fix(client): follow repeated opaque cursors

[mikemikimike]

Fixes #2735

Background

The automatic list pagination path treated repeated cursor values as a reason to stop. MCP cursors are opaque, so a conforming server may return the same cursor for multiple pages. Stopping on repetition silently returned an incomplete list.

Changes

• Remove cursor-value deduplication from Client._listAllPages.
• Continue requesting pages until the server omits nextCursor.
• Retain the existing listMaxPages hard cap so non-terminating pagination still fails with ListPaginationExceeded.
• Add a regression test covering repeated cursors and a patch changeset for @modelcontextprotocol/client.

Compatibility

This preserves the public pagination API and follows opaque cursor semantics. Servers that do not terminate pagination remain bounded by listMaxPages; only the prior silent truncation behavior changes.

Verification

• pnpm install --frozen-lockfile — blocked by Windows EPERM while copying files from the pnpm store into node_modules.
• pnpm install --frozen-lockfile --force — same Windows EPERM during dependency installation.
• pnpm test:all and pnpm lint:all could not run because the locked dependency installation did not complete.
• git diff --check — passed.

The focused Vitest and typecheck commands remain to be run in CI or another environment where the locked workspace dependencies can be installed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 16a3e17

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 6 packages

Name	Type
@modelcontextprotocol/client	Patch
@modelcontextprotocol/core	Patch
@modelcontextprotocol/server	Patch
@modelcontextprotocol/server-legacy	Patch
@modelcontextprotocol/codemod	Patch
@modelcontextprotocol/core-internal	Patch

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commit: 16a3e17