Add CLAUDE.md documentation for AI-assisted development

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
+
+ACS Fleet Manager is a Red Hat Advanced Cluster Security (ACS) managed service that allows users to request and manage ACS instances through the Red Hat Cloud Console. The service consists of two main components:
+
+- **Fleet Manager**: Control plane service that accepts user requests and manages ACS instance provisioning
+- **Fleetshard-sync**: Data plane component that provisions ACS instances on OpenShift clusters
+
+## Common Commands
+
+### Build and Development
+```bash
+# Build all binaries and generate OpenAPI
+make all
+
+# Build only binaries
+make binary
+
+# Generate code (OpenAPI, mocks, etc.)
+make generate
+
+# Clean build artifacts
+make clean
+```
+
+### Testing
+```bash
+# Run unit tests
+make test
+
+# Run integration tests
+make test/integration
+
+# Run E2E tests
+make test/e2e
+
+# Run specific test with flags
+make test TESTFLAGS="-run TestSomething"
+
+# Run AWS integration tests
+make test/aws
+```
+
+### Database Operations
+```bash
+# Setup local database
+make db/setup
+
+# Run database migrations
+make db/migrate
+
+# Teardown local database
+make db/teardown
+
+# Access database CLI
+make db/login
+```
+
+### Code Quality
+```bash
+# Lint code
+make lint
+
+# Verify code (includes vet and OpenAPI validation)
+make verify
+
+# Check code formatting
+make code/check
+
+# Fix code formatting
+make code/fix
+
+# Validate OpenAPI specifications
+make openapi/validate
+```
+
+### Development Environment
+```bash
+# Bootstrap development environment
+make deploy/bootstrap
+
+# Deploy to development cluster
+make deploy/dev
+
+# Fast redeploy for development
+make deploy/dev-fast
+
+# Reset E2E test environment
+make test/e2e/reset
+```
+
+### Container Images
+```bash
+# Build container image
+make image/build
+
+# Push image to registry
+make image/push
+
+# Build specific component images
+make image/build/probe
+make image/build/emailsender
+```
+
+## Architecture
+
+### Core Components
+
+1. **Fleet Manager** (`cmd/fleet-manager/`) - Main control plane service
+2. **Fleetshard-sync** (`fleetshard/`) - Data plane synchronization service
+3. **Probe** (`probe/`) - Health check and monitoring service
+4. **Emailsender** (`emailsender/`) - Email notification service
+5. **Fleetshard Operator** (`fleetshard-operator/`) - Kubernetes operator for fleet management
+
+### Key Directories
+
+- `internal/central/` - Central service implementation (main business logic)
+- `pkg/` - Shared packages and utilities
+- `openapi/` - OpenAPI specifications for all APIs
+- `docs/` - Documentation including architecture and development guides
+- `templates/` - Kubernetes/OpenShift deployment templates
+- `dev/env/` - Development environment configuration
+- `e2e/` - End-to-end test suites
+
+### Service Architecture
+
+The codebase follows a dependency injection pattern using the `goava/di` framework:
+
+- `internal/central/providers.go` - Main dependency injection configuration
+- Services are organized into:
+  - **Services**: Business logic (`internal/central/pkg/services/`)
+  - **Workers**: Background reconciliation (`internal/central/pkg/workers/`)
+  - **Handlers**: API endpoints (`internal/central/pkg/handlers/`)
+  - **Presenters**: Data transformation (`internal/central/pkg/presenters/`)
+
+### Database
+
+- Uses PostgreSQL with GORM ORM
+- Database migrations in `internal/central/pkg/migrations/`
+- Local development uses Docker container
+
+### Testing Strategy
+
+- Unit tests: Standard Go testing with testify
+- Integration tests: Test against real database and external services
+- E2E tests: Use Ginkgo framework for comprehensive end-to-end scenarios
+- AWS integration tests: Test cloud provider integrations
+
+## Development Workflow
+
+### Environment Setup
+1. Install prerequisites: Go 1.23+, Docker, Node.js, Java, OCM CLI
+2. Run `make setup/git/hooks` to install pre-commit hooks
+3. Use `make deploy/bootstrap` to set up development cluster
+4. Run `make deploy/dev` to start local development environment
+
+### Code Generation
+- OpenAPI client/server code is generated - never edit generated files directly
+- Run `make generate` after modifying OpenAPI specs or adding `//go:generate` directives
+- Generated files are in `internal/central/pkg/api/` and other `*_moq.go` files
+
+### Pre-commit Hooks
+- golangci-lint for Go code quality
+- shellcheck for shell scripts
+- detect-secrets for security scanning
+- Generated files verification
+- Code formatting checks
+
+### Configuration
+- Environment-specific configs in `dev/config/`
+- Secret files in `secrets/` directory (use `make secrets/touch` to create empty files)
+- Multiple cluster types supported: minikube, kind, colima, CRC, OpenShift
+
+## Important Notes
+
+- Always run `make lint` and `make verify` before committing
+- Database migrations are applied automatically on startup
+- The service uses Red Hat SSO for authentication
+- Multiple API specs: public, private, and admin APIs
+- Container images are built for linux/amd64 platform
+- Use `./scripts/fmcurl` for API testing
+- Fleet manager stores state in PostgreSQL, fleetshard-sync is stateless