Real per-VM log persistence: source attribution + ACL pin (FABRIC-3.md §XXVII)

Wires the previously-unused vm_log_attributed_vm() into LOG-APPEND's kernel
primitive so persisted log records carry a trustworthy source (the real
attributed VM's registry name, or "HADES" pseudo-source) instead of a
caller-supplied, trivially forgeable string. Drops src-addr/src-u from
LOG-APPEND's stack signature accordingly. Pins LOG-APPEND via bare ACL-PIN
in Artemis's own init.4th, matching BIRTH/CAPSULE-BIRTH's precedent for a
privileged word that can't reach the shared, host-portable ACL.4th.

Also fixes two console-banner nitpicks: a mis-rendering em dash (U+2014)
in the boot banner, and drops "Emergency" from the CLI banner text.

Doc corrections to artemis_sig.h/zuse_eligibility_list.h reconciling the
three fixed devblock ranges now in play. LOG-FLUSH (the intended normal
entry point) and level-aware log eviction remain open, flagged not fixed.

Re-verified clean boot to ok> on all 3 architectures after every change.
riscv64 showed one new, unrelated virtio_blk write-timeout anomaly during
Artemis's early physics self-test (self-recovered, boot unaffected,
sector doesn't map to the log region) -- flagged, not investigated.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016UNhH1mhi52i6Qihh7ZV5S

capsules/artemis/init.4th

@@ -537,3 +537,18 @@ Block 4858
   S" BLK-ATTACH-ACK" ACK-APPEND
   BLK-ATTACH-EVENT 2 0 ATTACH-ACK-BUF
   ATTACH-ACK-LEN @ 0 MSG-SEND ;
+
+Block 4860
+( LOG-APPEND ( level ts msg-addr msg-u -- )                   )
+( FABRIC-3.md SXXVI follow-on Step 4, 2026-09-13: real per-VM )
+( log persistence, reached via a sender's LOG-FLUSH/MSG-SEND  )
+( round trip, or by hand at the console for a smoke test.     )
+( Thin wrapper -- kernel-only (LOG-APPEND-RAW) (log_words.c/  )
+( log_region.c) does the real disk write; never calls         )
+( log_message() (see log_region.c's own doc comment on why).  )
+( CORRECTION, same day: dropped src-addr/src-u, forgeable --  )
+( source now comes from vm_log_attributed_vm() kernel-side.   )
+( Pinned: writes straight to disk, bypasses log_message().    )
+: LOG-APPEND ( level ts msg-addr msg-u -- )
+  (LOG-APPEND-RAW) ;
+' LOG-APPEND ACL-PIN