docs: update CHANGE.md and README.md for upcoming patch release

- CHANGE.md: Added entries for May 18 (token economics, chat export, UI fixes)
  and May 19 (Qdrant semantic search, vector embeddings, model/test fixes)
- README.md: Added Qdrant to prerequisites and architecture diagram,
  documented token economics, semantic search, and chat export features

CHANGE.md

@@ -4,6 +4,37 @@ This document tracks all significant changes to Gadget Code, organized by date.
 
 ---
 
+## 2026-05-19 (Monday)
+
+**Qdrant Semantic Search and Vector Embeddings**
+
+Implemented Qdrant-powered semantic search over chat history with full embedding pipeline, including Qdrant and LangChain configuration, vector dimension passthrough for both Ollama and OpenAI, and a new search API endpoint with frontend search input component. Also fixed Mongoose syncIndexes errors across all models and improved drone-session test isolation.
+
+### Changes:
+- **Semantic Search**: Implemented Qdrant vector search over chat history with embedding pipeline and search API endpoint.
+- **Embeddings**: Added Qdrant and embedding model configuration; added `@langchain/textsplitters` for text vector processing; fixed vector dimension passthrough for Ollama and OpenAI.
+- **Frontend**: Added SearchInput and ChatSearchResults components; integrated search into ChatSessionView.
+- **Models**: Removed `syncIndexes` from all Mongoose models (caused duplicate index errors); mocked DB in drone-session tests.
+- **Fixes**: Fixed auto-scroll, search input errors, and backend error handling; logging and formatting cleanup.
+- **Build**: Added clean script.
+
+---
+
+## 2026-05-18 (Sunday)
+
+**Token Economics, Chat Export, and UI Layout Fixes**
+
+Implemented token economics with real API token extraction from OpenAI responses, stats propagation through the session pipeline, and a context window fuel gauge. Added chat_export agent tool for markdown/JSON session export. Fixed home sidebar layout for independent scrolling sections.
+
+### Changes:
+- **Token Economics**: Implemented real API token extraction from OpenAI responses, stats propagation, and context window fuel gauge with auto-update.
+- **Logging**: Added DtpLog logging of all OpenAI API responses with raw response object capture.
+- **Chat Export**: Added `chat_export` agent tool for session export in markdown and JSON formats.
+- **UI**: Fixed home sidebar flex column layout with independent scrolling sections; added `lucide-react` icons.
+- **Config**: Added Qdrant and embedding model config types.
+
+---
+
 ## 2026-05-17 (Sunday)
 
 **Release Hardening, Subagent Improvements, and Workspace Intelligence**

README.md

@@ -41,6 +41,8 @@ pnpm dev
        │                    │                      │
        │ Socket.IO          │ MongoDB              │ Files
        │ JWT Auth           │ Redis                │ Git
+       │                    │ Qdrant               │
+       │                    │                      │
 ```
 
 ### How It Works
@@ -117,6 +119,7 @@ pnpm cli user password user@example.com newpassword
 - pnpm 10+
 - MongoDB on `localhost:27017`
 - Redis on `localhost:6379`
+- Qdrant on `localhost:6333` (for semantic search)
 - SSL certificates in `ssl/` directory (for dev servers)
 
 ### Build
@@ -196,6 +199,23 @@ npx tsx scripts/seed-test-drones.ts
 - Model/mode selection per session
 - Session statistics (tool calls, file ops, subagents)
 
+### Token Economics
+
+- Real API token extraction from OpenAI and Ollama responses
+- Token usage stats propagated through session pipeline
+- Context window fuel gauge with auto-update
+
+### Semantic Search
+
+- Qdrant-powered vector search over chat history
+- Embedding pipeline with Ollama and OpenAI support
+- Configurable embedding model and vector dimensions
+
+### Chat Export
+
+- Export chat sessions as markdown or JSON
+- Agent tool for automated session export
+
 ### Workspace Management
 
 - Each drone manages a workspace directory
@@ -253,5 +273,5 @@ Apache 2.0 — See [LICENSE](./LICENSE) for details.
 
 ---
 
-**Status:** v1.0.1 — First release. Self-hosted agentic engineering platform with local/self-hosted AI model support, complete Chat Session UI, subagent processing, and workspace management.  
+**Status:** v1.0.1 — Self-hosted agentic engineering platform with local/self-hosted AI model support, complete Chat Session UI, subagent processing, workspace management, token economics, and Qdrant semantic search.  
-**Last Updated:** May 17, 2026
+**Last Updated:** May 19, 2026