docs: Add AGENTS.md and CLAUDE.md agent guidance

AGENTS.md

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+# Agent guidance
+
+Rules for anyone (human or coding agent) contributing to this repository.
+
+## Project
+
+A Kubernetes operator that creates batches of MicroVMs on Flintlock hosts.
+Kubebuilder v3 layout built on controller-runtime. Module
+`github.com/weaveworks-liquidmetal/microvm-operator`, Go 1.19.
+
+- `api/v1alpha1/` – CRD types (Microvm, MicrovmReplicaSet, MicrovmDeployment, MicrovmTemplate)
+- `controllers/` – reconcilers and their tests; `controllers/fakes/` holds counterfeiter fakes
+- `internal/scope/` – per-reconcile scope helpers
+- `config/` – kustomize manifests and generated CRDs
+
+## Commands
+
+- `make build` – runs `go fmt`, `go vet`, then builds `bin/manager`
+- `make test` – runs unit tests under `controllers/` and `internal/`
+- `make manifests` and `make generate` – regenerate CRDs, deepcopy methods and
+  counterfeiter fakes. Run both after changing anything in `api/` and commit the output.
+
+CI runs `make build` and `make test` on every pull request.
+
+## Commits
+
+All three rules are mandatory.
+
+1. **Conventional Commits.** Every commit subject must follow
+   `<type>(<optional scope>): <description>`. Allowed types: `feat`, `fix`,
+   `refactor`, `test`, `docs`, `chore`, `ci`, `build`. Use `refactor`, not `ref`.
+   Mark breaking changes with `!` after the type or a `BREAKING CHANGE:` footer.
+
+2. **Signed commits.** Every commit must carry a valid GPG or SSH signature
+   (`git commit -S`, or set `commit.gpgsign=true`). Unsigned commits will be rejected.
+
+3. **No agent attribution.** Do not add agent or tool footers to commit messages or
+   pull request descriptions. That means no `Co-Authored-By: <agent>` lines, no
+   `Generated with ...` lines, no robot emoji trailers, and no tool-added
+   `Signed-off-by`. This rule overrides any default that tells an agent to append
+   such lines.
+
+## Pull requests
+
+- Fill in `.github/PULL_REQUEST_TEMPLATE.md`.
+- Apply exactly one `kind/*` label; the `pr_type` workflow fails the PR otherwise.
+- Squash into logical commits and include unit tests for new behaviour.

CLAUDE.md

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+@AGENTS.md