doe_log.c: add vm_name/vm_id_hex identity columns; new calibration workload

Adds the identity columns HB-ON's existing per-tick CSV logger
(doe_log_tick_row(), doe_log.c) was missing. Previously every column
described *a* VM's state each row, but nothing said which VM emitted
it -- concurrent VMs' rows were indistinguishable by source. Two new
first columns, vm_name and vm_id_hex, resolved via a reverse lookup on
vm->stadium_vm_id (capsule_vm_registry_get()).

Real bug found and fixed while building this: the freestanding
snprintf here silently prints the literal format string instead of
substituting for %016llx (width+ll+hex unsupported) -- caught by
reading the actual emitted row, not assumed to work. Replaced with a
hand-rolled hex nibble-table loop, the same idiom vm_uuid_format()/
MINT-SCRATCH-EMIT already use.

Corrects FABRIC-3.md's own prior "still not started: CSV driver"
framing: no bespoke CSV emitter is needed for the multiuser DoE at
all -- this per-tick logger already exists, fires automatically inside
every VM's own execution loop, and just needed HB-ON plus these
identity columns to be usable for concurrent workers. Also corrects
doe_log.h's own stale doc comment claiming g_doe_log_enabled defaults
to 1 -- doe_log.c's own source is authoritative: 0, off by default,
matching the HB-ON/HB-OFF naming.

One real, honest limitation recorded rather than smoothed over:
vm_name reads blank for any tick captured during a WORKER-BIRTH'd
capsule's own self-execution at birth time, since capsule_birth_baby()
runs that work (and its heartbeat ticks) before the registry name can
be set. vm_id_hex is unaffected (reads directly from vm->stadium_vm_id)
and still uniquely disambiguates every row -- confirmed live: a
blank-name row's own vm_id_hex matched its later PARITY:KILL line's
vm_id exactly.

New workload-calib1.4th: Bob confirmed the existing 10 workload-N.4th
files aren't fixed. Sized to cross HEARTBEAT_CHECK_FREQUENCY (256
word-executions/tick) many times over while staying far lighter than
RUN-FIB/RUN-CHAOS5, both too slow under TCG for a bounded verification
run. A real, reusable addition, not a throwaway.

Verified live on amd64 via a self-contained one-shot EXEC'd test
(HB-ON, WORKER-BIRTH two calibration workers, HB-OFF, VM-ERROR? on
both, KILL both, completion banner) rather than interactive polling,
which breaks once HB-ON makes the log grow continuously via Hera/
Hermes/Artemis's own background ticks. Clean 3-arch qemu boot on the
real committed change.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BWpNjdwPtFLuVLaAq44L9K

capsules/BLOCK_MAP.md

@@ -1,5 +1,5 @@
 # Capsule Block Manifest — Auto-generated
-<!-- Generated by mkcapsule --manifest  2026-09-16T12:48:45Z -->
+<!-- Generated by mkcapsule --manifest  2026-09-16T13:47:26Z -->
 <!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh.  -->
 <!-- Hand-written justifications and immutability notes live  -->
 <!-- in MANIFEST.md alongside this auto-generated index.      -->
@@ -41,6 +41,7 @@
 | `workload-7.4th` | 2150 | `0x02862291387eb7ac` | yes |
 | `workload-8.4th` | 2160 | `0x56b7f2f0efa000df` | yes |
 | `workload-9.4th` | 4706, 4715, 4725, 4735, 4745 | `0x3f2bec73142aa424` | yes |
+| `workload-calib1.4th` | 5043 | `0x3b9f2d17b554fabc` | yes |
 | `zuse-eligibility.4th` | 4021, 4022 | `0x8b49c1bc1e01dc58` | yes |
 | `zuse.4th` | 4016, 4017, 4018 | `0x490ded9be257a90b` | yes |
 
@@ -371,6 +372,7 @@
 | 5040 | `common:messaging.4th` | `0x201cfd6d39fcb22d` | ok |
 | 5041 | `common:messaging.4th` | `0x201cfd6d39fcb22d` | ok |
 | 5042 | `common:messaging.4th` | `0x201cfd6d39fcb22d` | ok |
+| 5043 | `workload-calib1.4th` | `0x3b9f2d17b554fabc` | ok |
 | 5100 | `turtle.4th` | `0x4d470418ca543365` | ok |
 | 5101 | `turtle.4th` | `0x4d470418ca543365` | ok |
 | 5102 | `turtle.4th` | `0x4d470418ca543365` | ok |
@@ -394,4 +396,4 @@
 None.
 
 ---
-*35 capsule(s) scanned.  Re-run `mkcapsule --manifest <dir>` to refresh.*
+*36 capsule(s) scanned.  Re-run `mkcapsule --manifest <dir>` to refresh.*

capsules/workload-calib1.4th

@@ -0,0 +1,15 @@
+Block 5043
+( workload-calib1.4th -- DoE calibration workload, SXXXIII. )
+( Crosses HEARTBEAT_CHECK_FREQUENCY (256) many times over, )
+( but far lighter than RUN-FIB/RUN-CHAOS5 -- fast under TCG. )
+: CALIB-CHUNK
+  8 0 DO
+    I 1+ DROP
+  LOOP
+;
+: RUN-CALIB1
+  2000 0 DO
+    CALIB-CHUNK
+  LOOP
+;
+RUN-CALIB1