docs(track-a): promote P2 outbound framing

[blakinio]

Coordinator promotion for Draft researcher #493 / OTC-20260817-track-a-p2-f50090-framing.

Decision: ACCEPT_WITH_EDITS.
Trusted base: main@c1adcf491580e28d40f215356a9e559af2ccadc4.
Source final head: 6d01a7eb22548256e0d4f5aff9a6d13f95f84c19.

Independent review re-read the exact hosted 0xf50090 disassembly from run 32037533068 / job 95410901806, the accepted hosted RawDataProcessor evidence from run 32005141186, and current-main PR #492 QTcpSocket provenance.

Promoted result:

DUALCONNECTION_TO_BINARY_EGRESS=PROVEN
FINAL_BINARY_EGRESS=PROVEN_AT_QT_QTCPSOCKET_BOUNDARY
FINAL_SOCKET_OWNER=FACT:TGameserverTCPConnection
FINAL_OS_SOCKET_SYSCALL=UNKNOWN
FRAMING=PROVEN
SEQUENCE=UNKNOWN
COMPRESSION=UNKNOWN
ENCRYPTION=UNKNOWN

Exact framing evidence at 0xf50090: deterministic scalar source low16(ceil(nonnegative payload_length/8)), then DWORD(message+0) with semantic identity deliberately UNKNOWN, then the canonical raw payload pointer/length into QDataStream::writeRawData@0x4dd250. PR #492 independently binds that writer/QDataStream to the concrete TGameserverTCPConnection-owned QTcpSocket.

RawDataProcessor additionally proves a zero-prefix/alignment envelope and a conditional member-object transform when message+0x28 == 2, but this promotion does not call that transform encryption or compression.

Source exact-head validation: Track A governance 32042849047 = SUCCESS; CI 32042849245 = SUCCESS after one infrastructure-only retry for dorny/paths-filter HTTP 429/502/429; CI / Required 95429351299 = SUCCESS; changed files 3; reviews/threads 0/0.

This PR contains only coordinator evidence and the archived researcher task. E2E NOT_APPLICABLE — static exact-file/disassembly evidence only.

Next frontier after merge: exact producer/update provenance of DWORD(message+0) at f50107, specifically to prove or disprove sequence semantics.