Implement NK-WP-0013 playbook capability contract

examples/playbook-capability-contract/README.md

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+# Playbook Capability Contract Examples
+
+`scenario-s1-host-bootstrap.yaml` demonstrates NetKingdom selecting and
+parametrizing a Railiance playbook from its declaration alone.
+
+Run it against the reference Railiance declaration:
+
+```bash
+python3 tools/playbook-capability-contract/playbook_contract_validator.py \
+  ../railiance-infra/capabilities/playbooks/railiance-infra.bootstrap-host.yaml \
+  --scenario examples/playbook-capability-contract/scenario-s1-host-bootstrap.yaml
+```

examples/playbook-capability-contract/scenario-s1-host-bootstrap.yaml

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+id: scenario:s1-host-bootstrap-reference
+authority: platform
+requires:
+  capabilities:
+    - s1.os-baseline
+parameter_overrides:
+  railiance-infra.bootstrap-host:
+    target_hosts:
+      - railiance01
+    swapfile_size_mb: 8192