feat(log): LOG-FLUSH -- a VM's log records reach Artemis's log ring; and the ring keeps its order when it grows

FABRIC-3 SXXXII.4's deferred LOG-FLUSH, built to the 2026-10-14 rulings
(SXXXVIII): everything a VM logs, at or above the log level, goes into its
own buffer; it goes to Artemis on LOG-FLUSH, when full, and at once on an
ERROR, as one kernel-Hermes LOG_BATCH message she writes on her own turn,
the source being the sender the kernel stamped.  Records that cannot go yet
are counted and reported with the next flush.  LOG-SHOW (Hera only) reads
the ring back -- it had no reader.

Found by the first test that filled it: ring growth overwrote the oldest
record and put blank slots inside the live range.  Fixed test first.

Three ISAs: POST 1052 passed; new parity baseline word_count=526
hash=0x82f4ae7cb2e2d424 (deliberate).  CLAUDE.md: Phase 8 PKI closed.

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

capsules/BLOCK_MAP.md

@@ -1,5 +1,5 @@
 # Capsule Block Manifest — Auto-generated
-<!-- Generated by mkcapsule --manifest  2026-10-14T15:35:50Z -->
+<!-- Generated by mkcapsule --manifest  2026-10-14T16:07:07Z -->
 <!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh.  -->
 <!-- Hand-written justifications and immutability notes live  -->
 <!-- in MANIFEST.md alongside this auto-generated index.      -->

capsules/artemis/init.4th

@@ -512,8 +512,9 @@ Block 4856
 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.     )
+( log persistence, by hand at the console for a smoke test. )
+( LOG-FLUSH does not come through here: since 2026-10-14 a    )
+( VM's records reach the ring in C, vm_log_buffer.c.          )
 ( 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).  )