docs: add comprehensive CONFIGURATION.md and examples CLI command

Add consumer-friendly documentation and interactive help:
- CONFIGURATION.md: Complete guide covering nodes, search, FTS indexes
- Examples command: Practical examples for all CLI commands
- Focus on implemented features only (SQLite-based)
- Include configuration change impact warnings

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Co-Authored-By: Amplifier <240397093+microsoft-amplifier@users.noreply.github.com>

Author: dluc