docs(track-a): promote P2 persistent-buffer downstream evidence

[blakinio]

Coordinator integration for OTC-20260815-track-a-p2-buffer-downstream-consumer.

Decision: ACCEPT_WITH_EDITS
Base: exact main@8c9486e2c6109a7a39b564804c8acd707659b5e0
Execution: GitHub/docs only; runtime_access: none; physical E2E: false.

Final integration scope

Exactly five durable files are changed:

• accepted evidence report + JSON manifest for the research(track-a): trace retained byte-container consumer #310 downstream chain;
• P2-NETWORK coordinator barrier refresh;
• archive record for consumer OTC-20260815-track-a-p2-buffer-downstream-consumer;
• archive record for one-shot producer OTC-20260817-track-a-p2-clientprocessor-sanitized-evidence.

No workflow/script from source #310 or producer #449 is promoted.

Independent evidence boundary

• accepted research(track-a): trace post-serialization buffer boundary #308 exact persistent-QBuffer boundary;
• original non-quarantined research(track-a): trace retained byte-container consumer #310 artifact 9252025461 for local processor observations;
• research(track-a): stage missing P2 ClientMessageProcessor identity evidence #449 evidence run 32005141186, source artifact 9279753620 and hosted artifact 9279759553;
• coordinator independently re-decoded the bounded source bytes instead of trusting generated result.json;
• current-main canonical owner +0xc18/+0xc20 = TGameserverDualConnection typing.

Accepted:

• persistent QBuffer -> TProtocolClientMessageProcessor this+0x18: PROVEN;
• first recovered downstream consumer TProtocolClientMessageProcessor+0x10@0xc2df80: PROVEN;
• first recovered downstream transform TGameserverNetworkPacketRawDataProcessor+0x10@0xb47130: PROVEN;
• same-message handoff to TGameserverDualConnection +0x80/+0x78: PROVEN;
• protocol stage order: PROVEN_PARTIAL.

Remain UNKNOWN: framing, sequence, compression, encryption, final binary egress, final socket ownership, complete transport ordering beyond the recovered processor chain.

Source PR lifecycle

• research(track-a): trace retained byte-container consumer #310 = closed unmerged, ACCEPT_WITH_EDITS, terminal comment 5313140452;
• research(track-a): stage missing P2 ClientMessageProcessor identity evidence #449 = closed unmerged, ACCEPT, terminal comment 5313150277;
• research(track-a): stage missing P2 ClientMessageProcessor identity evidence #449 final task-only head dbd75c152957ae945804f81313f485430b6cb768: Track A governance 32006193081 = SUCCESS, CI 32006193202 = SUCCESS;
• custom producer workflow ran exactly once (32005141186); no evidence rerun occurred during closeout.

Audit / E2E

Fresh coordinator audit: PASS_BOUNDED, material findings open: 0. Findings TACOORD-310-20260817-001/-002 are closed.

E2E: NOT_APPLICABLE — static reverse-engineering/evidence integration only; no runtime behavior, client process or transport state changed.

P2 barrier is refreshed in docs/agents/evidence/OTC-20260816-track-a-promotion-coordination/20260817-p2-network-barrier-update.md; it supersedes the stale P2 BLOCKED_INPUT_STAGING checkpoint only and deliberately does not reclassify other lanes.

Final exact promotion head: 3abddc33ca4e6d7bf56a0e324c25e43782393530. Merge only after required exact-head/ready-state CI and review hygiene pass.

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