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* CLI: add gateway password-file option * Docs: document safer gateway password input * Update src/cli/gateway-cli/run.ts Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com> * Tests: clean up gateway password temp dirs * CLI: restore gateway password warning flow * Security: harden secret file reads --------- Co-authored-by: greptile-apps[bot] <165735046+greptile-apps[bot]@users.noreply.github.com>