docs: promote universal one-liner installer as primary setup method in README\n\n- Add conductor-init.sh one-liner as Option 1 in 60-Second Setup\n- Clarify prerequisites and security best practices\n- Retain and renumber existing setup options\n- Mention universal installer in How It Works section\n- Improve onboarding for existing repos without cloning\n\nCloses #init-oneliner-docs · ryanmac/code-conductor@3913873

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