint)
• Adds onLanguage:cpp activation event
• Adds cpp and c++ to keywords

samples/Test.cpp

Sample C++ file with annotated complexity scores for manual extension testing.

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Dependency note

tree-sitter-cpp@0.23.4 declares peerDependencies: { "tree-sitter": "^0.21.1" } which matches the current pinned tree-sitter@0.21.1, so no version bump is required.

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Test Status

npm run compile  ✅  (0 errors)
npm run lint     ✅  (0 warnings)
npm run test:unit  ✅  225 passing (was 201), 0 failing

Coverage (analyzer/factory code, VS Code-API files excluded):

• All coverage thresholds met (no threshold violations)
• cppAnalyzer.ts: 94.87% stmts, 87.5% branches, 100% functions

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Warning

Protected Files — Push Permission Denied

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Protected files

• package.json

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Create the pull request manually

# Download the patch from the workflow run
gh run download 30913641687 -n agent -D /tmp/agent-30913641687

# Create a new branch
git checkout -b repo-assist/feat-cpp-support-20260804-ac6a6b61a5392712 main

# Apply the patch (--3way handles cross-repo patches)
git am --3way /tmp/agent-30913641687/aw-repo-assist-feat-cpp-support-20260804.patch

# Push the branch and create the pull request
git push origin repo-assist/feat-cpp-support-20260804-ac6a6b61a5392712
gh pr create --title '[repo-assist] feat: add C++ cognitive complexity analyzer' --base main --head repo-assist/feat-cpp-support-20260804-ac6a6b61a5392712 --repo askpt/code-metrics

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