Add CLAUDE.md documentation

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
+
+The OCM Agent Operator is a Kubernetes operator that manages the OCM Agent service on managed OpenShift clusters. It's built using the Operator SDK framework and follows standard Kubernetes operator patterns.
+
+## Development Commands
+
+### Setup
+```bash
+make tools                    # Install required development tools (ginkgo, mockgen, etc.)
+```
+
+### Build and Test
+```bash
+make go-build                 # Build the operator binary
+make go-test                  # Run unit tests (also: go test ./...)
+make lint                     # Run Go linting and static analysis
+```
+
+### Run Locally
+```bash
+make run                      # Run operator against ~/.kube/config cluster
+make run-verbose              # Run with verbose logging (zap-log-level=5)
+```
+
+### Container-based Development
+```bash
+boilerplate/_lib/container-make        # Run make inside boilerplate container
+boilerplate/_lib/container-make generate  # Generate mocks in container environment
+```
+
+## Architecture
+
+### Core Components
+- **API Types** (`api/v1alpha1/`): Defines the OcmAgent, ManagedNotification, and ManagedFleetNotification custom resources
+- **Controllers** (`controllers/`):
+  - `ocmagent/`: Reconciles OcmAgent resources, manages deployments, services, secrets, etc.
+  - `fleetnotification/`: Handles fleet-wide notification resources
+- **OCM Agent Handler** (`pkg/ocmagenthandler/`): Business logic for managing OCM Agent resources (deployment, configmap, secrets, network policies, PDB, service monitor)
+
+### Key Custom Resources
+- **OcmAgent**: Main resource defining OCM agent configuration, image, token secret, replicas, and fleet mode
+- **ManagedNotification**: Handles cluster-specific notifications
+- **ManagedFleetNotification**: Manages fleet-wide notifications across multiple clusters
+
+### Dependencies
+- Built with Kubernetes 1.31.x APIs
+- Uses controller-runtime framework for operator logic
+- Integrates with Prometheus for monitoring via ServiceMonitor resources
+- Uses Ginkgo/Gomega for testing
+- Requires Go 1.22.7+
+
+## Testing
+
+### Framework
+- Uses Ginkgo BDD testing framework with Gomega matchers
+- Mock generation via GoMock for interface testing
+- Tests organized by package with `_suite_test.go` files
+
+### Test Commands
+```bash
+make go-test                  # Run all tests
+ginkgo -r                     # Run tests recursively with Ginkgo
+```
+
+### Mock Generation
+Regenerate mocks after interface changes:
+```bash
+boilerplate/_lib/container-make generate
+```
+
+## Code Generation
+
+The operator uses code generation for:
+- Kubernetes deepcopy methods
+- OpenAPI schemas
+- Mock interfaces for testing
+
+Always run `make` after modifying API types to regenerate required code.