New open question capturing the doors-as-family-infrastructure
direction: alkssh (planned) becomes the ssh door for git, git is a
payload service exposed by downstream doors (alkhttp, alkssh, alknet),
and the crate set may slim to protocol crates + http adapter (kept in
alkgit, Slim-A, or promoted to an alkhttp git feature, Slim-B).
OQ-09 carries the three sub-decisions (alkgit-ssh deletion vs
temporary russh scaffolding; http adapter home; alkgitd consumption
path) and cross-references ADR-006 (now flagged as possibly superseded
before finalization) and OQ-01. Deferred summary table updated.