docs: add AGENTS.md and symlink CLAUDE.md to it

AGENTS.md

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+# AGENTS.md
+
+This file provides guidance to AI coding agents when working with code in this repository.
+
+## Project Overview
+
+Kubernetes node agent for Civo cloud that monitors cluster nodes and triggers automatic hard reboots via the Civo API when nodes become NotReady or lose expected GPU capacity. Deployed as a single-replica Deployment in kube-system via Helm.
+
+## Build & Test Commands
+
+```bash
+# Build
+go build -o node-agent ./
+
+# Run all tests
+go test ./...
+
+# Run a single test
+go test ./pkg/watcher/ -run TestName
+
+# Build Docker image (dry-run)
+goreleaser release --snapshot --skip=publish --clean
+```
+
+No linter is configured in CI.
+
+## Architecture
+
+**Entrypoint** (`main.go`): Reads env vars, sets up JSON structured logging (slog), creates a Watcher, and runs it with graceful SIGTERM/SIGINT shutdown.
+
+**Core package** (`pkg/watcher/`):
+- `watcher.go` — Main loop polls every 10 seconds. For each node matching the node pool label (`kubernetes.civo.com/civo-node-pool={nodePoolID}`), checks if the node is NotReady or has fewer GPUs than desired. If a reboot is warranted (and cooldown window hasn't elapsed), calls `HardRebootInstance` via the Civo API.
+- `options.go` — Functional options pattern (`WithKubernetesClient`, `WithCivoClient`, etc.) for dependency injection and configuration.
+- `fake.go` — `FakeClient` implementing `civogo.Clienter` for testing.
+- `watcher_test.go` — Tests use fake Kubernetes client (`k8s.io/client-go/kubernetes/fake`) and `FakeClient` for Civo API.
+
+**Reboot safeguards**: Tracks last reboot time per node in a `sync.Map`. Skips reboot if the node's Ready/NotReady condition transitioned recently or a reboot command was sent within the configurable time window (default 40 minutes).
+
+## Required Environment Variables
+
+`CIVO_API_KEY`, `CIVO_REGION`, `CIVO_CLUSTER_ID`, `CIVO_NODE_POOL_ID` — see `.env.example`.
+
+Optional: `CIVO_API_URL`, `CIVO_NODE_DESIRED_GPU_COUNT`, `CIVO_NODE_REBOOT_TIME_WINDOW_MINUTES`.
+
+## Deployment
+
+Helm chart in `charts/`. Secrets are expected in `civo-node-agent` and `civo-api-access` Kubernetes secrets.
+
+```bash
+helm upgrade -n kube-system --install node-agent ./charts
+```
+
+## Key Dependencies
+
+- `github.com/civo/civogo` — Civo cloud API client
+- `k8s.io/client-go` — Kubernetes client (in-cluster config by default)
+
+## Release
+
+Tags matching `v*.*.*` trigger `.github/workflows/release-image.yaml`, which builds multi-arch Docker images via goreleaser and publishes to Docker Hub.

CLAUDE.md

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+AGENTS.md