feat(tools): add minio.share upload and presigned link tool

README.md

@@ -26,6 +26,7 @@ Self-hosted personal AI assistant with Telegram and Terminal interfaces.
 - **Inbound Webhooks**: HTTP endpoints that trigger agent processing with HMAC auth and template rendering
 - **Heartbeat Monitor**: Periodic health checks (gateway, model, channels, memory, disk) with failure notifications
 - **Scheduled Backups**: Interval- or cron-based snapshot backups with optional startup run
+- **MinIO File Sharing Tool**: Upload a local file and return a temporary MinIO share link via `minio.share`
 - **Gmail Pub/Sub Watcher**: Monitor Gmail inbox via Google Cloud Pub/Sub push notifications with polling fallback
 - **Vector Memory Search**: Hybrid keyword + semantic search with embeddings (OpenAI, Gemini, Ollama, llama.cpp, Voyage AI)
 - **Docker Deployment**: Multi-stage Dockerfile and docker-compose.yml for production containers
@@ -603,6 +604,14 @@ backup:
     secure: true
 ```
 
+## MinIO Share Tool
+
+When `backup.minio.enabled` is configured, Flynn also exposes a `minio.share` tool:
+
+- Uploads a local file to the configured MinIO bucket
+- Returns a temporary download URL (`mc share download`)
+- Useful for sharing CSVs, logs, images, and generated artifacts without dumping file contents in chat
+
 ## Inbound Webhooks
 
 HTTP endpoints that trigger agent processing. Each webhook accepts POST requests, optionally verifies an HMAC signature, renders a message template, and routes the agent's response to an output channel.