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

include/starkernel/artemis_sig.h

@@ -151,15 +151,27 @@ typedef struct {
                                   * boundary" convention homeblocks_sig_t
                                   * uses for an identity's own pool. */
 
-    uint32_t log_region_offset;    /* Devblock offset where the growable
-                                    * per-VM log-persistence region starts;
-                                    * 0 = not yet allocated. */
-    uint32_t log_region_devblocks; /* Current reserved size of the log
-                                    * region, in devblocks -- grows over
-                                    * time (same growable-reservation
-                                    * mechanism the metadata fence design
-                                    * already uses elsewhere), not a single
-                                    * fixed guess made once at genesis. */
+    uint32_t log_region_offset;    /* CORRECTION, Step 4 (log_region.h,
+                                    * 2026-09-13): stays 0 -- informational
+                                    * field only, never written or read by
+                                    * the real implementation. The log
+                                    * region ended up at a fixed, compile-
+                                    * time devblock_from_top constant
+                                    * (LOG_REGION_DEVBLOCK_FROM_TOP_BASE,
+                                    * log_region.h) reached through
+                                    * blk_meta_zone_*(), whose own control
+                                    * header (log_region_ctrl_t) is the one
+                                    * authoritative source of the region's
+                                    * live offset/size/head/tail -- a second
+                                    * writer of the same fact here would be
+                                    * unnecessary drift risk, not a useful
+                                    * summary. Left at 0/reserved rather
+                                    * than deleted, in case a real second
+                                    * reader (a host-side offline tool that
+                                    * can't run blk_meta_zone_*() at all)
+                                    * ever needs it. */
+    uint32_t log_region_devblocks; /* See log_region_offset above -- same
+                                    * reasoning, stays 0. */
 
     uint64_t hdr_crc;            /* Computed over every field above this
                                   * one, same boundary/discipline as