refactor: Optimize TypeScript configs and fix build ordering

- Create shared libs/tsconfig.base.json to eliminate duplication across 6 packages
- Update all lib tsconfig.json files to extend base config
- Fix build ordering to ensure sequential dependency chain (types -> utils -> platform/model-resolver/dependency-resolver -> git-utils)
- Add .gitignore patterns to prevent compiled files in src directories

Resolves PR review issues #3 and #4

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

libs/git-utils/tsconfig.json

@@ -1,19 +1,8 @@
 {
+  "extends": "../tsconfig.base.json",
   "compilerOptions": {
-    "target": "ES2020",
-    "module": "commonjs",
-    "lib": ["ES2020"],
-    "types": ["node"],
-    "declaration": true,
-    "declarationMap": true,
     "outDir": "./dist",
-    "rootDir": "./src",
-    "strict": true,
-    "esModuleInterop": true,
-    "skipLibCheck": true,
-    "forceConsistentCasingInFileNames": true,
-    "resolveJsonModule": true,
-    "moduleResolution": "node"
+    "rootDir": "./src"
   },
   "include": ["src/**/*"],
   "exclude": ["node_modules", "dist"]