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

.claude-plugin/marketplace.json

@@ -7,7 +7,7 @@
   },
   "metadata": {
     "description": "Production-ready workflow orchestration with 67 focused plugins, 99 specialized agents, and 107 skills - optimized for granular installation and minimal token usage",
-    "version": "1.3.2"
+    "version": "1.3.3"
   },
   "plugins": [
     {
@@ -341,8 +341,8 @@
     {
       "name": "llm-application-dev",
       "source": "./plugins/llm-application-dev",
-      "description": "LLM application development, prompt engineering, and AI assistant optimization",
-      "version": "1.2.2",
+      "description": "LLM application development with LangGraph, RAG systems, vector search, and AI agent architectures for Claude 4.5 and GPT-5.2",
+      "version": "2.0.0",
       "author": {
         "name": "Seth Hobson",
         "url": "https://github.com/wshobson"
@@ -355,6 +355,10 @@
         "ai",
         "prompt-engineering",
         "langchain",
+        "langgraph",
+        "rag",
+        "vector-search",
+        "voyage-ai",
         "gpt",
         "claude"
       ],