Fix CI numpy pin: drop <2.0.0 upper bound

langchain-community==0.3.31 requires numpy>=2.1.0 when Python is 3.13 (our target). The `numpy<2.0.0` pin made this unresolvable on CI. Locally this was masked because an installed numpy 2.4.2 pre-existed outside the resolver.

Verified chromadb 1.5.0 works with numpy 2.4.2 locally. Removing the upper bound lets pip pick numpy 2.x on Python 3.13 while still allowing 1.x where 2.x isn't needed.

Author: roampal-ai

ui-implementation/src-tauri/backend/requirements.txt

@@ -15,7 +15,7 @@ aiohttp>=3.9.0         # Async HTTP for embedding_client
 chromadb>=1.0.0,<2.0.0  # v0.2.10: Aligned with roampal-core, auto-persists deletes
 
 # Scientific computing (pinned for compatibility)
-numpy>=1.22.5,<2.0.0
+numpy>=1.22.5
 scipy>=1.11.4,<2.0.0
 pandas>=1.5.3,<3.0.0