feat(workflow): cpw-smoke@1 one-node cp_write template for Option C smoke run (690b330f)

Claude-Session: https://claude.ai/code/session_01N218bERyNeLhbLmDRDvbWF

task-templates/workflow/cpw-smoke@1.yaml

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+name: cpw-smoke
+version: 1
+description: One-node cp_write smoke test for Option C (AU-55 per-step write token); exercises workflow-script-write/v1 end to end on a throwaway item
+runtime: script
+input:
+  state: scoped-tagged
+  tags_required: []
+  required_artifacts: []
+output:
+  state: test-skeleton-ready
+scope_budget:
+  files_modified_max: 1
+  lines_diff_max: 1
+  wall_clock_seconds_max: 300
+agent_repo:
+  url: "git@gitea.oreillyit.nz-ai-enablement:skynet/agent-runtimes.git"
+nodes:
+  - id: state-tx
+    kind: script
+    cmd: scripts/workflow/state-tx
+    cp_write: true
+    on_fail: refuse_dispatch
+    runtime_env:
+      CP_URL: "https://agents.oreillyit.nz/api"
+      STATE_TX_NEW_STATE: test-skeleton-ready
+      STATE_TX_FROM_STATES: scoped-tagged