Prune the channels spec to reflect the stream-unification resolution (docs/research/stream-unification/findings.md): the channels wire format goes from 9 bytes to 8 bytes, the channels layer no longer carries a stream_type concept, into_sub_streams() is removed, and TTY always uses its 5-byte format (carried transparently in the channels payload). ADR-093 is the umbrella decision (the channels-layer consequence of ADR-092's BiStream handler leaf): every channel is a BiStream, the handler owns its sub-stream multiplexing, the channels layer routes by channel_id only. Amends ADR-071 (8-byte header, no stream_type), ADR-074 (into_sub_streams removed, accept_bi yields BiStream), reverses ADR-077 (TTY always 5-byte), and the channels-facing clauses of ADR-072/073/075/076/080/081. Adds ADR-092 forward-reference note (into_sub_streams preservation subsequently reversed by ADR-093) and the missing ADR-092 cross-reference on ADR-070. Adds OQ-68 (add/strip API shape — built-in vs utility; the contract is decided in ADR-093, the function surface is open; two-way door, low priority, decision-ready when the channels crate's implementation begins). Rewrites the 7 channels spec docs (README, overview, channels-wire, channels-connection, channels-adapter, channel-operations, channel-client) to describe the post-amendment shape as current, with the 8-byte header, the add/strip composition, single accept_bi accessor, BiStream per channel, and TTY-always-5-byte. Touch-up cross-references in hub README, client README, ADR-085, and the OQ-45/47/65 question files (TTY-internal stream_type 3 → STREAM_CTRL_IN; channels 9-byte → 8-byte).
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OQ-47: Stdin Closure Canonical Signal
- Origin:
docs/research/alknet-docker/poc-summary.md§"Open Unknowns" #4 (stdin closure semantics for raw carriage); crates/tty/tty-wire.md §"Stdin Closure". - Status: resolved
- Door type: Two-way
- Priority: low
- Resolution: Either a zero-length stdin chunk (stream_type 0,
length 0 — the docker POC's sentinel) or a
{"type":"eof"}control chunk (TTY'sSTREAM_CTRL_IN, stream_type 3 — the tty POC's explicit signal) closes the client's stdin. Both are accepted by the adapter; the spec recommendseoffor explicitness (it's a control message, not a data-length hack). The adapter handles both identically: signal EOF to the backend's stdin (ChildStdin::drop/ PTY writer close) and keep pumping stdout until the exit resolves — the client may still want to receive remaining output + the exit code. A third path (client closes the write half of the bidi stream) is also accepted and handled the same way. See ADR-052 andtty-wire.md. - Cross-references: ADR-052, tty-wire.md, tty-adapter.md