Fix COOL's misleading (stub) label too

Same fix as DELIVER, on request. COOL is real and live for both words
(item 4.1) and VMs (this session) -- stadium_evict()'s own universal
reservoir credit is the whole of what "cooling off the floor" means
for both, no extra payload action needed. stadium_dispatch()'s COOL
case now prints the departing patron's identity (word_id for a word,
0 -- the patron-zero convention -- for a VM) instead of "(stub)".

Verified live: both shapes fired correctly on the same boot --
"COOL identity=0" at Hermes's/Artemis's own explicit channel-eviction
self-test and again at their VM-patron eviction at PARITY:KILL,
"COOL identity=1" at a second channel eviction -- conservation intact
throughout. Clean zero-warning compile and clean boot with
conservation intact on all three architectures.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CXjAPTEKrgY2Mrk25KoLDn

FABRIC-3.md

@@ -404,10 +404,14 @@ other three become honest, explicit punch-list items instead of being touched sp
   `DELIVER` case now prints the departing message's real identity (`DELIVER msg_idx=N`, same
   shape as `MIGRATE`'s `lbn=` print) instead of a misleading `(stub)` label — confirmed live
   via a forced `MSG-SEND`/`MSG-DELIVER-ALL`/`MSG-ACK-LAST` sequence from Hermes's own REPL
-  context (`Stadium: dispatch cell=73653 behaviour=DELIVER msg_idx=1`). `COOL`'s case is in
-  the identical situation (real for both words and VMs, no extra action needed) but was left
-  printing `(stub)` — out of scope for this pass, noted in `stadium.c`'s own comment. Clean
-  zero-warning compile and clean boot with conservation intact on all three architectures.
+  context (`Stadium: dispatch cell=73653 behaviour=DELIVER msg_idx=1`). `COOL`'s case was in
+  the identical situation (real for both words and VMs, no extra action needed) and, on
+  request, got the same fix (2026-08-26): now prints `COOL identity=N` (word_id for a word, 0
+  — the patron-zero convention — for a VM) instead of `(stub)`. Confirmed live: both shapes
+  fired correctly on the same boot — `COOL identity=0` at Hermes's/Artemis's own explicit
+  channel-eviction self-test and again at their VM-patron eviction at `PARITY:KILL`,
+  `COOL identity=1` at a second channel eviction — conservation intact throughout. Clean
+  zero-warning compile and clean boot on all three architectures for both fixes.
 - [ ] `EXPIRE` (ACL) — confirmed genuinely unscoped (2026-08-26), not a case of stale
   documentation like `DELIVER` turned out to be. Two findings, then four open questions that
   need a real decision before any code:

src/starkernel/vm/stadium.c

@@ -272,10 +272,16 @@ uint8_t *stadium_header_bitmap(void) {
  * message's identity, same shape as MIGRATE's lbn print, instead of
  * claiming to be unimplemented.
  *
- * EXPIRE (ACL) and COOL (VMs, item 3.5) print "(stub)"/status text for
- * their own separate reasons -- EXPIRE has no ACL-Stadium integration of
- * any kind yet (FABRIC-3.md §B, genuinely unscoped); COOL's own status is
- * documented at its own case below.
+ * COOL (words, item 4.1; VMs, FABRIC-3.md §B) needs no extra payload action
+ * here either, same reasoning as DELIVER: stadium_evict()'s own universal
+ * reservoir credit is the whole of what "cooling off the floor" means for
+ * both patron kinds -- real and live for both since item 4.1 and this
+ * session respectively. Fixed the same way, to print the departing
+ * patron's identity (word_id for a word, 0 -- the patron-zero convention --
+ * for a VM) instead of a misleading "(stub)" label.
+ *
+ * EXPIRE (ACL) alone remains genuinely unbuilt -- no ACL-Stadium
+ * integration of any kind exists yet (FABRIC-3.md §B).
  */
 void stadium_dispatch(size_t cell_index, StadiumBehaviour behaviour) {
     console_puts("Stadium: dispatch cell=");
@@ -300,13 +306,13 @@ void stadium_dispatch(size_t cell_index, StadiumBehaviour behaviour) {
         case STADIUM_BEHAVIOUR_EXPIRE:
             console_println("EXPIRE (stub)");
             break;
-        case STADIUM_BEHAVIOUR_COOL:
-            /* Real for words (item 4.1) and VMs (FABRIC-3.md SS B) -- both
-             * confirmed to need no extra payload action here either, same
-             * reasoning as DELIVER above. Left printing "(stub)" for now:
-             * only DELIVER's label was in scope for this fix. */
-            console_println("COOL (stub)");
+        case STADIUM_BEHAVIOUR_COOL: {
+            uint64_t identity = stadium_cell_array[cell_index].header.identity;
+            console_puts("COOL identity=");
+            console_put_u64(identity);
+            console_println("");
             break;
+        }
     }
 }