research(track-a): resolve chat inbound static dispatch

[blakinio]

Terminal disposition

Researcher source for OTC-20260818-track-a-s6-chat-inbound-static.

Coordinator accepted the bounded result and promoted it via PR #527, squash merge 066a5ba8b1811ef61d3aa8ac2ff3fc3601fe7b9d.

Canonical promoted result:

TProtocolMessageQueue
  21  receivedTalkMessage
  23  receivedMessageMessage
  54  receivedOpenChannelMessage
  85  receivedChannelsMessage
  86  receivedPrivateChannelMessage
  89  receivedOpenOwnChannelMessage
  90  receivedCloseChannelMessage
  115 receivedChannelEventMessage
  188 receivedNpcTalkPartersMessage

TChatProtocolMessageHandler
  QMeta 0x30877c0 / qt_static_metacall 0xd05f20
  13 methods / 2 signals
  handle*Message = indices 2..10

TChatChannelStorage
  QMeta 0x3087900 / qt_static_metacall 0xd05c50
  6 methods / 5 signals

S1 also proves exact registerServerMessage<T> member-pointer type contracts for the nine corresponding protobuf message types.

Still intentionally unpromoted:

registered member pointer == suffix-matching received signal: high inference only
queue signal -> chat handler: UNKNOWN
chat handler -> channel storage mutation: UNKNOWN
runtime chat delivery: NOT_OBSERVED

Source final head 7cec8d37907448e7bd025864628de9f8858781a4 was green: CI 32127738468, governance 32127738121, reviews/threads 0/0, and 0-behind at source finalization.

No new client bytes, physical runtime, Synology/X11/process memory, credentials, login or gameplay were used. PR #475 remained untouched. Source Draft is intentionally closed unmerged after coordinator promotion.