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

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