docs: update README and add AGENTS.md

Update README with current deployment instructions and add
AGENTS.md for AI coding assistant guidelines.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: butler54

AGENTS.md

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+# CoCo Pattern — AI Coding Assistant Guidance
+
+This is a [Validated Pattern](https://validatedpatterns.io/) for deploying confidential containers (CoCo) on OpenShift.
+This file provides rules and context for any AI coding assistant working in this repository.
+
+## Critical Rules
+
+- **DO NOT** edit anything under `/common/`. It is a read-only Git subtree from the upstream validated patterns framework.
+- **DO NOT** commit secrets, credentials, or private keys. `values-secret.yaml.template` is a template only.
+- **DO NOT** use Kustomize. This project uses Helm exclusively.
+- **DO NOT** create charts with `apiVersion: v1`. Use `apiVersion: v2` (Helm 3+).
+- **DO NOT** place cloud-provider-specific logic in chart templates. Use `/overrides/` via `sharedValueFiles` instead.
+- **DO NOT** hardcode secrets in templates. Use External Secrets Operator with vault paths (see `charts/hub/trustee/templates/dynamic-eso.yaml` for reference).
+
+## Feature Development Precedence Order
+
+Use the **first** approach that fits your requirement:
+
+1. **Helm charts** — Declarative Kubernetes resources in `/charts/`, deployed by ArgoCD. Preferred for installing operators, configuring CRDs, and creating Kubernetes resources.
+2. **ACM policies** — Red Hat Advanced Cluster Management policies for propagating configuration from hub to spoke clusters and enforcing multi-cluster governance. Reference: `charts/hub/sandbox-policies/templates/`.
+3. **Imperative framework (Ansible)** — Playbooks in `/ansible/`, executed as Kubernetes Jobs on a 10-minute schedule. **Must be idempotent.** Use for API calls, runtime data lookups, and multi-step orchestration that cannot be expressed declaratively. Register playbooks in `clusterGroup.imperative.jobs` as an ordered list.
+4. **Out-of-band scripts** — `/scripts/` or `/rhdp/`. Last resort for one-time setup or local development tooling. These are not managed by GitOps.
+
+## Project Structure
+
+```text
+├── ansible/                        # Ansible playbooks (imperative jobs)
+├── charts/
+│   ├── all/
+│   │   └── letsencrypt/            # Shared across cluster groups
+│   ├── coco-supported/
+│   │   ├── baremetal/              # Bare-metal TDX configuration
+│   │   ├── hello-openshift/        # Sample workloads
+│   │   ├── kbs-access/             # KBS access verification workload
+│   │   └── sandbox/                # Sandboxed containers runtime
+│   └── hub/
+│       ├── lvm-storage/            # LVM storage for bare-metal
+│       ├── sandbox-policies/       # ACM policies (hub → spoke)
+│       └── trustee/                # Trustee / KBS
+├── common/                         # READ-ONLY — upstream framework subtree
+├── overrides/                      # Cloud-provider value overrides
+│   ├── values-AWS.yaml
+│   ├── values-Azure.yaml
+│   └── values-IBMCloud.yaml
+├── rhdp/                           # Red Hat Demo Platform tooling
+├── scripts/                        # Utility scripts
+├── values-global.yaml              # Global configuration
+├── values-simple.yaml              # Cluster group: simple
+├── values-baremetal.yaml           # Cluster group: baremetal
+├── values-trusted-hub.yaml         # Cluster group: trusted-hub
+├── values-untrusted-spoke.yaml     # Cluster group: untrusted-spoke
+└── values-secret.yaml.template     # Secrets template (never commit filled-in copy)
+```
+
+## Companion Chart Repositories
+
+Several charts in this repository have companion repositories for independent versioning and reuse. Develop and test in this repository first (charts deploy via `path:`), then sync changes to the companion repository.
+
+| Local Path | Companion Repository | Purpose |
+|---|---|---|
+| `charts/hub/trustee/` | `trustee-chart` | Trustee / KBS on hub |
+| `charts/hub/sandbox-policies/` | `sandboxed-policies-chart` | ACM policies hub → spoke |
+| `charts/coco-supported/sandbox/` | `sandboxed-containers-chart` | Sandboxed runtime on spoke |
+
+Large features may require coordinated changes across multiple companion repos. References are org-agnostic — contributors should fork all relevant repos as needed.
+
+## Cluster Groups
+
+Set via `main.clusterGroupName` in `values-global.yaml`.
+
+| Cluster Group | Values File | Role | Description |
+|---|---|---|---|
+| `simple` | `values-simple.yaml` | Hub (single cluster) | All components on one cluster |
+| `baremetal` | `values-baremetal.yaml` | Hub (single cluster) | TDX + LVM storage on bare metal |
+| `trusted-hub` | `values-trusted-hub.yaml` | Multi-cluster hub | Trustee + ACM policies |
+| `untrusted-spoke` | `values-untrusted-spoke.yaml` | Multi-cluster spoke | Sandbox runtime + workloads |
+
+## Values File Hierarchy
+
+Merge order (last wins):
+
+1. Chart defaults (`charts/<group>/<chart>/values.yaml`)
+2. `values-global.yaml`
+3. `values-<clustergroup>.yaml`
+4. `/overrides/values-{{ clusterPlatform }}.yaml` (via `sharedValueFiles`)
+5. `values-secret.yaml` (runtime only, never committed)
+
+Key conventions:
+
+- Global settings go under the `global:` key in `values-global.yaml`.
+- Subscriptions go under `clusterGroup.subscriptions:` in the cluster group values file.
+- Applications go under `clusterGroup.applications:` in the cluster group values file.
+- Local charts use `path:` (e.g., `path: charts/hub/trustee`). Shared framework charts use `chart:` + `chartVersion:`.
+- Imperative jobs go under `clusterGroup.imperative.jobs:` as an **ordered list** (not a hash — hashes lose ordering in Helm).
+
+## Helm Chart Conventions
+
+- Use `apiVersion: v2`. Place charts in `charts/<cluster-group>/<chart-name>/`.
+- Use ArgoCD sync-wave annotations to control deployment ordering.
+- Use `ExternalSecret` resources to pull secrets from vault. Reference: `charts/hub/trustee/templates/dynamic-eso.yaml`.
+- Use `.Values.global.clusterPlatform` for platform-conditional logic only when overrides files are insufficient.
+- Reference patterns:
+  - ESO integration: `charts/hub/trustee/templates/dynamic-eso.yaml`
+  - Template helpers: `charts/coco-supported/hello-openshift/templates/_helpers.tpl`
+
+## Ansible Playbook Conventions
+
+- Place playbooks in `/ansible/`. They **must be idempotent**.
+- Use `connection: local`, `hosts: localhost`, `become: false`.
+- Use `kubernetes.core.k8s` and `kubernetes.core.k8s_info` modules for cluster interaction.
+- Register playbooks in the cluster group values file under `clusterGroup.imperative.jobs` with `name`, `playbook`, `verbosity`, and `timeout` fields.
+
+## Git Workflow
+
+- **Fork-first**: ArgoCD reconciles against your fork. Clone and push to your own fork.
+- **Conventional commits**: Enforced by commitlint (`@commitlint/config-conventional`).
+- **Branch-based deployment**: The branch of your local checkout determines the ArgoCD deployment target.
+- **Changes require commit + push** to take effect — ArgoCD watches the remote.
+
+## Commands Reference
+
+All commands run via `./pattern.sh make <target>`:
+
+| Command | Purpose |
+|---|---|
+| `install` | Install the pattern and load secrets |
+| `show` | Render the starting template without installing |
+| `preview-all` | Preview all applications across cluster groups |
+| `validate-schema` | Validate values files against JSON schema |
+| `validate-cluster` | Validate cluster prerequisites |
+| `super-linter` | Run super-linter locally |
+| `load-secrets` | Load secrets into the configured backend |
+| `uninstall` | Uninstall the pattern |
+
+See the readme for secrets backend configuration, RHDP environment variables, and additional maintenance commands.
+
+## Validation and CI
+
+CI runs the following checks on pull requests:
+
+- **JSON schema validation** — values files validated against `common/clustergroup` schema
+- **Super Linter** — multi-language linting
+- **Conventional PR title lint** — PR titles must follow conventional commit format
+
+Run locally before pushing:
+
+```bash
+./pattern.sh make preview-all
+./pattern.sh make validate-schema
+```