feat(llm-application-dev): modernize to LangGraph and latest models v2.0.0

- Migrate from LangChain 0.x to LangChain 1.x/LangGraph patterns
- Update model references to Claude 4.5 and GPT-5.2
- Add Voyage AI as primary embedding recommendation
- Add structured outputs with Pydantic
- Replace deprecated initialize_agent() with StateGraph
- Fix security: use AST-based safe math instead of unsafe execution
- Add plugin.json and README.md for consistency
- Bump marketplace version to 1.3.3

plugins/llm-application-dev/commands/prompt-optimize.md

@@ -113,9 +113,9 @@ Final Response: [Refined]
 
 ### 5. Model-Specific Optimization
 
-**GPT-5/GPT-4o**
+**GPT-5.2**
 ```python
-gpt4_optimized = """
+gpt5_optimized = """
 ##CONTEXT##
 {structured_context}
 
@@ -566,7 +566,7 @@ testing_recommendations:
   metrics: ["accuracy", "satisfaction", "cost"]
 
 deployment_strategy:
-  model: "GPT-5 for quality, Claude for safety"
+  model: "GPT-5.2 for quality, Claude 4.5 for safety"
   temperature: 0.7
   max_tokens: 2000
   monitoring: "Track success, latency, feedback"