docs(track-a): promote creature inbound static boundaries

[blakinio]

Coordinator promotion/closeout for researcher Draft #531 / OTC-20260818-track-a-s8-creature-inbound-static.

Decision: ACCEPT_BOUNDED_PARTIAL.
Source final head: 8b4080dd1b943b95bd3f5d626e3d8a8bcebc04b3.
Trusted promotion base: main@d53eec81bf718b1128fc8e7f9b0a53d991bf30bf.

Promoted facts:

TProtocolMessageQueue: 13 exact creature-family receive signals
TCreatureProtocolMessageHandler: QMeta 0x30cec80 / 0 methods / 0 signals
TCreature: positionWasUpdated + mark/party/inspection QMeta signals
TCreatureStorage: playerAdded / creatureUpdated / creatureAppearanceUpdated
TCreaturesGameActionHandler: sendAttack / sendFollow / sendLookAtCreature / party actions

A global exhaustive QMeta search found zero suffix-matched handleXMessage methods for the 13 creature receives. This is a bounded negative QMeta result; it does not disprove a non-QMeta dispatch path.

Retained stop boundary:

queue -> creature handler dispatch = UNKNOWN_NON_QMETA_WINDOW_REQUIRED
handler -> model/storage mutation = UNKNOWN
runtime creature delivery = NOT_OBSERVED
creature inbound repo-only QMeta frontier = EXHAUSTED

Source final CI 32140290731 and governance 32140290336 are green; reviews/threads 0/0. No new client bytes or physical runtime; PR #528/#475 untouched.