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

harnesses/contexts/agent-repo/v1/harness.yaml

@@ -0,0 +1,19 @@
+kind: context
+name: agent-repo
+version: 1
+description: "Agent repo workspace: reference/working split, auto-commit, branch-per-task"
+requires: []
+provides: [project-repo]
+
+scripts:
+  init: "./init.sh"
+  finalize: "./finalize.sh"
+
+env:
+  AGENT_WORKING_DIR: "/workspace/project"
+  # Injected by dispatcher at task start — defaults shown for documentation only
+  AGENT_REPO_URL: ""
+  AGENT_BRANCH: ""
+  REFERENCE_BRANCHES: "[]"
+
+secrets_required: []