feat: add smithery.yaml for Smithery registry publishing

Enables publishing to Smithery.ai MCP server registry. Configures
stdio transport with uvx runtime and prompts for API key and URL.

https://claude.ai/code/session_01LV2F6VAyLq2cZexnxSprkw

Author: claude

smithery.yaml

@@ -0,0 +1,23 @@
+# Smithery configuration file: https://smithery.ai/docs/build/project-config/smithery-yaml
+startCommand:
+  type: stdio
+  configSchema:
+    type: object
+    required:
+      - outlineApiKey
+    properties:
+      outlineApiKey:
+        type: string
+        description: "Outline API key (Settings > API)"
+      outlineApiUrl:
+        type: string
+        description: "Outline API URL for self-hosted instances"
+  commandFunction: |-
+    (config) => ({
+      command: 'uvx',
+      args: ['mcp-outline'],
+      env: {
+        OUTLINE_API_KEY: config.outlineApiKey,
+        ...(config.outlineApiUrl ? { OUTLINE_API_URL: config.outlineApiUrl } : {})
+      }
+    })