fix(client): close transport when connect-signal aborts during auto-open ack wait; drop old-layout listen examples (live in #2325); e2e CLAUDE.md doc nit

Author: felixweinberger

examples/client/README.md

@@ -36,7 +36,6 @@ Most clients expect a server to be running. Start one from [`../server/README.md
 | Client credentials (M2M)                            | Machine-to-machine OAuth client credentials example.                               | [`src/simpleClientCredentials.ts`](src/simpleClientCredentials.ts)                         |
 | URL elicitation client                              | Drives URL-mode elicitation flows (sensitive input in a browser).                  | [`src/elicitationUrlExample.ts`](src/elicitationUrlExample.ts)                             |
 | Multi-round-trip client (2026-07-28)                | Calls a write-once tool twice: default auto-fulfilment, then manual mode.          | [`src/multiRoundTripClient.ts`](src/multiRoundTripClient.ts)                               |
-| Subscriptions/listen client (2026-07-28)            | `listChanged` auto-open then manual `client.listen()`; closes after a few changes. | [`src/subscriptionsListenClient.ts`](src/subscriptionsListenClient.ts)                     |
 
 ## URL elicitation example (server + client)
 

examples/client/src/subscriptionsListenClient.ts

@@ -39,7 +39,6 @@ pnpm tsx src/simpleStreamableHttp.ts
 | Hono Streamable HTTP server               | Streamable HTTP server built with Hono instead of Express.                                                                  | [`src/honoWebStandardStreamableHttp.ts`](src/honoWebStandardStreamableHttp.ts)           |
 | SSE polling demo server                   | Legacy SSE server intended for polling demos.                                                                               | [`src/ssePollingExample.ts`](src/ssePollingExample.ts)                                   |
 | Multi-round-trip server (2026-07-28)      | Write-once tool that returns `inputRequired(...)` (form + URL elicitation, requestState echo) via `createMcpHandler`.       | [`src/multiRoundTrip.ts`](src/multiRoundTrip.ts)                                         |
-| Subscriptions/listen server (2026-07-28)  | Publishes `tools/list_changed` to open `subscriptions/listen` streams via `handler.notify.toolsChanged()`.                  | [`src/subscriptionsListen.ts`](src/subscriptionsListen.ts)                               |
 
 ## OAuth demo flags (Streamable HTTP server)
 

examples/server/README.md

@@ -974,9 +974,15 @@ export class Client extends Protocol<ClientContext> {
                     });
                 } catch (error) {
                     // Connect-signal abort during the ack wait propagates as a
-                    // connect() rejection (caller asked to abort connect); a
-                    // server-side refusal stays a soft onerror.
-                    if (options?.signal?.aborted) throw error;
+                    // connect() rejection (caller asked to abort connect). The
+                    // transport is already started, so close it before
+                    // rethrowing — a connect() rejection MUST NOT leave a
+                    // half-open connection. A server-side refusal stays a
+                    // soft onerror (connect succeeds, no listen stream).
+                    if (options?.signal?.aborted) {
+                        void this.close();
+                        throw error;
+                    }
                     this.onerror?.(error instanceof Error ? error : new Error(String(error)));
                 } finally {
                     options?.signal?.removeEventListener('abort', onConnectAbort);

examples/server/src/subscriptionsListen.ts

@@ -73,7 +73,7 @@ entryExclusions: [{ arm: 'entryModern', reason: 'method-not-in-modern-registry'
 ```
 
 Omitting `arm` excludes both arms. The reasons (`EntryExclusionReason` in types.ts) are the acceptance checklist for re-admitting cells when the corresponding entry feature lands; a coverage gate rejects annotations that would never have an effect. Requirement families that the
-per-request entry structurally cannot serve at all (server→client requests, sessions/resumability, standalone GET streams, subscriptions) are already expressed through their `transports` restrictions and need no annotation.
+per-request entry structurally cannot serve at all (server→client requests, sessions/resumability, standalone GET streams) are already expressed through their `transports` restrictions and need no annotation.
 
 Arm-specific helpers: `wire()`'s fourth argument also accepts `entry` (createMcpHandler hosting overrides — e.g. a `responseMode` or a different `legacy` posture), the returned `Wired.httpLog` records every HTTP exchange (request body, status, content-type, a readable response
 clone) for raw wire assertions, factories may accept the optional per-request context (`EntryServerFactory`), and `modernEnvelopeMeta()` builds the envelope for bodies that POST raw 2026-era requests through `wired.fetch`. Compositions that the entry no longer expresses through