Stage H: DoE rebuilt on BIRTH/SEND/KILL, defs-only workloads; work heat floor on contact (FABRIC-3.8 §3.9, §3.13.7)

Workload capsules the DoE births are definitions only; each defines WL-RUN
(its old birth-time work plus its entry word twice) and WL-DONE-ARGS. The
driver births N workers, SENDs each 'WL-RUN WL-DONE-ARGS SEND', waits in an
ordinary loop for N MU-DONE messages, KILLs them (parked idle), and emits
the marker. The serialized VM-EXEC round-robin is gone.

Kernel: no switch checkpoint after a payload's last word; work heat is the
assessed per-beat charge, and a VM gaining work is raised to the busy set's
floor (Captain Bob's ruling) -- fixes a live stall where a busy-waiting Hera
never yielded, without serializing batch starts.

Evidence: cfg-4 rows spread evenly over Hera and all 8 worker slots (44k
switches); full cfg-4 trials on amd64/aarch64/riscv64 end fail=0 with 8/8
KILL dead; Stage G interleave byte-identical on all three. Acceptance:
dict_hash unchanged, relay 3, idle growth 0.

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

capsules/workload-9.4th

@@ -12,7 +12,6 @@ Block 4706
 
 Block 4715
 ( Rising edge with random perturbation )
-42 SEED
 : RISING-EDGE ( steps -- )
   0 DO
     I 1+
@@ -41,11 +40,8 @@ Block 4725
     TRIANGLE-CYCLE
   LOOP DROP ;
 
-3 10 TRIANGLE-WAVE
-
 Block 4735
 ( Asymmetric triangles - fast rise, slow fall )
-7777 SEED
 : ASYM-TRIANGLE ( -- )
   8 0 DO
     I 1+ 80 120 RANDOM 100 */ RAMP-STEP
@@ -56,14 +52,11 @@ Block 4735
     80 120 RANDOM WAIT
   LOOP ;
 : RUN-ASYM 4 0 DO ASYM-TRIANGLE LOOP ;
-RUN-ASYM
 
 Block 4745
 
 ( Sawtooth variant - all rise, sharp drop )
 
-54321 SEED
-
 : SAWTOOTH ( steps -- )
   0 DO
     I 1+ 85 115 RANDOM 100 */ RAMP-STEP
@@ -72,4 +65,7 @@ Block 4745
   50 WAIT ;
 
 : RUN-SAW 3 0 DO 12 SAWTOOTH LOOP ;
-RUN-SAW
+( FABRIC-3.8 3.9: defs only; the DoE SENDs WL-RUN )
+: WL-RUN 42 SEED 3 10 TRIANGLE-WAVE 7777 SEED RUN-ASYM
+  54321 SEED RUN-SAW RUN-SAW RUN-SAW ;
+: WL-DONE-ARGS S" MU-DONE" S" Hera" ;