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

harnesses/contexts/z-ai/v1/harness.yaml

@@ -0,0 +1,19 @@
+kind: context
+name: z-ai
+version: 1
+description: "Z.ai GLM coding plan — Anthropic-compatible proxy"
+requires: []
+provides: [claude-code]
+
+env:
+  ANTHROPIC_BASE_URL: "https://api.z.ai/api/anthropic"
+  CLAUDE_CODE_DISABLE_EXPERIMENTAL_BETAS: "1"
+  CLAUDE_CODE_DISABLE_NONESSENTIAL_TRAFFIC: "1"
+  DISABLE_PROMPT_CACHING: "1"
+
+secrets_files:
+  - source: ./provider.sops.env
+    target: /opt/harness/secrets/z-ai/provider.sops.env
+    encrypted: true
+
+# TODO: Add network_hosts for api.z.ai when context harnesses support it