fix: add bilhon/ (without dot) to .gitignore

Prevents bilhon/ directory from being picked up by git add -A
during Layer 2/3 temporary commits. The .bilhon/ (with dot)
was already gitignored but bilhon/ was not.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: thiagofinch

.gitignore

@@ -1,5 +1,6 @@
 # === EXTERNAL FRAMEWORKS (NEVER track) ===
 .aios-core/
+bilhon/
 
 # === ENVIRONMENT & SECRETS ===
 .env