docs: rank control-plane slice after #535; honest README

[iamfatness]

Owner ranking for the 2026-09-24 architecture review at 6f4f025.

BACKLOG

• Now stays #535 (source-bus adapter lifecycle).
• Next is now:
  1. Command contract is not authoritative: production sync emits dispatcher no-ops; unknown batch members are dropped #616 wire honesty (ride Program shared-texture events ride the throttled preview queue; dedicated drain is empty #619 + High-priority stdout response queue is unbounded; a wedged shell can stall the writer #620)
  2. Capability handshake advertises compile flags, not the constructed runtime #617 constructed capabilities
  3. CI Windows job compiles the stub core; production D3D11/MF/WASAPI adapters can merge unbuilt #618 Windows production-native CI compile lane
  4. Single-slot sync plus UI-thread snapshot apply can drop a fire-and-forget command #622 single-slot sync
  5. Three snapshot truths: typed operator snapshot, redacted qualification JSON, and ControlState drift independently #621 one observation model
  6. Core edge I/O: receive and send SRT, NDI, RTMP, HLS as adapters #538 SRT/NDI
  7. SRT ingest decoder: packets must become VideoFrame pixels + PCM on the source bus #536 SRT ingest
  8. [T0.1] Buy the code-signing certificate (Authenticode / Trusted Signing) #423 signing
  9. [T5.3] A clip entering Program cold-starts with a placeholder flash (hand the warmed cue decoder to Program) #449 cold Take
• Live incidents RTMP streaming amplifies packet traffic; investigate PC-wide connectivity loss #615, Audio drops out for remaining participants when others disconnect; selecting their source restores it #608, Recover a subscribed Zoom video feed that stops advancing in Tiles #624, H.264 10 Mbps YouTube stream coincides with ~20-second operator stall #597 stay unranked and may preempt on a show night.
• Trimmed the F1: one source bus — every adapter must publish real VideoFrame pixels + PCM #535 Now cell; evidence stays on the issue.

README

As-built only (not a second queue):

• Points work order at docs/BACKLOG.md.
• States the command contract and capability handshake honestly (Command contract is not authoritative: production sync emits dispatcher no-ops; unknown batch members are dropped #616, Capability handshake advertises compile flags, not the constructed runtime #617).
• States that Windows merge CI compiles the stub core (CI Windows job compiles the stub core; production D3D11/MF/WASAPI adapters can merge unbuilt #618).
• DeckLink/AJA marked probe-only (DeckLink/AJA: live frames on the source bus (not probe-only) #537).
• Short current-priority pointer dated 2026-09-24.

Does not start implementation.

[iamfatness]

Prioritization play is on #616 (comment).

Short version for merge of this docs PR: keep #616–#622 unranked. Do not move them to Now. If promoted, the recommended Next order is #616+(#619,#620) → #617 → #618 → #622 → #621, after #535, without displacing #538.