chore: move compiled output to dist

Update the plugin entrypoint and TypeScript output directory to use dist instead of writing generated JavaScript into src.

Remove previously checked-in compiled source files and add coverage for the Ollama client and tool executor.

package.json

@@ -2,7 +2,7 @@
   "name": "ollama-plugin",
   "version": "1.0.0",
   "description": "Ollama integration plugin for Obsidian",
-  "main": "main.ts",
+  "main": "dist/main.js",
   "scripts": {
     "test": "jest",
     "build": "tsc",