docs: replace npm commands with bun in AGENTS.md

Updated all npm command references to use bun for better performance and consistency with the frontend's existing bun.lock file. This includes test commands, build commands, and linter commands.

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Co-Authored-By: AI Assistant <noreply@ai-assistant.com>

AGENTS.md

@@ -21,14 +21,14 @@ Adopt-a-Street is a community street adoption platform with a React frontend and
 
 After implementing any feature, fix, or update, you MUST:
 
-1. **Build and test** the changes:
-   ```bash
-   # Backend
-   cd backend && npm test
+ 1. **Build and test** the changes:
+    ```bash
+    # Backend
+    cd backend && bun test
 
-   # Frontend
-   cd frontend && npm run build
-   ```
+    # Frontend
+    cd frontend && bun run build
+    ```
 
 2. **Create a git commit** with a descriptive message:
    ```bash
@@ -68,15 +68,15 @@ This ensures:
 ## Commands
 
 ### Backend (from `/backend`)
-- `npm test` - Run all tests
-- `npx eslint .` - Run linter
+- `bun test` - Run all tests
+- `bunx eslint .` - Run linter
 - `node server.js` - Start development server
 
 ### Frontend (from `/frontend`)
-- `npm test` - Run all tests in watch mode
-- `npm test -- --testNamePattern="test name"` - Run single test
-- `npm run build` - Production build
-- `npm start` - Start development server
+- `bun test` - Run all tests in watch mode
+- `bun test -- --testNamePattern="test name"` - Run single test
+- `bun run build` - Production build
+- `bun start` - Start development server
 
 ## Code Style
 
@@ -198,16 +198,16 @@ Comprehensive test infrastructure is in place for both backend and frontend.
 Backend:
 ```bash
 cd backend
-npm test              # Run all tests
-npm run test:coverage # Run with coverage report
-npm run test:watch    # Run in watch mode
+bun test              # Run all tests
+bun run test:coverage # Run with coverage report
+bun run test:watch    # Run in watch mode
 ```
 
 Frontend:
 ```bash
 cd frontend
-npm test              # Run in watch mode
-npm run test:coverage # Run with coverage report
+bun test              # Run in watch mode
+bun run test:coverage # Run with coverage report
 ```
 
 ### Test Coverage