docs: step-3 rewrites — OQ-39/40 resolved, C-08 closed, channel-operations.md put/control/resources contracts, review 010/011 closed with the S-01 sketch corrected

- open-questions.md: OQ-39 → ADR-052, OQ-40 → ADR-053 (resolutions replace
  the deferred-until-needed posture)
- channel-operations.md: the put contract (initiator allocates + streams,
  reserved input key, one response, acks-in-result sentence), the control
  routing (ADR-052), the enumerator aggregation (ADR-053), the
  connection-owner paragraph's pub-era correction, the ADR table rows
- ADR-051 §6: PubTypedOpen → the put translation; ADR-047's 2026-09-06
  amendment records its era honestly (the dynamic half is now ADR-053)
- review 010: all four findings resolved (with the S-01 sketch correction
  so the published record stops carrying the wrong-graph reading)
- review 011: closed (all seven pins implemented + gates landed)
- review 001 C-08: resolved note (odd/even + adopt, implemented)
- AGENTS.md: the 'Stub Guard' section — the not_implemented grep is part
  of cargo test; the registration invariants and the implement-or-stop
  ruling are release-blocking

Verified: cargo test (696+guard), clippy -D warnings, fmt, doc clean.

docs/architecture/README.md

@@ -13,7 +13,7 @@ This crate unifies `alknet-call` and `alknet-channels` from the alknet
 mono-repo, plus the vendored core types formerly in `alknet-core`. The
 source architecture docs were ported from
 `/workspace/@alkdev/alknet/docs/architecture/` and renumbered as alkcall
-ADRs (ADR-001..051). The ALPN strings (`alk/call`, `alk/channels`)
+ADRs (ADR-001..053). The ALPN strings (`alk/call`, `alk/channels`)
 are wire-stable and unchanged — see ADR-004.
 
 ## Documents
@@ -104,6 +104,8 @@ are wire-stable and unchanged — see ADR-004.
 | [049](decisions/049-channel-open-establishment-phase.md) | Channel-Open Establishment Phase | `OpenEstablisher` + `register_openable_with_establisher` (awaited, bounded); typed `channel:open_failed` with `details.reason`; `Establishment.plan` (`ChannelPlan`) threaded to the `OpenHandler` (amendment 2); the `JoinHandle` data-plane lifetime contract |
 | [050](decisions/050-pump-bidi-two-pump-helper.md) | `pump_bidi` Two-Pump Helper | `channels::pump_bidi` — shutdown-on-completion two-pump data plane pinned in one place (alknet ADR-078) |
 | [051](decisions/051-channel-relay-and-hub-leg.md) | In-Tree Channel Relay (`ChannelRelay`) and the Hub-Leg Assembly | ADR-042 amended — the relay implementation is an alkcall export; translate hop = ADR-049 establisher (`register_relay_openable`), byte-forward hop = `pump_bidi`; implicit per-channel id mapping; two-phase registration (discover/stash → fork-register); hub-leg install template; ACL layering note |
+| [052](decisions/052-channel-control-surface.md) | `channel/control` Control-Handle Surface | Establisher-contributed `ChannelControl` (`Establishment::with_control`), wrapper-installed/teardown-removed in the manager; `channel:no_control_handle` capability answer; resolves OQ-39 |
+| [053](decisions/053-resource-enumerators.md) | Live Resource Enumerators | `ResourceEnumerators` (peer-shared registry); snapshot-then-changes enumerator contract; scan-once aggregation; empty seed; resolves OQ-40 |
 
 ## Relevant Open Questions