Replace the README with the marketing-reviewed version and bring the
project onto one consistent naming scheme:
- "Shannon Lite" -> "Shannon" (the open-source CLI is just Shannon)
- "Shannon Pro" -> "Keygraph" (the commercial platform)
- Rename docs/shannon-pro.md -> docs/keygraph-platform.md and fix the
internal link, matching the README's link target.
- Regenerate llms.txt and llms-full.txt from the updated README and docs.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
george-keygraph