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PR trees are attacker-controlled and run through `claude` on a self-hosted runner with clean: false. A PR carrying .claude/settings.json (SessionStart hooks) or .mcp.json (MCP servers) would execute arbitrary commands as the runner user. Remove those files after checkout (after rebase in pr-fix to avoid dirtying the tree) and load the fullstack.md persona from the trusted origin/dev blob instead of the PR tree to prevent system-prompt injection.
fix(ci): strip attacker-controlled Claude/MCP config in PR workflows
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