docs: re-key architecture docs off the alknet mono-repo — speak as alkcall

The ported docs still framed alknet siblings (alknet-core/-call/-channels/
-http/-tls/-client) as live load-bearing context of this crate. With the
extraction complete and alknet headed for glue-level replacement, the docs
now speak as alkcall and cite the real sibling crates (alkhttp, alktls,
alktty, alktunnels, alktrader).

- ADR-054 (new): re-own the verifier-selection rule in-crate — three
  remote roles (public X.509 endpoint / transport relay / hub),
  ServerCertVerifier by PeerEntry presence, RemoteIdentity None
  load-bearing. Provenance: alknet ADR-034 (never ported), demoted to
  footnote. Resolves OQ-21's cross-repo authority gap.
- OQ-43 (new, deferred(scope)): composition-layer ownership and shape
  after the alknet replacement — the named receiver for the
  downstream-side deferrals (OQ-33 endpoint layer, OQ-41 QUIC-native
  substrate, OQ-42 hub broker, OQ-19 persistence adapters, ADR-045 dial
  seam). README layering diagram redrawn with the composition layer as
  TBD-ownership instead of "alknet / alknode" in concrete.
- Spec docs reframed: titles, self-references, dial/TLS/from_jsonschema
  homes, malformed legacy cite rows removed; dead relative research
  paths qualified as source-repo paths.
- ADR amendments (append-only): 027 (alknet-http -> alkhttp), 031 (post-
  extraction state), 044 (split landed as modules in alkcall), 045
  (name normalization; citation-space note).
- Citation hygiene: unprefixed/colliding source-repo cites prefixed
  ("alknet ADR-NNN (provenance)") across 009/011/022/034/035/038/040/
  043/044/045; stale OQ cites corrected (session registries OQ-04, batch
  semantics OQ-03, verifier rule ADR-054); stale anchors fixed.
- README provenance note consolidated; citation conventions documented.

Verification: markdown link check (all local links resolve, all in-crate
ADR cites point at existing decisions/ files); table integrity check
(uniform row widths across open-questions.md and edited tables); residual
alknet-mention sweep (only provenance/historical/intentional framing
remains); architecture review subagent pass with zero remaining criticals.
Docs-only change — no code paths touched.

docs/architecture/decisions/040-backpressure-channel-limits-id-reuse.md

@@ -109,7 +109,7 @@ per `ChannelManager` (`buffer_cap` field). This prevents memory exhaustion
 without the complexity of SSH's sliding-window protocol.
 
 Full channel-level windowing (SSH-style sliding-window per channel) is a
-deferred extension, tracked as [OQ-56](/workspace/@alkdev/alknet/docs/architecture/questions/056-full-channel-level-flow-control-windowing.md)
+deferred extension, tracked as [alknet OQ-56](/workspace/@alkdev/alknet/docs/architecture/questions/056-full-channel-level-flow-control-windowing.md)
 (deferred(scope)). It is blocked on a real deployment observing head-of-
 line blocking where the bounded-buffer mitigation is insufficient. The
 bounded-buffer decision is made; the extension is not.
@@ -201,7 +201,7 @@ DoS defense summary.
 - Bounded-buffer backpressure does not eliminate head-of-line blocking — it
   bounds the memory cost. A slow consumer still stalls its own channel's
   demux reads. For the intended use cases (TTY, SSH, tunnels) this is
-  acceptable; full windowing is tracked as OQ-56 (deferred(scope)).
+  acceptable; full windowing is tracked as alknet OQ-56 (source-repo space, provenance; in-crate: OQ-23) (deferred(scope)).
 
 ## Door type