🌱 Add AGENTS.md to assist AI agents interacting with this repository

AGENTS.md

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+# AGENTS.md
+
+This file provides instructions for autonomous agents working in the operator-controller repository.
+
+## Repository Context
+
+This is **operator-controller**, part of OLM v1. Two main Go binaries: `operator-controller` and `catalogd`. Kubernetes controllers using controller-runtime framework. Focus on simplicity, security, predictability.
+
+## Search and Exploration Guidelines
+
+### When searching for code:
+
+**Controllers and reconciliation logic:**
+- ClusterExtension controller: `internal/operator-controller/controllers/clusterextension_controller.go`
+- ClusterCatalog controller: `internal/catalogd/controllers/core/`
+- Look for `Reconcile()` methods and `SetupWithManager()` functions
+
+**API definitions:**
+- All CRDs defined in `api/v1/*_types.go`
+- Generated DeepCopy code: `api/v1/zz_generated.deepcopy.go`
+- CRD manifests (generated): `helm/olmv1/base/*/crd/standard/`
+
+**Resolution and bundle handling:**
+- Bundle resolution: `internal/operator-controller/resolve/`
+- Bundle rendering: `internal/operator-controller/rukpak/render/`
+- Catalog metadata: `internal/operator-controller/catalogmetadata/`
+
+**Testing:**
+- Unit tests: Co-located with source files (`*_test.go`)
+- E2E tests: `test/e2e/`, `test/experimental-e2e/`, `test/extension-developer-e2e/`
+- Test helpers: `test/helpers/`
+
+### Search patterns to use:
+
+**Find controller setup:**
+```
+Pattern: "SetupWithManager"
+Files: internal/*/controllers/**/*.go
+```
+
+**Find API validations:**
+```
+Pattern: "+kubebuilder:validation"
+Files: api/v1/*.go
+```
+
+**Find feature gates:**
+```
+Pattern: "features."
+Directories: internal/*/features/
+```
+
+**Find HTTP/catalog endpoints:**
+```
+Pattern: "http.HandleFunc|HandleFunc"
+Files: internal/catalogd/
+```
+
+## Code Modification Guidelines
+
+### CRITICAL: Do not modify generated files
+
+These files are AUTO-GENERATED - never edit directly:
+- `api/v1/zz_generated.deepcopy.go`
+- `helm/olmv1/base/*/crd/**/*.yaml`
+- Any file in `manifests/` directory
+- `config/` directory files
+
+To update these, run: `make generate`, `make update-crds`, or `make manifests`
+
+### When modifying API types:
+
+1. Edit `api/v1/*_types.go` only
+2. Add kubebuilder markers for validation/printing
+3. Run `make generate` to regenerate DeepCopy methods
+4. Run `make update-crds` to regenerate CRD manifests
+5. Run `make manifests` to regenerate deployment manifests
+6. Always run `make verify` before considering task complete
+
+### When modifying controllers:
+
+1. Controllers must implement `reconcile.Reconciler` interface
+2. Use controller-runtime patterns (client, scheme, logging)
+3. Update status conditions using metav1.Condition
+4. Handle finalizers properly for cleanup
+5. Add unit tests using ENVTEST framework
+6. Run `make test-unit` to verify
+
+### When adding dependencies:
+
+1. Add to `go.mod` via `go get`
+2. Run `make tidy`
+3. For Kubernetes dependencies, may need `make k8s-pin` to align versions
+4. Check if `.bingo/` managed tools need updating
+
+## Testing Requirements
+
+### Before completing any code change:
+
+1. **Format and lint:**
+   ```bash
+   make fmt
+   make lint
+   ```
+
+2. **Run unit tests:**
+   ```bash
+   make test-unit
+   ```
+
+3. **Verify generated code is current:**
+   ```bash
+   make verify
+   ```
+
+### For new features:
+
+1. Add unit tests in `*_test.go` files
+2. Use `envtest` for controller tests
+3. Add e2e tests in appropriate directory
+4. Document new features in `docs/`
+
+### Test execution patterns:
+
+```bash
+# Single test function
+go test -v ./path/to/package -run TestSpecificFunction
+
+# With ENVTEST (for controller tests)
+KUBEBUILDER_ASSETS="$(./bin/setup-envtest use -p path 1.31.x)" \
+  go test -v ./internal/operator-controller/controllers
+
+# E2E on kind cluster
+make test-e2e  # Full standard e2e suite
+make test-experimental-e2e  # Experimental features
+```
+
+## File Organization Patterns
+
+### Controller structure:
+```
+internal/{component}/controllers/
+├── {resource}_controller.go       # Main reconciliation logic
+├── {resource}_controller_test.go  # ENVTEST-based tests
+└── suite_test.go                  # Test suite setup
+```
+
+### Package structure:
+```
+internal/{component}/
+├── controllers/      # Reconcilers
+├── features/        # Feature gates
+├── {package}/       # Business logic packages
+└── scheme/          # Scheme registration
+```
+
+## Common Pitfalls to Avoid
+
+1. **Don't edit manifests directly** - They're generated from Helm charts
+2. **Don't skip `make verify`** - It catches generated code drift
+3. **Don't use cluster-admin** - Design for least-privilege ServiceAccount
+4. **Don't assume multi-tenancy** - This is explicitly NOT supported
+5. **Don't hardcode namespaces** - Use `olmv1-system` constant or config
+6. **Don't ignore RBAC** - All operations via ServiceAccount
+7. **Don't skip preflight checks** - CRD upgrade safety is critical
+
+## Architecture Context for Agents
+
+### Data Flow:
+1. User creates ClusterCatalog → catalogd unpacks → HTTP server serves content
+2. User creates ClusterExtension → operator-controller queries catalogd
+3. Resolver selects bundle → Renderer processes manifests → Applier deploys
+4. Status conditions updated throughout lifecycle
+
+### Key Interfaces:
+- `reconcile.Reconciler`: All controllers implement this
+- `client.Client`: Kubernetes API interactions
+- `Resolver`: Bundle selection logic
+- `Applier`: Manifest application via boxcutter
+
+### Security Model:
+- ServiceAccount specified in ClusterExtension.spec.serviceAccount
+- All manifest application uses that ServiceAccount's permissions
+- No privilege escalation - user's SA permissions = installation permissions
+
+## Build and Deployment Context
+
+### Make targets for common tasks:
+
+**Development cycle:**
+```bash
+make build          # Compile binaries
+make test-unit     # Fast feedback
+make verify        # Ensure generated code current
+```
+
+**Full validation:**
+```bash
+make test          # All tests (unit, e2e, regression)
+make lint         # Code quality
+```
+
+**Local deployment:**
+```bash
+make run           # Build, deploy to kind, includes cleanup
+make run-experimental  # Same but with experimental features
+```
+
+### Environment variables:
+
+- `OPCON_IMAGE_REPO`: operator-controller image repository
+- `CATD_IMAGE_REPO`: catalogd image repository
+- `IMAGE_TAG`: Image tag (default: devel)
+- `KIND_CLUSTER_NAME`: Kind cluster name
+- `INSTALL_DEFAULT_CATALOGS`: Install default catalogs (true/false)
+
+## Reporting Back to User
+
+### When completing search tasks:
+
+Provide:
+1. Exact file paths with line numbers
+2. Relevant code snippets
+3. Context about what the code does
+4. Related files user might need to check
+
+### When completing code modification tasks:
+
+Report:
+1. Files modified with brief description of changes
+2. Any generated files that need regeneration
+3. Make commands that need to be run
+4. Test results if tests were run
+5. Any remaining work or considerations
+
+### When encountering issues:
+
+Report:
+1. Exact error messages
+2. What was attempted
+3. Relevant logs or output
+4. Suggestions for resolution or what to investigate
+
+## Quick Reference
+
+**Find definition of**: `grep -r "type {Name} struct" api/`
+**Find usages of**: `grep -r "{identifier}" internal/`
+**Find tests for**: Look for `*_test.go` in same directory
+**Check generated**: `make verify` (fails if drift detected)
+**Run specific test**: `go test -v ./path -run TestName`
+**Validate changes**: `make fmt && make lint && make test-unit && make verify`