docs: Fix misleading references to non-existent community packages

- Clearly marked community augmentations as 'Coming Soon!' and ideas
- Changed examples to show they are future possibilities, not current packages
- Fixed cortex.register() references to use brain.register() consistently
- Updated augmentation interface from ISenseAugmentation to IAugmentation
- Added proper brain.register() example in augmentation creation section
- Added note that community packages are examples of what could be built
- Added 'Be the First!' encouragement for community builders

This ensures documentation is honest about what exists vs what's possible.

UNIFIED-API.md

@@ -185,9 +185,10 @@ Extend Brainy with custom capabilities.
 import { NeuralImport } from '@soulcraft/brainy'
 brain.register(new NeuralImport())
 
-// Register community augmentations
-import SentimentAnalyzer from 'brainy-sentiment'
-brain.register(new SentimentAnalyzer())
+// Register community augmentations (when available)
+// Example: Future community packages
+// import SentimentAnalyzer from 'brainy-sentiment'
+// brain.register(new SentimentAnalyzer())
 
 // Register your own augmentation
 class MyCustomAugmentation {