implements basic header and installs oat

AGENTS.md

@@ -9,6 +9,7 @@ This file provides guidelines for AI coding agents working in this repository.
 - **Framework**: Astro 5.x
 - **Package Manager**: pnpm
 - **Module System**: ES Modules (`"type": "module"`)
+- **Shell**: Either use `bash` when in `direnv` or `fish` when used on my personal devices. Do not use `zsh`
 
 ## Project Structure
 
@@ -39,15 +40,9 @@ pnpm preview          # Preview production build locally
 pnpm astro check      # Run Astro + TypeScript type checking
 ```
 
-### Linting & Formatting (Biome)
+### Formatting
 
-```bash
-biome check .                 # Check linting and formatting
-biome check --write .         # Auto-fix linting and formatting issues
-biome format --write .        # Format files only
-biome lint .                  # Lint files only
-biome lint --write .          # Auto-fix lint issues only
-```
+Use prettier for formatting
 
 ### Testing
 
@@ -199,18 +194,11 @@ direnv allow
 nix develop
 ```
 
-The Nix shell provides: Node.js, pnpm, Biome, PostgreSQL, and language servers.
-
-## VS Code Integration
-
-Recommended extensions are configured in `.vscode/extensions.json`:
-
-- Astro language support
-- Biome for formatting/linting
+The Nix shell provides: Node.js, pnpm, PostgreSQL, and language servers.
 
 ## Before Committing
 
 1. Run type checking: `pnpm astro check`
-2. Run linting/formatting: `biome check --write .`
+2. Run formatting: `pnpm format` (prettier)
 3. Build successfully: `pnpm build`
 4. Test locally if applicable: `pnpm preview`