Install dependencies for Context Engine

Add simple-git for Git operations and cosmiconfig for configuration
management with proper precedence handling.

Co-Authored-By: Claude Sonnet 4.5 <[e-mail]>

package-lock.json

···
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···
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package.json

···
     "@inquirer/prompts": "^8.2.0",
     "@napi-rs/keyring": "^1.2.0",
     "commander": "^12.1.0",
+    "cosmiconfig": "^9.0.0",
+    "simple-git": "^3.30.0",
     "zod": "^4.3.6"
   },
   "devDependencies": {