%% LLM Local-First Ecosystem Architecture - Emphasizing Vector DBs, Repo Indexing, & Tooling (2025-08)
graph TD
  %% === Core Tiers ===
  A[AI Architecture Entry Point]:::entry

  A --> LocalLLM[🧠 Local LLM Stack]:::section
  A --> HostedLLM[☁️ Hosted LLM Stack]:::section

  %% === Local ===
  LocalLLM --> LMStudio[LM Studio]:::tool
  LocalLLM --> Ollama[Ollama]:::tool
  LocalLLM --> GGML[GGML (llama.cpp)]:::tool
  LocalLLM --> vLLM[vLLM (GPU Server)]:::tool
  LocalLLM --> LoRAAdapter[LoRA Adapter Training]:::tool

  %% === Hosted ===
  HostedLLM --> OpenAI[OpenAI (GPT-4, GPT-4o)]:::tool
  HostedLLM --> Claude[Claude 3]:::tool
  HostedLLM --> Gemini[Gemini 1.5]:::tool
  HostedLLM --> Groq[Groq Inference]:::tool
  HostedLLM --> Together[Together.ai / Fireworks.ai]:::tool

  %% === Vector DB Layer ===
  A --> VectorLayer[📦 Vector Index Layer]:::section

  VectorLayer --> LanceDB[LanceDB]:::tool
  VectorLayer --> Chroma[Chroma]:::tool
  VectorLayer --> Weaviate[Weaviate]:::tool
  VectorLayer --> Qdrant[Qdrant]:::tool
  VectorLayer --> FAISS[FAISS (GPU/CPU)]:::tool

  %% === Indexing ===
  A --> AutoIndexer[📚 Auto Indexers]:::section
  AutoIndexer --> Watchman[File Watcher]:::tool
  AutoIndexer --> RepoScan[Repo Scanner]:::tool
  AutoIndexer --> Embedding[Embedder (Gemma, BGE, MiniLM)]:::tool
  AutoIndexer --> RAGSync[RAG Metadata Sync]:::tool

  %% === Embedding Pipelines ===
  Embedding --> LocalEmb[Local Embedding (GGML/TFLite)]:::tech
  Embedding --> HuggingFace[HuggingFace Embedding APIs]:::tech
  Embedding --> OpenAIEmb[OpenAI Embeddings]:::tech

  %% === LLM ↔ VectorDB Interaction ===
  LocalLLM --> RAG[RAG-Powered Local QA]:::flow
  VectorLayer --> RAG
  RAG --> Output[Answer Generation with Context]:::output

  %% === Developer Workflow Use Cases ===
  A --> UseCases[🧰 Use Cases]:::section
  UseCases --> AgentCodeSearch[AI Code Agent Search]:::usecase
  UseCases --> AutoPR[Auto PR Summarization]:::usecase
  UseCases --> AgentCopilot[Dev Copilot (offline)]:::usecase
  UseCases --> LocalChat[Project-Aware Local Chatbot]:::usecase
  UseCases --> CommitInsight[LLM Commit Insight]:::usecase

  %% === Integrators ===
  A --> Toolchains[🧵 Toolchain Layer]:::section
  Toolchains --> LangChain[LangChain]:::tool
  Toolchains --> LlamaIndex[LlamaIndex]:::tool
  Toolchains --> SemanticKernel[Semantic Kernel]:::tool
  Toolchains --> Autogen[AutoGen]:::tool

  %% Styling
  classDef entry fill:#fff,stroke:#000,stroke-width:2px;
  classDef section fill:#eef,stroke:#88a,stroke-width:2px;
  classDef tool fill:#ccf,stroke:#55a,stroke-width:1px;
  classDef tech fill:#cfc,stroke:#3a3,stroke-width:1px;
  classDef flow fill:#ffe,stroke:#aa0,stroke-width:1px;
  classDef usecase fill:#fcf,stroke:#a3a,stroke-width:1px;
  classDef output fill:#efe,stroke:#3a3,stroke-width:1px;