Temporarily ignore context engineering notebooks in CI

The notebooks require complex dependency installation and Redis setup
that needs more work to run reliably in CI environment. Adding to
ignore list temporarily while we work on making them CI-friendly.

Author: abrookins

.github/ignore-notebooks.txt

@@ -7,4 +7,8 @@
 02_semantic_cache_optimization
 spring_ai_redis_rag.ipynb
 00_litellm_proxy_redis.ipynb
-04_redisvl_benchmarking_basics.ipynb
+04_redisvl_benchmarking_basics.ipynb
+# Context engineering notebooks - temporarily ignored due to complex dependencies
+01_what_is_context_engineering.ipynb
+02_role_of_context_engine.ipynb
+03_project_overview.ipynb