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Self-hosters can now run: ./solitaire_server --reset-password <username> to update a player's password and invalidate all their refresh tokens (forcing re-login on every device). Password is read from stdin so it can be piped from scripts or a password manager without appearing in shell history. Implementation: - reset_password() in auth.rs: validates length, bcrypt-hashes new password, updates users.password_hash, deletes all refresh_tokens rows for the user. - main.rs: --reset-password dispatch before HTTP server startup; JWT_SECRET not required for this path. - 4 integration tests covering: login works after reset, old password rejected, refresh tokens invalidated, unknown user → NotFound, short password → BadRequest. - README_SERVER.md: admin password-reset section with examples. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>