fix(compaction): surface safeguard cancel reasons and clarify /compact skips (#51072)

Merged via squash.

Prepared head SHA: f1dbef044384fbd79ca5ef3616ad37fb03b05fae
Co-authored-by: afurm <6375192+afurm@users.noreply.github.com>
Co-authored-by: jalehman <550978+jalehman@users.noreply.github.com>
Reviewed-by: @jalehman

src/cli/program/preaction.test.ts

@@ -203,7 +203,6 @@ describe("registerPreActionHooks", () => {
 
   it("handles debug mode and plugin-required command preaction", async () => {
     const processTitleSetSpy = vi.spyOn(process, "title", "set");
-
     await runPreAction({
       parseArgv: ["status"],
       processArgv: ["node", "openclaw", "status", "--debug"],