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+# Plan — resolve review 003: the correlation-miss arrival class
+
+Status: planned (2026-11-03). Resolution of
+`docs/reviews/003-correlation-miss-arrival-class-alkssh-input.md`,
+including the verification caveats found in this session (see §Verified
+findings — they extend the review, do not contradict it).
+
+## Verified findings (the ground the plan stands on)
+
+The review's claims held under code verification. Two additions sharpen
+the resolution scope:
+
+- **A third vocabulary variant.** alksocks (`src/composed/mod.rs:497`)
+  logs the same miss class as prose at `warn` ("forwarded open with no
+  waiting session"). So the family names the stale-token miss three
+  ways: alkssh `correlation-miss` (debug), alksocks prose (warn),
+  alktunnels `handler_error`-class generic arm (warn, call-plane
+  failures only).
+- **The in-session miss is fully silent on the fabric side.** The
+  forwarded op is served establisher-less everywhere (alkssh,
+  alksocks, and this crate's own built-in shape), so an in-session
+  correlation miss (route removed while the fabric connection lives)
+  succeeds at the call plane, declines post-open in the assembly, and
+  the producer-side pump EOFs with no log at all. The generic arm
+  (`src/producer.rs:838-854`) only fires for the
+  connection-gone/NOT_FOUND/ACL-refused subclass.
+- All three are the phantom-channel shape — the ADR-049 posture
+  exception ("a refused open is a typed call error, never a phantom
+  channel") that the forwarded op's serving side currently rides.
+
+## Decisions (settled this session, pending ADR ink)
+
+1. **Route the miss through an establisher** — the serving side gains
+   an establisher variant so a no-route token returns a typed
+   `channel:open_failed` before the channel is born. The residual
+   post-open decline (a token missing between establisher pass and
+   handler run — a narrow race) keeps teardown-at-birth as the
+   fallback shape.
+2. **Reuse `unknown_resource`** as the typed reason for a stale/missing
+   token. The waiting session *is* a resource that is gone; the wire
+   vocabulary (`wire.md` §The Open Ops, `details.reason ∈`)
+   already pins it. No wire-vocabulary extension, no reason-class ADR
+   (framing option 2's "new class" question is moot).
+3. **Adopt `correlation-miss` as the canonical event name** for the
+   residual post-open decline class (alkssh's shipped vocabulary wins —
+   it is published); alksocks' prose variant retires. Level posture:
+   assembly-side declines at `debug`; the producer-side generic arm
+   stays `warn` (it now carries a typed reason instead of a prose one).
+4. **Scope of the change is additive-only** in this crate: a new
+   registration surface for the forwarded op. The base
+   `register_tunnel_forwarded_openable` shape stays (compatibility +
+   assemblies that prefer the post-open shape); the establisher
+   variant is the recommended shape and new assemblies take it by
+   default posture.
+
+## Work items
+
+### W1 — alktunnels: ADR + additive API (this repo; ~1 session)
+
+- ADR-008 amendment (or a small successor ADR): the forwarded op's
+  serving side gains an establishment phase; misses are typed failures
+  (decision 1-4 above), the residual post-open decline keeps the
+  `correlation-miss` name. Also record the tri-vocabulary history the
+  decision retires (review 003 + this plan).
+- API: an establisher variant for the forwarded-op serving half. The
+  protocol cannot hold the assembly's correlation map, so the
+  establisher's check is injected. Candidate shape (a W1 design
+  decision to finalize): a small assembly gate closure
+  (`(TunnelForwardedParams) -> Result<(), TunnelEstablishError>`) that
+  the crate wraps into the alkcall `OpenEstablisher` dance, plus
+  `register_tunnel_forwarded_openable_with_establisher(core,
+  on_registry, auth, gate, handler)`. Assemblies must not hand-roll
+  the alkcall establisher plumbing.
+- Tests: miss at the gate → `channel:open_failed` with reason
+  `unknown_resource`, no channel allocated; gate-pass → existing
+  serving flow unchanged; the residual race shape (gate passes, route
+  gone at handler time) still reaps cleanly; scope gate unchanged
+  (`tunnel:forwarded`, runs before the establisher — pin the order).
+- Update the in-code docs that describe the miss as assembly-side-only
+  (`make_forwarded_op_handler` doc, `Register…forwarded` doc).
+
+### W2 — alkssh: adopt the establisher (dedicated session; alkssh repo)
+
+- Move `pump_forwarded_arrival`'s route lookup into the new gate
+  (the `ListenRouter` lookup becomes the establisher's check); the
+  residual handler keeps `decline_arrival("correlation-miss", …)` for
+  the narrow post-open race only.
+- Verify the fabric-side silence fix: a stale-token arrival now fails
+  the open (alkssh-side typed error; producer-side generic arm fires
+  with a parseable reason) — the race window no longer produces a
+  zero-signal pump.
+- Fold alkssh's em-dash doc cleanup into its release for this change
+  ("cleanup rides the code-update release" — the user-owned task, out
+  of this plan).
+
+### W3 — alksocks: adopt the establisher (dedicated session; alksocks repo)
+
+- Move `CorrelationRegistry` lookup into the new gate; retire the
+  prose warn (the miss becomes a typed failure at the open; residual
+  logging aligns to `correlation-miss` at `debug`).
+- Fold alksocks' em-dash doc cleanup into its release for this change
+  (user-owned, out of this plan).
+
+## Ordering
+
+W1 → {W2, W3} (the dependent waves can run in parallel; each is its
+own session). Em-dash cleanup rides each repo's release for its wave
+and is otherwise out of scope here.
+
+## Acceptance criteria (plan level)
+
+- [ ] W1: ADR landed; `…_with_establisher` surface landed; tests green
+      (`cargo test`, clippy `--all-targets -D warnings`, fmt, wasm
+      check; `--all-features` as far as features exist today); review
+      003 status updated to resolved (W1 absorbed; W2/W3 pointed).
+- [ ] W2: alkssh serves the gate shape; stale-token arrival produces a
+      typed call-plane failure; residual class named
+      `correlation-miss` at `debug`; alkssh release includes its doc
+      cleanup.
+- [ ] W3: alksocks serves the gate shape; prose variant retired;
+      residual logging aligned; release includes its doc cleanup.
+- [ ] The family names the class one way in its event surface;
+      composed `-R` traces read coherently end to end.
+
+## References
+
+- `docs/reviews/003-correlation-miss-arrival-class-alkssh-input.md`
+  (the ask; this plan resolves it)
+- `docs/architecture/decisions/008-listen-metadata-forwarded-op.md` §3
+  (the serving shape this amends); alkcall ADR-049 (the establisher
+  posture being extended); `docs/architecture/wire.md` §The Open Ops
+  (the pinned `details.reason` vocabulary — unextended by this plan)
+- `src/producer.rs` (the generic arm; the forwarded-op serving half);
+  alkssh `src/tunnel_map.rs` (`pump_forwarded_arrival`,
+  `ListenRouter`); alksocks `src/composed/mod.rs`
+  (`make_forwarded_handler`, `CorrelationRegistry`)
+- alkssh `docs/plans/implementation.md` ("Still booked with their
+  owners" — the booking this filing unblocks)
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