Add Claude Code GitHub Action (@claude mentions)

[OneBigHen]

Adds a workflow that responds when @claude is mentioned in a PR/issue comment or review. Uses the already-set CLAUDE_CODE_OAUTH_TOKEN repo secret. Targets feat/single-user-ai-studio (the real active branch), not main.

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[OneBigHen]

Duplicate of #2 (same branch, same workflow file) -- closing to avoid confusion. Reconciliation job will re-check before opening future duplicates.