refactor(execution): correct residual agent ownership wording

Post-promotion boundary correction: replace the standalone-agent and
terminal-session wording in doc.go/types.go/main.go with provider-only,
run-scoped descriptions and add a Node CLI regression that rejects Agent
wording. Promotion and recovery evidence is preserved untouched.

apps/node/cmd/node/main.go

@@ -26,7 +26,7 @@ func main() {
 func rootCmd() *cobra.Command {
 	root := &cobra.Command{
 		Use:   "node",
-		Short: "IOP Node Agent — runs adapter executions on this device",
+		Short: "IOP Node — runs provider executions on this device",
 	}
 	root.PersistentFlags().StringVarP(&cfgFile, "config", "c", "configs/node.yaml", "config file path")
 

apps/node/cmd/node/main_test.go

@@ -45,6 +45,17 @@ func TestRootCmdIncludesOperationalCommands(t *testing.T) {
 	}
 }
 
+func TestRootCmdUsesProviderOnlyDescription(t *testing.T) {
+	short := rootCmd().Short
+	lower := strings.ToLower(short)
+	if !strings.Contains(lower, "provider") {
+		t.Errorf("root command Short must describe provider execution; got %q", short)
+	}
+	if strings.Contains(lower, "agent") {
+		t.Errorf("root command Short must not claim Agent ownership; got %q", short)
+	}
+}
+
 func TestVersionCmdPrintsVersion(t *testing.T) {
 	root := rootCmd()
 	var out bytes.Buffer

packages/go/execution/doc.go

@@ -1,5 +1,5 @@
-// Package execution contains the host-neutral execution contract shared by
-// IOP Node and standalone agent hosts. It owns provider lifecycle, streaming
-// events, typed failures, registry lifecycle, and terminal session primitives;
+// Package execution contains provider-only, host-neutral execution contracts
+// shared by Node and Edge-facing provider transports. It owns provider
+// lifecycle, streaming events, typed failures, and registry lifecycle;
 // host wire translation remains outside this package.
 package execution

packages/go/execution/types.go

@@ -12,7 +12,7 @@ import (
 // Providers must not use it to identify, resume, or retain a process.
 const DefaultSessionID = "default"
 
-// ErrRunCancelled is returned by adapters when a run is cancelled without terminating the session.
+// ErrRunCancelled is returned by providers when a single run is cancelled.
 var ErrRunCancelled = errors.New("run cancelled")
 
 // ExecutionSpec is the resolved, policy-applied specification for a single run.