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+# Review 003 — WebSocket data-channel wiring gap (the OQ-05 drill-down)
+
+## Status
+
+Verified, open for remediation.
+
+## Scope
+
+Focused review of the deferred half of the WS path: the data-channel
+wiring recorded as OQ-05 (review-001 WS-03, deferred 2026-08-29), plus
+the bidirectionality half of ADR-048 it leans on. The trigger for this
+pass was a session-level drill-down into
+[websocket.md](../architecture/websocket.md) §"Data channels for
+browsers" and the OQ-05 deferral: what exactly is missing, whether the
+deferral rationale still holds, and whether the "nothing new to
+design" assumption recorded in OQ-05 is actually true.
+
+The pass covered:
+
+- the WS accept-side wiring end to end (`src/websocket/upgrade.rs`,
+  the alkcall `ChannelsAdapter` accept path it drives),
+- the alkcall channel machinery the deferred wiring is expected to
+  reuse (`ChannelCore::register_openable`, `ChannelOperations`,
+  `ChannelManager` open/adopt/ledger, the demux loop), including
+  alkcall's own end-to-end test of the exact wiring shape,
+- the dispatch path that would resolve an open op on channel 0
+  (`Dispatcher::dispatch` / `run_loop_single_stream`,
+  `compose_root_env`, the connection overlay),
+- the deployment surface (`HttpAdapter` builders, `SessionState`,
+  `RouterState`) an openable-ALPN declaration would ride,
+- the spec record (ADR-047 §4 amendment, ADR-067 v1-cut note,
+  ADR-048 reconciliation note, OQ-05, alkcall ADR-047 §6 discovery
+  split), and
+- the consumer framing (OQ-05's "reopened when a browser consumer
+  lands" trigger) against the clarified product position: WS is the
+  browser path **and** the native-client fallback behind hostile
+  NAT/firewall — the consumer set is wider than browsers, and the
+  wasm-capable protocol stack means a browser client needs only
+  binary-frame parsing and byte reassembly before handing bytes to
+  alkcall-wasm.
+
+Cross-crate findings (alkcall-side) are flagged as such. Findings
+continue review-002's numbering (WS-20..).
+
+## Baseline verification (this pass)
+
+```
+cargo test                                      → 453 passed, 0 failed
+cargo test --all-features                       → 575 passed, 0 failed
+cargo clippy --all-targets -- -D warnings       → clean
+cargo clippy --all-features --all-targets -- -D warnings → clean
+cargo fmt --check                               → clean
+```
+
+Verified against tree `58665f2`. No source changes were made in this
+pass; the findings are analysis-verified against source (file:line
+below) rather than introduced by new code.
+
+## Verdict
+
+- **OQ-05's core assumption is now known to be wrong, and that is the
+  headline.** OQ-05 records the deferral as *"the design is decided
+  (ADR-067: the browser opens data channels exactly as any channels
+  consumer — nothing new to design); what is deferred is the
+  wiring."* That held for the alkcall-side machinery — which is
+  genuinely complete and well tested — but two wiring-blockers turned
+  out to be **design gaps, not mechanical work**:
+  - **WS-24 (cross-crate):** the ADR-047 §4 amendment's registration
+    mechanism ("`register_openable` is called on the connection's
+    overlay registry, Layer 2") cannot resolve an open op on the
+    wire — the top-level dispatch consults only the dispatcher's base
+    registry and never the connection overlay. The only shape proven
+    to work (alkcall's own e2e test) registers open ops on a
+    per-connection registry installed **as the dispatcher's base
+    registry** — a shape the ADR does not describe and that has no
+    fork/clone surface on `OperationRegistry` to support.
+  - **WS-25:** there is no wire mechanism for a WS client to
+    register an op at all — the call protocol's envelope kinds are
+    `call.requested`/`responded`/`completed`/`aborted`/`published`/
+    `error` only. ADR-048's browser-side bidirectionality ("the hub
+    can call browser-registered ops") is not designable until
+    alkcall defines client-side op registration (or amends the
+    promise). Every overlay test to date pokes
+    `register_imported` in-process.
+- **The mechanical half of the gap is real but small** (WS-20/21/22):
+  the accept-side hook discards the `ChannelManager` alkcall hands
+  it, the generic channel lifecycle ops are never registered, and no
+  deployment surface exists to declare openable ALPNs. The alkcall
+  machinery these would consume (`ChannelCore`, `ChannelOperations`,
+  opener ledger, demux, odd/even id split, cap policy) is built,
+  tested, and ready — alkcall even ships an end-to-end test of the
+  exact wiring over duplex.
+- **The deferral trigger no longer matches the consumer set.** OQ-05
+  says "reopened when a browser consumer lands," but WS is also the
+  native fallback behind ugly NAT/firewall; a Rust WS consumer
+  (exactly the `test_support` client shape) is a legitimate first
+  consumer and needs no JS library — OQ-04 does not block this
+  wiring (WS-23).
+- No regressions and no new robustness holes were found in the
+  channel-0 path itself; the WS-13/17/18-era pump work is sound and
+  the idle-knob/data-channel interplay (silent-but-alive SSH-style
+  channels) is already documented with a deployment posture.
+
+## Severity legend
+
+- **[critical]** — the protocol cannot function end-to-end as
+  committed; or a decided spec invariant is violated in a way that
+  corrupts data or causes silent permanent state damage.
+- **[major]** — a decided behavior is missing, wrong, or a real
+  reliability hazard; works in the happy path but fails a
+  spec-required edge case, or is a realistic security weakness.
+- **[minor]** — drift, convention violation, dead code, or a
+  doc/spec inconsistency with no correctness impact.
+
+---
+
+# Part A — The deferred wiring (mechanical)
+
+## WS-20 [major] — `install_channel_zero` discards the `ChannelManager`; no `ChannelCore`, no open ops, ever
+
+**Residual of:** review-001 WS-03 / OQ-05 (the v1 cut itself).
+**Verified:** YES. The hook alkhttp supplies to
+`ChannelsAdapter::new` ignores the manager:
+`Arc::new(move |_manager, channel0_conn, auth| ...)` —
+`src/websocket/upgrade.rs:255`. alkcall's accept path passes the
+per-connection `ChannelManager` precisely so the hook can build a
+`ChannelCore` and register openable ALPNs on it
+(`alkcall/src/channels/adapter.rs:268` —
+`(self.install_channel_zero)(manager.clone(), channel0_conn, auth.clone())`;
+the `InstallChannelZero` doc at `adapter.rs:50-54` says the manager is
+reachable via the hook "e.g., to register channel lifecycle ops'
+`ChannelCore`"). The reference wiring exists in alkcall's e2e test
+(`channels/client.rs:780-837`): the hook builds
+`ChannelCore::new(manager, policy)`, registers a per-ALPN open op via
+`register_openable`, and dispatches channel 0 with it. In alkhttp the
+manager is dropped on the floor, so a browser/native WS client can
+never open a data channel — the capability ADR-067 says the channels
+design exists to provide, and the only part of the WS path the HTTP
+gateway cannot already do.
+
+**Fix (Unit 2):** rework the hook to take the manager, build the
+per-connection `ChannelCore`, register the generic ops (WS-21) and the
+deployment's openable ALPNs (WS-22), then run the dispatcher over the
+per-session registry — shape per the WS-24 decision. The policy is
+already threaded (`ChannelsPolicy` extension, review-001 SRV-10's fix);
+the openables ride the same path.
+
+## WS-21 [major] — Generic channel lifecycle ops are never registered: no `channel/close`, `channel/control`, `channel/resources/subscribe` on WS sessions
+
+**Verified:** YES. alkcall's `ChannelOperations::register_on`
+(`alkcall/src/channels/operations.rs:42-98`) registers the three
+generic ops — close (with drain-before-close + opener-ledger
+decrement), control (loud `not_implemented` per alkcall OQ-39), and
+resources/subscribe (loud `not_implemented` per alkcall OQ-40).
+Grep-verified: nothing in alkhttp calls it, and the per-session hook
+(WS-20) never registers them. Consequence: even if open ops were
+wired today, a WS client could not close a channel
+(`channel/close` → `NOT_FOUND`) or observe resources — the open
+ledger would only drain via connection teardown. This is also the
+discovery seam for the dynamic half of alkcall ADR-047 §6's
+discovery split.
+
+**Fix:** fold into the WS-20 hook rework — `register_on` on the
+per-session registry next to the openables. Note the
+`not_implemented` ops are correctly loud today; registering them is
+still right (fail loudly at the op, not `NOT_FOUND` at discovery).
+
+## WS-22 [major] — No deployment surface to declare openable ALPNs for the WS path
+
+**Verified:** YES. The `HttpAdapter` builder surface is
+`with_decoy` / `with_extra_routes` / `with_ws_max_sessions` /
+`with_ws_idle_timeout` (`src/server/adapter.rs:158-233`) — nothing
+expresses "these ALPNs are openable on WS sessions." `SessionState`
+carries registry/sessions/slots/idle only (`upgrade.rs:89-97`), and
+`RouterState` likewise. The deployment decision ADR-067 requires
+("the deployment decides which ALPNs are openable — the browser
+reaches exactly what a Rust consumer on an in-line connection would
+reach") has no expression point. Note the distinction from the
+existing `ChannelsPolicy` extension: that is the *cap* policy
+(`ChannelLifecyclePolicy::check_open`); the *openable set* (per-ALPN
+`OperationSpec` with the `channel_open` marker + `OpenHandler`) is a
+separate, currently nonexistent input.
+
+**Fix (Unit 2):** an `OpenableAlpn { spec, open_handler }` list +
+`HttpAdapter::with_ws_openable_alpns(...)`, threaded
+`RouterState` → `SessionState` → `run_channels_session` → hook, with
+a request-extension fallback mirroring `ChannelsPolicy` so
+bare-registry/custom upgrade routes can pass their own set. The
+ALPN-specific `OpenHandler` implementations stay in the ALPN crates
+(alktty et al.); alkhttp only ferries the registrations.
+
+## WS-23 [minor] — No browser-opened-channel e2e test; OQ-05's reopen trigger underestimates the consumer set
+
+**Verified:** YES. The test suite covers channel-0 dispatch
+(`tests/ws_*`), overlay mechanics (in-process pokes,
+`tests/ws_overlay_ops.rs`), and pump robustness — but no test opens a
+data channel through a live WS session (the OQ-05 acceptance item
+"browser-opened-channel end-to-end test" exists precisely because
+none does). Everything needed already ships behind
+`test-support`: `WsClient`, `frame_channel0_chunk`,
+`ChunkAssembler`, `FrameAssembler` (`src/websocket/upgrade.rs:444-709`)
+— a Rust WS client speaking raw channels framing, which is also
+exactly the shape of the native-client-behind-a-firewall consumer.
+alkcall has the analogous e2e test over duplex
+(`channels/client.rs:767-870`) — the alkhttp one is the missing gate.
+
+**Also record here (product framing, no code change):** OQ-05's
+status — `deferred(scope: v1 cut — no browser consumer yet; reopened
+when one lands)` — frames the consumer as a browser needing the JS/TS
+library (OQ-04). The clarified position: WS is the bidirectional path
+for browsers **and** the fallback for native clients behind hostile
+NAT/firewall/proxy; a native WS consumer is feasible today with zero
+new library work (Rust client, same framing as any in-line
+transport), and a browser consumer is mostly byte parsing +
+reassembly ahead of wasm-targeted alkcall (WebTransport remains out
+of scope per ADR-069). The wiring is therefore not blocked on OQ-04,
+and the reopen trigger should be reframed accordingly when OQ-05 is
+picked up.
+
+**Fix:** the Unit-3 e2e test (open → `{channel_id}` → chunks both
+ways → handler sees bytes → `channel/close` → cap denial → teardown
+decrements), plus the OQ-05 reframe when the task lands.
+
+---
+
+# Part B — Design/spec mismatches (planning bugs; need decisions before wiring)
+
+## WS-24 [major, cross-crate] — Top-level dispatch never consults the connection overlay; the ADR-047 §4 amendment mechanism cannot resolve open ops on the wire
+
+**Verified:** YES. The amendment
+(`alkcall/docs/architecture/decisions/047-openable-alpns-are-operations.md`,
+"Amendment (§4 per-connection registration, 2026-08-13)") decides:
+*"open ops are registered per-connection … `register_openable` is
+called on the connection overlay registry (Layer 2 per ADR-019),
+closing over a per-connection `ChannelCore`."* But the dispatcher's
+top-level resolution never looks at that layer:
+`Dispatcher::dispatch` reads the op's type from
+`self.registry.registration(...)` (`dispatch.rs:316-320`) and invokes
+via `self.registry.invoke/invoke_streaming/invoke_sink`
+(`dispatch.rs:330-341`) — the base registry only. The connection
+overlay (`CallConnection::overlay_env()`,
+`connection.rs:174`; `OverlayOperationEnv`) is reachable solely as a
+layer of `context.env` via `compose_root_env`
+(`dispatch.rs:195-215`) — i.e., for *nested* invocation by handlers,
+not for resolving the incoming `call.requested` itself. An open op
+registered per the amendment's mechanism would resolve `NOT_FOUND`
+on the wire.
+
+The only shape proven to work is alkcall's own e2e test
+(`channels/client.rs:767-870`): the hook builds a **fresh
+per-connection registry containing the open op and passes it as the
+dispatcher's base registry** (`Dispatcher::new(registry, ...)` at
+`:837`). That shape works but implies a per-session fork of the
+deployment's base registry (base ops + generic channel ops +
+openables) — and `OperationRegistry`/`HandlerRegistration` have no
+`Clone`/fork surface (registration.rs:68-75, 97-100; the inner
+payloads `OperationSpec`/`HandlerKind` do derive `Clone`), so the
+fork needs an alkcall-side addition or a re-registration walk. It
+also implies per-session re-registration of `services/list` /
+`services/schema` closed over the fork, or per-session open ops stay
+undiscoverable (alkcall ADR-047 §6's "what may I open" half).
+
+This is the "planning bug": OQ-05 says *nothing new to design*;
+mechanically the alkcall machinery is done, but the registration
+*mechanism* the ADR names does not dispatch. Either resolution is
+fine — the decision just needs to be made deliberately:
+
+- **(a)** per-session base registry (the proven shape): alkcall
+  amends ADR-047 §4's mechanism wording and adds a fork/clone
+  surface on `OperationRegistry` (most registration payloads already
+  `Clone`); alkhttp builds the per-session fork in the hook. No
+  dispatch-path change; discovery re-registered per session.
+- **(b)** overlay-aware top-level dispatch: alkcall adds an overlay
+  fallback in `dispatch`/`run_loop_single_stream` (consult
+  `connection.overlay_env()` when the base registry misses). Larger
+  blast radius (touches the shared dispatch loop); keeps one static
+  registry; makes the ADR-047 amendment's wording true as written.
+
+Cross-crate: the decision and (for (a)) the fork surface live in
+alkcall; alkhttp consumes whichever lands.
+
+## WS-25 [major] — No wire mechanism for a WS client to register an op; ADR-048's browser-side bidirectionality is undesignable as specified
+
+**Verified:** YES. The call protocol's envelope kinds are
+`call.requested` / `call.responded` / `call.completed` /
+`call.aborted` / `call.published` / `call.error`
+(`alkcall/src/protocol/wire.rs:12-17`) — there is no
+registration/announce kind, and grep-verified no wire op by which a
+client could register a handler spec. Client-side registration
+onto an overlay (`register_imported` / `register_imported_all`,
+`connection.rs:162-172`) is reached only in-process — the
+`from_call`/`from_wss` import path (a Rust consumer importing a
+remote peer's ops) and tests. Every "browser-registered op" test
+pokes the overlay directly in-process
+(`tests/ws_overlay_ops.rs:210-251`; the alknet-http `overlay.rs`
+prior art is the same shape). So the decided behavior — *the hub can
+call browser-registered ops over the same session*
+(websocket.md §"Bidirectionality"; ADR-048's reconciliation note
+records it as decided design, deferred) — has no wire contract for
+the browser half: nothing tells the hub the op exists, and the
+browser cannot run a Rust-side `import()`.
+
+This is an alkcall-level protocol design gap (a new envelope kind /
+handshake, an explicit "not supported for WS-native clients" scope
+cut, or a channel-0 bootstrap op). It does **not** block the
+data-channel half (open ops are hub-registered; the browser only
+calls them), which is why Unit 1 can decide WS-24 first and WS-25 in
+parallel — but ADR-048's promise should not be treated as
+implementable by wiring alone.
+
+## WS-26 [major] — The upgrade path retains no live connection handle; the hub cannot reach a session's overlay even once registration exists (and cannot push anything, ever)
+
+**Verified:** YES. `run_channels_session` hands channel 0's
+`Connection` into the hook, which moves it into the spawned
+dispatcher task (`upgrade.rs:255-287`) — nothing retains a handle the
+assembly layer can reach. `WsSessions` tracks pump handles only (the
+WS-08 abort lever). Consequences: ADR-048's "the hub holds that
+connection as a live handle" and "the hub reaches browser ops through
+the connection handle, not through `PeerRef::Specific`"
+(websocket.md §"Browsers are not alk peers") has no object to hold —
+the deployment cannot enumerate live WS sessions, cannot
+hub→browser-call an overlay op even after WS-25 defines
+registration, and cannot push-initiate anything toward a session.
+The alknet prior art retained the handle
+(`alknet-http/src/websocket/upgrade.rs:104` —
+`Arc::new(CallConnection::new_overlay_only(identity))` held by the
+session state).
+
+**Fix:** rides the WS-20 rework — the hook (or the session) retains an
+`Arc<CallConnection>` in a deployment-visible registry (shape decided
+in Unit 2 alongside the openables surface; eviction hooks into
+`WsSessions` so handles die with the session).
+
+## WS-27 [minor] — `adapter_install_channel_zero` is compiled unconditionally on `server` under `#[allow(dead_code)]`; its only caller is test-gated
+
+**Verified:** YES. `src/websocket/upgrade.rs:290-295` exports the
+`pub(crate)` wrapper; `mod.rs:36-37` re-exports it under
+`#[cfg(feature = "server")]`; the sole caller is `from_wss`'s
+`#[cfg(all(test, feature = "server"))]` test server
+(`src/adapters/from_wss.rs:352,394`). The `#[allow(dead_code)]`
+documents the current shape but the cleaner cut is gating the wrapper
+with the same cfg as its caller — moot after WS-20's rework, which
+will give both the upgrade path and the test server a real hook;
+fold the cleanup into that task.
+
+---
+
+# Non-findings (verified correct, recorded to bound the re-review)
+
+- **Channel-id collision:** accept side allocates even ids starting
+  at 2, connect side odd starting at 1
+  (`alkcall/src/channels/manager.rs:105-125`); `adopt_channel` is the
+  non-allocating side's install and returns `ChannelExists` on
+  collision (`manager.rs:273-309`). The WS browser (connect side) and
+  hub (accept side) allocation split is safe.
+- **Demux hardening already landed** (review-001 WS-12's cross-crate
+  fix): `TooLarge` skip with a 64 KiB stack buffer, cumulative
+  256 MiB skipped-bytes budget, EOF-mid-skip ends the loop
+  (`alkcall/src/channels/adapter.rs:131-222`) — the DoS shape is
+  bounded before browser traffic ever hits it.
+- **Open-op wrapper completeness:** `register_openable` covers
+  Query/Mutation (`Once`), Sub (`Stream`, one envelope then
+  out-of-band data), Pub (loud `not_implemented` stub pending the
+  channel-adoption path, alkcall C-08) — cap check → allocation →
+  ledger → spawn → teardown decrement all wired
+  (`alkcall/src/channels/operations.rs:399-453, 483-555`).
+- **Idle-knob vs silent data channels** is already documented with a
+  deployment posture (websocket.md §"Idle-read timeout": progress-
+  based deadline, `with_ws_idle_timeout(None)` posture, no
+  keepalive by decision). Wiring data channels makes the 60 s
+  default bite more often (an idle SSH-style channel is
+  silent-but-alive); the remediation plan should surface that knob
+  in the task's docs note, not change the semantics.
+- **`NoCap` default on the built-in surface** is review-001 SRV-10's
+  recorded resolution (`ChannelsPolicy` extension exists for
+  deployments; `upgrade.rs:308-317, 391-393`) — unchanged by this
+  review.
+
+---
+
+# Remediation plan
+
+Sequenced by dependency; Unit 1 is a decision task and gates the
+shape of Unit 2.
+
+## Unit 1 — alkcall decision task (WS-24, WS-25)
+
+Decide the open-op dispatch-resolution mechanism and the client-side
+op-registration question; record as alkcall ADR amendments (ADR-047
+§4 mechanism; ADR-048's bidirectionality scope) with alkhttp-side
+consequences noted.
+
+- WS-24: pick (a) per-session base registry (amend ADR-047 §4's
+  mechanism wording; add the `OperationRegistry` fork/clone surface)
+  or (b) overlay-aware top-level dispatch. Gate: an alkcall e2e test
+  where an open op registered per the *amended* mechanism resolves
+  via `run_loop_single_stream` dispatch over a channels connection.
+- WS-25: decide the client-registration story (new envelope kind /
+  channel-0 bootstrap op / explicit scope cut). Gate: the ADR (or
+  scope-cut note) exists and OQ-05/ADR-048 point at it.
+
+## Unit 2 — alkhttp wiring (WS-20, WS-21, WS-22, WS-26)
+
+- `OpenableAlpn` list + `HttpAdapter::with_ws_openable_alpns(...)`,
+  threaded through `RouterState`/`SessionState` with a
+  request-extension fallback (mirroring `ChannelsPolicy`).
+- Rework `install_channel_zero`: take the manager + policy +
+  openables; build the per-connection `ChannelCore`; register
+  `ChannelOperations` generic ops + the openables (per Unit 1's
+  shape); retain the `Arc<CallConnection>` in a deployment-visible,
+  `WsSessions`-evicted handle registry.
+- `adapter_install_channel_zero` cleanup (WS-27) rides this rework.
+- Gate: a live WS session lists `channels/<alpn>/sub` in
+  `services/list` (per Unit 1's discovery shape) and an open op on
+  channel 0 returns a `channel_id`.
+
+## Unit 3 — e2e tests (WS-23)
+
+Using `test_support::WsClient` (the Rust-native-consumer shape):
+
+1. open → `{channel_id}` → chunks flow both directions on that
+   channel → the `OpenHandler`'s `Connection` sees the bytes.
+2. `channel/close` → handler EOF + opener-ledger decrement
+   (`policy` count drops).
+3. per-identity cap denial (`channel:too_many_channels`) and
+   per-connection cap (`channel:too_many_channels` from the manager).
+4. disconnect mid-open → teardown cascade, no leak.
+5. `TooLarge` chunk on a data channel survives (demux resync) —
+   already proven alkcall-side; assert it through the WS path.
+
+## Unit 4 — spec reconciliation (docs)
+
+- OQ-05 → resolved (or narrowed to the remaining piece), with the
+  consumer-set reframe recorded (WS-23): browser + native fallback;
+  OQ-04 not blocking.
+- ADR-067 v1-cut note and ADR-048 reconciliation note updated to the
+  landed state; websocket.md §"Data channels for browsers" status
+  block removed; the alknet-ADR-044 §5 pointer checked for staleness.
+- websocket.md gains the idle-knob deployment note for silent data
+  channels (already true, just surfaced where a deployer reads).
+
+---
+
+## Verification log (this pass)
+
+- All findings carry `file:line` references verified against tree
+  `58665f2`.
+- The WS-24 dispatch claim was triple-checked: `dispatch()`'s
+  op-type lookup (`dispatch.rs:316-320`) and invoke paths
+  (`:330-341`) consult `self.registry` only; `OverlayOperationEnv`
+  (`connection.rs:731-770`) is reachable only via
+  `compose_root_env` → `context.env` layers
+  (`dispatch.rs:195-215`); alkcall's e2e test passes the
+  per-connection registry **as** the dispatcher's base registry
+  (`channels/client.rs:789-837`), not as an overlay.
+- The WS-25 claim was grep-verified across alkcall `src/`: the only
+  `register_imported*` callers are in-process import paths
+  (`protocol/adapter.rs:541,610`, `client/from_call.rs:71` doc);
+  the wire kind set is closed over the six `call.*` constants.
+- The WS-20 reference shape was read in full
+  (`channels/client.rs:767-870`), including the fresh-registry
+  detail that motivates the fork-surface ask.
+- `adapter_install_channel_zero`'s caller census:
+  `from_wss.rs:394` only (cfg(test) module).
+- Baseline gates re-run for this pass (see above): cargo test
+  (default + all-features), clippy (both), fmt. No coverage run —
+  no source changed.
\ No newline at end of file