Add CLAUDE.md for Claude Code guidance

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

Author: aarondfrancis

CLAUDE.md

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+# CLAUDE.md
+
+This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
+
+## Project Overview
+
+Airdrop is a Laravel package that speeds up deployments by skipping asset compilation when possible. It calculates a hash of build inputs (packages, JS/CSS files, ENV vars, etc.) and reuses previously built assets if the configuration hasn't changed.
+
+Full docs: https://hammerstone.dev/airdrop/docs
+
+## Commands
+
+```bash
+# Run tests
+vendor/bin/phpunit
+
+# Run a single test
+vendor/bin/phpunit --filter test_name
+
+# Code formatting
+vendor/bin/pint
+
+# Check formatting without changes
+vendor/bin/pint --test
+```
+
+## Architecture
+
+**Drivers** (`src/Drivers/`) - Handle storage/retrieval of built assets:
+- `BaseDriver` - Abstract base with `download()` and `upload()` methods
+- `FilesystemDriver` - Uses Laravel's filesystem (local, S3, etc.)
+- `GithubActionsDriver` - Uses GitHub Actions cache
+
+**Triggers** (`src/Triggers/`) - Determine what affects the build hash:
+- Implement `TriggerContract::triggerBuildWhenChanged($config)`
+- `FileTrigger` - Hashes file contents
+- `ConfigTrigger` - Hashes config values
+
+**Commands** (`src/Commands/`):
+- `airdrop:download` - Pull cached assets if hash matches
+- `airdrop:upload` - Store built assets with current hash
+- `airdrop:hash` - Output current hash
+- `airdrop:debug` - Debug trigger outputs
+- `airdrop:install` - Publish config file
+
+## Code Style
+
+Uses Laravel Pint with the Laravel preset. Key customizations in `pint.json`:
+- `concat_space`: one space around concatenation operator
+- `trailing_comma_in_multiline`: false