fix(memory-flush): ban timestamped variant files in default flush prompt (#34951)

Merged via squash.

Prepared head SHA: efadda4988
Co-authored-by: zerone0x <39543393+zerone0x@users.noreply.github.com>
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Reviewed-by: @jalehman

src/infra/process-respawn.test.ts

@@ -68,6 +68,7 @@ describe("restartGatewayProcessWithFreshPid", () => {
   });
 
   it("returns supervised when launchd/systemd hints are present", () => {
+    clearSupervisorHints();
     process.env.LAUNCH_JOB_LABEL = "ai.openclaw.gateway";
     const result = restartGatewayProcessWithFreshPid();
     expect(result.mode).toBe("supervised");