Stage O-C: the event-driven DoE driver -- DOE returns to the prompt, EV-DONE chains the trials, MU-WAIT-ALL deleted (FABRIC-3.9.0 §3/§7.4)

- DOE sets up, JOINs EV-DONE and starts trial 1, then returns. Each trial
  births and sends WL-RUN only; completion arrives as the OS's EV-DONE.
- ON-DONE counts this campaign's own workers while active; the last one
  ends the trial (KILL all, marker, persist) and starts the next, or
  finishes (HB-OFF, UNJOIN, MU-CAMPAIGN: complete). MU-WAIT-ALL is gone;
  the start/end cycle goes through MU-END-XT.
- WL-DONE-ARGS removed from all ten workload capsules; lint passes.

Smoke campaign (amd64, 1 rep, rows off per Captain Bob): DOE returns, the
prompt answers mid-trial, all 6 trials chain on events, fail=0 each,
28/28 born/killed/departed, MU-CAMPAIGN: complete in ~61 min. Standard
sequence passes on all three ISAs (with the xHCI fix it exposed, df150e86).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

capsules/workload-4.4th

@@ -32,4 +32,3 @@ Block 2132
 ;
 ( FABRIC-3.8 3.9: defs only; the DoE SENDs WL-RUN )
 : WL-RUN RUN-PI ." 4:dopi-ok" CR RUN-PI RUN-PI ;
-: WL-DONE-ARGS S" MU-DONE" S" Hera" ;