test(ax): add workspace command example coverage

Co-Authored-By: Virgil <virgil@lethean.io>

.core/reference/docs/RFC.md

@@ -423,6 +423,7 @@ Every exported function MUST have a usage-example comment:
 
 ## Changelog
 
+- 2026-03-30: `pkg/agentic/commands_workspace.go` now has a matching example companion, closing the last agentic source file without example coverage.
 - 2026-03-30: plan files and review queue rate-limit state now use `WriteAtomic`, keeping JSON state writes aligned with the AX safe-write convention.
 - 2026-03-30: transport helpers preserve request and read causes, brain direct API calls surface upstream bodies, and review queue retry parsing no longer uses `MustCompile`.
 - 2026-03-30: direct Core process calls replaced the `proc.go` wrapper layer; PID helpers now live in `pid.go` and the workspace template documents `c.Process()` directly.

docs/RFC.md

@@ -423,6 +423,7 @@ Every exported function MUST have a usage-example comment:
 
 ## Changelog
 
+- 2026-03-30: `pkg/agentic/commands_workspace.go` now has a matching example companion, closing the last agentic source file without example coverage.
 - 2026-03-30: plan files and review queue rate-limit state now use `WriteAtomic`, keeping JSON state writes aligned with the AX safe-write convention.
 - 2026-03-30: plan create tests now assert the documented `core.ID()` shape and repeated plan creation produces unique IDs, keeping the plan contract aligned with the simplified generator.
 - 2026-03-30: dispatch completion monitoring now uses a named helper instead of an inline Action closure, keeping the spawned-process finaliser AX-native.

pkg/agentic/commands_workspace_example_test.go

@@ -0,0 +1,35 @@
+// SPDX-License-Identifier: EUPL-1.2
+
+package agentic
+
+import (
+	"os"
+
+	core "dappco.re/go/core"
+)
+
+func ExamplePrepSubsystem_cmdWorkspaceClean() {
+	fsys := (&core.Fs{}).NewUnrestricted()
+	root := fsys.TempDir("agentic-workspace-clean-example")
+	defer fsys.DeleteAll(root)
+
+	previous, hadPrevious := os.LookupEnv("CORE_WORKSPACE")
+	_ = os.Setenv("CORE_WORKSPACE", root)
+	defer func() {
+		if hadPrevious {
+			_ = os.Setenv("CORE_WORKSPACE", previous)
+			return
+		}
+		_ = os.Unsetenv("CORE_WORKSPACE")
+	}()
+
+	s := &PrepSubsystem{
+		ServiceRuntime: core.NewServiceRuntime(core.New(), AgentOptions{}),
+	}
+
+	result := s.cmdWorkspaceClean(core.NewOptions())
+	core.Println(result.OK)
+	// Output:
+	// nothing to clean
+	// true
+}