Strip SPAWN-EVENT from messaging.4th -- FABRIC-3.6.md task 0.4

Dead per task 0.1's reachability check (156d1642): zero references by
name anywhere in the tree outside its own definition -- process.4th's
own SPAWN/PAUSE/RESUME/KILL-VM calls passed bare numeric literals
(1/2/3/4), never this constant's name. Removed the single line only;
PAUSE-EVENT/RESUME-EVENT/KILL-EVENT are left in place, matching the
punchlist's stated scope -- they are equally dead-by-name but that
widening was flagged in 0.1's findings, not folded into this task.

mkcapsule --lint capsules/ clean, 37 files / 0 violations, unchanged
(one-line edit, no file added or removed). Three-arch boot clean:
amd64/aarch64/riscv64 all reach [zuse@Hera] ok>, zero UNKNOWN WORD.
dict_hash moved for Hermes/Artemis (both load messaging.4th) and is
identical across all three architectures; Hera's PARITY:M7.1a snapshot
unchanged as in the prior two strips.

Phase 0's three strips (0.2-0.4) are now all done. capsule-reserved.txt
and MANIFEST.md's stale block-4055/2049 entries remain for 0.5/0.6.

Authorized by Captain Bob ("Yes, please continue.").

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

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