Implement tech stack detection from GitHub repos

[bishopBethel]

Analyze user's top 20 repos (by stars/activity), parse language breakdowns and dependency files (package.json, requirements.txt, Cargo.toml, etc), produce weighted tech_stack array.

[bishopBethel]

/bounty $17 3 days

[devasign-app]

💵 17.00 USDC Bounty

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