add interactive setup wizard for Echo Core onboarding
10-step bash wizard (setup.sh) that guides through: prerequisites check, venv setup, bot identity, Discord/Telegram/WhatsApp bridge configuration, config.json merge, systemd service installation, and health checks. Idempotent — safe to re-run, preserves existing config and secrets. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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