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Ack map: record Q-A1 and Q-A2, one meaning for Acknowledged

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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Meta Vens 2026-09-29 21:29:59 +02:00
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docs/cultnet-rudp-ack-cut.md
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# CultNet RUDP: a frame is Received, then Delivered, and the receiver owns ordered delivery with one watermark
# CultNet RUDP: Acknowledged means delivered, and the receiver owns ordered delivery with one watermark
Status: cut map, Imagination pass 1, 2026-09-30. It is not committed yet. Self
commits it to `main` as `docs/cultnet-rudp-ack-cut.md`. The ends are the operator
ruling of 2026-09-30, summarised below. This document owns the means.
Status: cut map, Imagination pass 1, 2026-09-30, committed by Self.
**Rulings (operator, 2026-09-30).** These supersede the two-state proposal in the text below. Cuts 4 and 5
need re-mapping to them before Hands.
- **Q-A1 (a):** Delivered is derived at the sender from a correct receiver's cumulative watermark. The wire
does not change.
- **Q-A2:** "I think this is telling us we don't actually need both received and delivered."
- There is one public meaning: Acknowledged means delivered.
- Receipts go Pending, then Acknowledged (delivered), or Invalidated. No public Received state exists.
- Retransmission still stops on each packet's own ack, so resending stays bounded.
- Flush waits for Acknowledged.
- **Open:** Q-A3 (expiring reliable traffic next to ordered traffic), Q-A4 (porting receipts), Q-A5 (Kotlin).
- **Added to Cut 1's scope** (from stray-packet Soul pass 3, pre-existing): a restarted client on the same
endpoint and payload is locked out by repeated-Connect answers. A reconnect on the same transport treats a new
server session's frames as duplicates. Session generation belongs to the sequence space this cut owns.
- **Body.** `origin/hands/rudp-stray-packets` at `d85877a7` ("the session no
longer keeps an initial sequence nothing reads"). Every `file:line` is against