Add VM-HEAT primitive: groundwork for a compudynamic turn-attractor (FABRIC-3.md §XIX)

Prompted by reading the std79-doe K report: checked whether the campaign's
"real cross-VM dispatch load" was actually concurrent or strictly
serialized. It's serialized at two levels -- VM-EXEC's vm_interpret(target,
...) is a direct synchronous C call (Hera fully blocked until it returns),
and even the background physics tick (vm_tick(), vm_runtime.c) is driven
by each VM's own execution loop, so idle identities accrue zero ticks
between their own turns. K's perfect conservation (FABRIC-3.md §XVIII)
verifies sequential per-VM accounting correctness, not concurrent-access
safety, since there was never concurrent access to test.

Agreed direction: fix this without a scheduler, by reusing the same
least-dense-candidate judgment stadium_admit() already trusts for
eviction, applied to "whose turn is next" instead of "who gets evicted" --
a fleet-level turn-attractor giving the next turn to whichever live
identity currently has the lowest execution_heat_q48, no fixed round-robin,
no priorities, no preemption. Lives beside Stadium in
capsule_vm_physics.c (already the fleet-level consumer of Stadium
primitives, e.g. the K mechanism itself), not inside stadium.c ("the
floor" -- residency/eviction, a different concern from turn order) and
not a new subsystem.

This pass lands only the primitive the mechanism needs: VM-HEAT
( c-addr u -- heat-q48 ), pushing a named VM's current
execution_heat_q48 via vm_physics_heat_of() -- previously C-internal
only (doe_log_heat_by_name(), doe_log.c), never exposed to FORTH. Silent
0 on an unknown/dead name (no print/error), since a turn-attractor
scanning many candidates every turn shouldn't have to filter console
noise for names that simply aren't live. Registered everywhere
VM-EXEC/VM-CALL already are. Builds clean on all three architectures;
live-tested on amd64: Hera -> 65452, Hermes -> 43, unknown name -> 0, no
faults.

The turn-attractor loop itself (std79-doe.fth's trial ordering) is not
yet built -- next step, not done here.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01EXieurDfDSsDFdnSyusuWo

FABRIC-3.md

@@ -2692,3 +2692,65 @@ wire (same interleaving effect as §XVII's write-up, just landing on a different
 unaffected either way, since the K result does not depend on trial attribution being correct at
 all.
 
+## XIX. VM-HEAT primitive: groundwork for a compudynamic turn-attractor (2026-09-12)
+
+**The real null hypothesis behind §XVIII's K result.** Reading the report prompted the right
+question: was execution actually concurrent across the 9 live identity VMs, or strictly
+serialized? Checked against the code, not assumed: `VM-EXEC` (`mama_word_vm_exec`,
+`mama_forth_words.c`) calls `vm_interpret(target, cmd_buf)` directly on Hera's own call stack --
+a synchronous C call, not a thread or coroutine switch. Hera is fully blocked until the target
+VM's interpretation returns; exactly one VM's FORTH code executes at any instant. Worse, even
+the *background* physics tick is not uniform across the fleet: `vm_tick()` (`vm_runtime.c`) is
+called from *each VM's own* execution loop, driven by *that VM's own* word dispatch -- its own
+doc comment already documents this as a previously-fixed bug (fleet physics used to gate on
+Hera's tick count specifically and "almost never fired, since Hera-as-orchestrator mostly blocks
+on VM-EXEC/VM-CALL dispatch that accrues to the target VM's tick count, not hers"). Net effect:
+while VM A holds the turn, the other 8 identities accrue *zero* ticks and call `vm_tick()` *zero*
+times -- completely dormant between their own turns, not just "not currently executing a word."
+
+**What this means for §XVIII's result.** K's perfect conservation verifies that each individual
+admit/evict/reservoir-transfer event was internally correct across many sequential events on 9
+different VMs. It is **not** evidence about concurrent-access safety, because there was never any
+concurrent access for it to be evidence of -- at any instant at most one VM's heat is changing,
+everything else is static, so the fleet sum staying constant is a real check on the *sequential*
+accounting, not a stronger claim about contention. Worth being honest about rather than letting
+the report's "real cross-VM dispatch load" phrasing be read as implying more than it tested.
+
+**Design direction agreed with Captain Bob: fix the gap without a scheduler.** A fixed
+round-robin across identities would just be a different hardcoded policy -- not in the spirit of
+a runtime whose whole design principle is finding its own attractors rather than being told what
+to do. The chosen direction instead reuses a judgment this codebase already trusts elsewhere:
+`stadium_admit()` picks the least-dense (coolest) resident as its eviction candidate when a
+quota is full. Turn allocation is the same kind of decision -- "whose turn is next" instead of
+"who gets evicted" -- so the plan is a fleet-level turn-attractor that gives the next turn to
+whichever live identity VM currently has the lowest `execution_heat_q48`, not a fixed sequence
+position. A VM idle longer becomes relatively cooler and naturally rises to the front; a VM
+mid-burst stays hot and cedes turns. No priority levels, no time slices, no preemption -- the
+same density comparison Stadium already uses, applied to "who goes next."
+
+**Scoping: not the floor, not a parking lot, not a new subsystem.** `stadium.c` is "the floor"
+in this project's own vocabulary (patrons "leave the floor" when reaped) -- its job is residency
+and eviction, not turn order, so this doesn't belong inside it. `capsule_vm_physics.c` already
+is the fleet-level layer that sits next to Stadium and consumes its primitives without living
+inside `stadium.c` itself (it's exactly how the K mechanism, §XVIII, is built) -- a turn-attractor
+reading per-VM heat to pick the coolest candidate is precisely the kind of fleet-wide decision
+this file already exists to make. No new subsystem needed.
+
+**Groundwork landed this pass: `VM-HEAT ( c-addr u -- heat-q48 )`** (`mama_forth_words.c`,
+registered in all three places `VM-EXEC`/`VM-CALL` already are -- Hera's root vocabulary, her
+MAMA vocabulary, and `register_child_vm_words()`). Pushes the named VM's current
+`execution_heat_q48` via `vm_physics_heat_of()` -- previously C-internal only
+(`doe_log_heat_by_name()`, `doe_log.c`), never exposed to FORTH. Silent 0 on an unknown/dead
+name (no print, no error) -- a turn-attractor scanning many candidate names every turn shouldn't
+have to filter console noise for names that simply aren't live. Builds clean, zero warnings, on
+all three architectures; live-tested on amd64 (single boot, zuse only): `S" Hera" VM-HEAT .` -->
+`65452`, `S" Hermes" VM-HEAT .` --> `43`, `S" NoSuchVM" VM-HEAT .` --> `0`, all as expected, no
+faults.
+
+**Not yet built: the turn-attractor loop itself.** This pass added only the primitive
+(`VM-HEAT`) the mechanism needs, not the mechanism -- `std79-doe.fth`'s trial loop still runs
+each of the 27 shuffled (identity, replicate) cells to completion in shuffle order, unchanged
+from §XV. The actual heat-driven "coolest live identity goes next" turn loop, and re-verifying
+the whole campaign (including whether K still holds under genuinely interleaved multi-VM
+contention, which is the actual point of building this) is the next step, not done here.
+

capsules/BLOCK_MAP.md

@@ -1,5 +1,5 @@
 # Capsule Block Manifest — Auto-generated
-<!-- Generated by mkcapsule --manifest  2026-09-12T17:15:30Z -->
+<!-- Generated by mkcapsule --manifest  2026-09-12T18:51:37Z -->
 <!-- DO NOT EDIT — re-run mkcapsule --manifest to refresh.  -->
 <!-- Hand-written justifications and immutability notes live  -->
 <!-- in MANIFEST.md alongside this auto-generated index.      -->

experiments/bare_metal/latest/amd64.csv

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src/starkernel/capsule/mama_forth_words.c

@@ -865,6 +865,53 @@ static void mama_word_vm_call(VM *vm)
     }
 }
 
+/**
+ * @brief VM-HEAT ( c-addr u -- heat-q48 )
+ * Push the named VM's current execution_heat_q48 (Q48.16, 0 if the VM is
+ * unknown/dead), via vm_physics_heat_of() -- previously C-internal only
+ * (doe_log_heat_by_name(), doe_log.c), never exposed to FORTH. Added
+ * 2026-09-12 for a compudynamic turn-attractor (FABRIC-3.md §XIX): "whose
+ * turn is next" decided by comparing live candidates' own current heat via
+ * this word, the same density-comparison judgment stadium_admit() already
+ * makes for eviction, rather than a fixed round-robin order. Silent on an
+ * unknown name (returns 0, does not print/error) -- callers scanning many
+ * VM names each turn to find the coolest one should not have to filter
+ * console noise for names that are simply not currently live.
+ */
+static void mama_word_vm_heat(VM *vm)
+{
+    char        vm_name[VM_NAME_MAX];
+    uint32_t    i;
+    cell_t      vm_u, vm_caddr;
+    const char *src;
+    VMRegistryEntry entry;
+
+    if (vm->dsp < 1) { vm->error = 1; return; }
+
+    vm_u     = vm_pop(vm);
+    vm_caddr = vm_pop(vm);
+
+    if (vm_u <= 0 || (uint32_t)vm_u >= VM_NAME_MAX) {
+        vm_push(vm, 0);
+        return;
+    }
+
+    {
+        const uint8_t *p = vm_ptr(vm, (vaddr_t)vm_caddr);
+        if (!p) { vm->error = 1; return; }
+        src = (const char *)p;
+    }
+    for (i = 0; i < (uint32_t)vm_u; i++) vm_name[i] = src[i];
+    vm_name[vm_u] = '\0';
+
+    if (capsule_vm_find_by_name_nocase(vm_name, &entry) != 0) {
+        vm_push(vm, 0);
+        return;
+    }
+
+    vm_push(vm, (cell_t)vm_physics_heat_of(entry.vm_id));
+}
+
 /**
  * @brief MINT ( -- ok? )
  * Mint a fresh identity onto the currently attached USB drive
@@ -1586,6 +1633,7 @@ void register_mama_forth_words(VM *vm)
     register_word(vm, "VM-STEP", mama_word_vm_step);
     register_word(vm, "VM-EXEC", mama_word_vm_exec);
     register_word(vm, "VM-CALL", mama_word_vm_call);
+    register_word(vm, "VM-HEAT", mama_word_vm_heat);
     register_word(vm, "CAPSULE-TEST", mama_word_capsule_test);
 
     /* Create and switch to MAMA vocabulary */
@@ -1623,6 +1671,7 @@ void register_mama_forth_words(VM *vm)
     register_word(vm, "VM-STEP", mama_word_vm_step);
     register_word(vm, "VM-EXEC", mama_word_vm_exec);
     register_word(vm, "VM-CALL", mama_word_vm_call);
+    register_word(vm, "VM-HEAT", mama_word_vm_heat);
     register_word(vm, "CAPSULE-TEST", mama_word_capsule_test);
     register_word(vm, "EXEC", mama_word_exec);
 
@@ -1837,6 +1886,7 @@ void register_child_vm_words(VM *vm)
     register_word(vm, "EXEC",    mama_word_exec);
     register_word(vm, "VM-EXEC", mama_word_vm_exec);
     register_word(vm, "VM-CALL", mama_word_vm_call);
+    register_word(vm, "VM-HEAT", mama_word_vm_heat);
     /* USE (FABRIC-2.md §F.24): not console-specific -- any VM can
      * redirect the physical REPL to any other VM it has ACL access to
      * (BINDSTEP re-verifies on every call, §F.9), including a console