feat: Add langchain, langraph, and openclaw framework integrations

Add optional dependencies for langchain, langraph, and openclaw to support
multiple framework integrations. These are optional to maintain flexibility
for users to use their preferred framework ecosystem.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

Author: Socratic Developer

pyproject.toml

@@ -33,6 +33,12 @@ requires-python = ">=3.9"
 dependencies = []
 
 [project.optional-dependencies]
+# Framework integrations
+openclaw = []
+langchain = ["langchain>=0.1.0"]
+langraph = ["langgraph>=0.0.1"]
+
+# Development
 dev = [
     "pytest>=7.0",
     "pytest-asyncio>=0.21.0",