fix(net): end a resumed track the way a direct one ends

js/net/src/group.ts

@@ -948,6 +948,11 @@ export class Consumer {
 
 	/** Closes the group, optionally with an error to abort readers. Idempotent. */
 	close(abort?: Error) {
+		// A copy failure recovery was continuing past ends with the abort instead.
+		if (abort && this.#recover && this.#state.closed.peek() instanceof Error) {
+			this.#terminal ??= abort;
+			if (this.#verdict.peek() === undefined) this.#verdict.set(this.#terminal);
+		}
 		this.#abandon();
 		this.#recover = undefined;
 		// Closing is terminal for this reader, even with frames still unread.

js/net/src/internal.ts

@@ -351,7 +351,7 @@ export interface ResumeSource {
 	latest(): number | undefined;
 	/** The serving copy's declared start, raised to its cursor floor, or `"pending"` until resolved. */
 	start(): number | "pending" | undefined;
-	/** The serving copy's declared exclusive end. */
+	/** The logical track's declared exclusive end, as the first copy to know it declared it. */
 	end(): Location | undefined;
 	/** Resolve with the logical track's exclusive end once known. */
 	finished(): Promise<Location>;
@@ -469,6 +469,11 @@ export const hooks: {
 	tryRecvDatagram: (subscriber: Subscriber) => RecvDatagram;
 	/** Whether a buffered group in `[start, end)` that `delivered` lacks still waits to be read. */
 	hasUnreadGroup: (subscriber: Subscriber, start: number, end: number | undefined, delivered: Delivered) => boolean;
+	/**
+	 * Whether a subscriber's track ended and it holds nothing left to read: no datagram within its
+	 * cursor, and no group in `[start, end)` that `delivered` lacks.
+	 */
+	spent: (subscriber: Subscriber, start: number, end: number | undefined, delivered: Delivered) => boolean;
 	/** How many runs of handed-out groups a subscriber remembers: one per gap, plus the floor. Tests only. */
 	deliveredRuns: (subscriber: Subscriber) => number;
 	/** Forget the gaps in another reader's `delivered` below each group past this subscriber's budget. */
@@ -642,6 +647,9 @@ export const hooks: {
 	hasUnreadGroup: () => {
 		throw new Error("track.ts not loaded");
 	},
+	spent: () => {
+		throw new Error("track.ts not loaded");
+	},
 	staleAt: () => {
 		throw new Error("track.ts not loaded");
 	},