Made the setup and installation output more concise and reassuring for users. Less verbosity, clearer messaging.
**Setup script improvements:**
- Changed "Container Detection" → "Enhanced Security"
- Simplified prompts: "Enable secure proxy? [Y/n]"
- Cleaned up success messages: "✓ Secure proxy architecture enabled"
- Removed verbose status messages (node-by-node cleanup output)
- Only show essential information users need to see
**install-sensor-proxy.sh improvements:**
- Added --quiet flag to suppress verbose output
- In quiet mode, only shows: "✓ pulse-sensor-proxy installed and running"
- Full output still available when run manually
- Removed redundant "Installation complete!" banners
- Cleaner legacy key cleanup messaging
**Result:**
Users see a clean, professional installation flow that builds confidence. Technical details are hidden unless needed. Messages are clear and reassuring rather than verbose.
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