Stage M-B: autonomous events -- EV-DONE / EV-BORN / EV-DIED published by the kernel itself (FABRIC-3.9.0 §7.3, M-3..M-6)

- Permanent event channels 1/2/3 created at boot beside channel 0, exposed
  as FORTH constants EV-DONE / EV-BORN / EV-DIED; CHANNEL-CLOSE refuses 0..3.
- sk_hermes_event(): `S" <name>" ON-...` as type 32 to every member except
  the VM it's about; never blocks -- undeliverable copies are dropped,
  counted (EV-DROPPED), printed and logged.
- Fired for participants only: EV-DONE from the switch trampoline when real
  work runs dry (funded by the VM), EV-BORN at a LIVE VM's first naming
  (funded by the newborn), EV-DIED on KILL/reap after departure (funded by
  the root). VM.ev_real_work keeps event handling from firing EV-DONE, so
  mutual subscribers can't storm.

Console evidence identical on amd64/aarch64/riscv64: one BORN per birth,
one DONE per job run dry (2 queued -> 1), one DIED per KILL, no SEND in any
job text; storm guard: exactly one reaction; channels 1-3 unclosable;
non-joined VMs see nothing; EV-DROPPED 0. Flood probe (reverted): 32
delivered, 7 dropped and counted, never blocked, all heat returned.
dict_hash set changes by the 4 words (546), identical across ISAs;
acceptance passes with held=2048.

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

include/vm.h

@@ -692,6 +692,13 @@ typedef struct VM
                             *   word-execution heat to the VM that actually
                             *   ran the word, instead of item 4.1's hardcoded
                             *   vm_uuid_hera(). */
+    int ev_real_work;      /**< FABRIC-3.9.8 Stage M-B: set when this VM
+                            *   drains a message that is not itself an
+                            *   event; its switch trampoline fires EV-DONE
+                            *   and clears it when the queue then runs dry.
+                            *   Draining only events never fires EV-DONE --
+                            *   otherwise two VMs joined to EV-DONE would
+                            *   answer each other's completions forever. */
     /** @} */
 
     /** @name Owner identity + ACL capabilities (FABRIC-2.md §F.2/§F.16)