init: seed framework reference content from agent-runtimes main repo

harnesses/contexts/anthropic-cloud/v1/harness.yaml

@@ -0,0 +1,14 @@
+kind: context
+name: anthropic-cloud
+version: 1
+description: "Anthropic cloud — subscription OAuth token + pricing enforcement"
+requires: []
+provides: [claude-code]
+
+env:
+  ENFORCE_SUBSCRIPTION_PRICING: "true"
+
+secrets_files:
+  - source: ./provider.sops.env
+    target: /opt/harness/secrets/anthropic-cloud/provider.sops.env
+    encrypted: true