Add TestGen cost, comparison, and 10-language support

[princepal9120]

Summary

• Add testgen cost for direct offline generation cost estimates
• Add testgen comparison plus compare/vs aliases for plain LLM vs TestGen skill reports
• Add testcase, testcases, and tests aliases for testgen generate
• Expand TestGen support from 5 to 10 language families: JavaScript/TypeScript, Python, Go, Rust, Java, C#, PHP, Ruby, C++, and Kotlin
• Add adapters, scanner detection, examples, tests, README, website, and skill updates
• Populate provider/model/request/token fields in analyze cost responses

Validation

• go test ./...
• go build -o ./bin/testgen .
• ./bin/testgen cost --path=./examples --output-format=json
• ./bin/testgen cost --path=./examples/python --provider=gemini --output-format=json
• ./bin/testgen comparison --path=./examples/python --provider=gemini
• ./bin/testgen testcase --help

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Project	Deployment	Actions	Updated (UTC)
testgen-cli	Ready	Preview, Comment	Apr 30, 2026 10:07am