Remove LangChain observability extension and its dependencies

CLAUDE.md

@@ -124,7 +124,6 @@ libraries/
 └── Framework Extensions (integrate with specific AI frameworks)
     ├── Observability Extensions
     │   ├── *-observability-extensions-openai
-    │   ├── *-observability-extensions-langchain
     │   ├── *-observability-extensions-semantickernel
     │   └── *-observability-extensions-agentframework
     │

DEPENDENCIES.md

@@ -7,7 +7,6 @@ graph LR
     %% Package Nodes
     microsoft_agents_a365_notifications["microsoft-agents-a365-notifications"]
     microsoft_agents_a365_observability_core["microsoft-agents-a365-observability-core"]
-    microsoft_agents_a365_observability_extensions_langchain["microsoft-agents-a365-observability-extensions-langchain"]
     microsoft_agents_a365_observability_extensions_openai["microsoft-agents-a365-observability-extensions-openai"]
     microsoft_agents_a365_observability_extensions_semantic_kernel["microsoft-agents-a365-observability-extensions-semantic-kernel"]
     microsoft_agents_a365_observability_extensions_agent_framework["microsoft-agents-a365-observability-extensions-agent-framework"]
@@ -20,7 +19,6 @@ graph LR
 
     %% Dependencies
     microsoft_agents_a365_observability_core --> microsoft_agents_a365_runtime
-    microsoft_agents_a365_observability_extensions_langchain --> microsoft_agents_a365_observability_core
     microsoft_agents_a365_observability_extensions_openai --> microsoft_agents_a365_observability_core
     microsoft_agents_a365_observability_extensions_semantic_kernel --> microsoft_agents_a365_observability_core
     microsoft_agents_a365_observability_extensions_agent_framework --> microsoft_agents_a365_observability_core
@@ -37,7 +35,7 @@ graph LR
     classDef observability fill:#c8e6c9,stroke:#2e7d32,color:#142a14,stroke-width:2px
     class microsoft_agents_a365_observability_core observability
     classDef observability_extensions fill:#e8f5e9,stroke:#66bb6a,color:#1f3d1f,stroke-width:2px
-    class microsoft_agents_a365_observability_extensions_langchain,microsoft_agents_a365_observability_extensions_openai,microsoft_agents_a365_observability_extensions_semantic_kernel,microsoft_agents_a365_observability_extensions_agent_framework observability_extensions
+    class microsoft_agents_a365_observability_extensions_openai,microsoft_agents_a365_observability_extensions_semantic_kernel,microsoft_agents_a365_observability_extensions_agent_framework observability_extensions
     classDef tooling fill:#ffe0b2,stroke:#e65100,color:#331a00,stroke-width:2px
     class microsoft_agents_a365_tooling tooling
     classDef tooling_extensions fill:#fff3e0,stroke:#fb8c00,color:#4d2600,stroke-width:2px

README.md

@@ -77,7 +77,6 @@ The best way to consume this SDK is via our PyPI packages found here: [pypi.org]
 - **libraries/microsoft-agents-a365-notifications**: Microsoft Agent 365 Notifications SDK - Agent notification services and models
 - **libraries/microsoft-agents-a365-observability-core**: Microsoft Agent 365 Observability Core - Core observability functionality
 - **libraries/microsoft-agents-a365-observability-extensions-agentframework**: Agent Framework observability extensions
-- **libraries/microsoft-agents-a365-observability-extensions-langchain**: LangChain observability extensions
 - **libraries/microsoft-agents-a365-observability-extensions-openai**: OpenAI observability extensions
 - **libraries/microsoft-agents-a365-observability-extensions-semantickernel**: Semantic Kernel observability extensions
 - **libraries/microsoft-agents-a365-runtime**: Microsoft Agent 365 Runtime - Core runtime utilities and extensions

docs/design.md

@@ -17,11 +17,10 @@ The SDK supports production deployment across Microsoft 365, Teams, Copilot Stud
 
 ```
 Agent365-python/
-├── libraries/                              # Core packages (13 total)
+├── libraries/                              # Core packages (12 total)
 │   ├── microsoft-agents-a365-notifications/
 │   ├── microsoft-agents-a365-observability-core/
 │   ├── microsoft-agents-a365-observability-extensions-agentframework/
-│   ├── microsoft-agents-a365-observability-extensions-langchain/
 │   ├── microsoft-agents-a365-observability-extensions-openai/
 │   ├── microsoft-agents-a365-observability-extensions-semantickernel/
 │   ├── microsoft-agents-a365-observability-hosting/
@@ -129,7 +128,6 @@ Framework-specific instrumentations that integrate with the observability core:
 | Package | Purpose | Design Doc |
 |---------|---------|------------|
 | `extensions-openai` | Instrument OpenAI SDK client calls | [design.md](../libraries/microsoft-agents-a365-observability-extensions-openai/docs/design.md) |
-| `extensions-langchain` | LangChain callback integration | [design.md](../libraries/microsoft-agents-a365-observability-extensions-langchain/docs/design.md) |
 | `extensions-agentframework` | Microsoft Agents SDK integration | [design.md](../libraries/microsoft-agents-a365-observability-extensions-agentframework/docs/design.md) |
 | `extensions-semantickernel` | Semantic Kernel instrumentation | [design.md](../libraries/microsoft-agents-a365-observability-extensions-semantickernel/docs/design.md) |
 | `hosting` | Hosting-specific observability utilities | — |
@@ -461,7 +459,6 @@ tests/
 │   │   └── test_baggage_builder.py             # Context propagation tests
 │   └── extensions/
 │       ├── openai/
-│       ├── langchain/
 │       └── agentframework/
 ├── runtime/
 │   ├── test_power_platform_api_discovery.py

docs/integrating-with-existing-opentelemetry.md

@@ -73,7 +73,6 @@ The OTel **backend** (where spans go) and the **instrumentation style** (how spa
 For auto-instrumentation, install the framework-specific extension package — for example:
 
 - OpenAI Agents SDK → `microsoft-agents-a365-observability-extensions-openai`
-- LangChain → `microsoft-agents-a365-observability-extensions-langchain`
 - Semantic Kernel → `microsoft-agents-a365-observability-extensions-semantickernel`
 - Microsoft Agent Framework → `microsoft-agents-a365-observability-extensions-agentframework`