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

[blakinio]

Coordinator promotion/closeout for researcher Draft #518 / OTC-20260818-track-a-s5-container-inbound-static.

Decision: ACCEPT_BOUNDED_PARTIAL.
Source final head: 9604ba9ab63a6a8017adc712ce4b3a0d1519521d.
Trusted promotion base: main@5afdfbde6c6e5b5bb8defe6c3eb2e36d3469bd0e.

Promoted exact QMeta boundaries:

TProtocolMessageQueue
  62 receivedContainerMessage
  64 receivedCreateInContainerMessage
  65 receivedChangeInContainerMessage
  66 receivedDeleteInContainerMessage

TContainerProtocolMessageHandler
  14 handleContainerMessage
  18 handleCreateInContainerMessage
  16 handleChangeInContainerMessage
  17 handleDeleteInContainerMessage

TContainerStorage
  containerUpdated
  containerRemoved
  manualSortModeChanged

S1 exact type information additionally proves TProtocolMessageQueue::registerServerMessage<T> member-pointer type contracts for all four corresponding GameserverMessage* protobuf types.

Still deliberately unpromoted:

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

S5 reused sanitized exact-build evidence only. Producer 32122620894 / 95666177103, artifact 9319111338; source final CI/governance green and branch 0-behind. No new client bytes or physical runtime; PR #475 untouched.