Allow streamable HTTP transport restart after close

[FU-max-boop]

Summary

Fixes #1641.

StreamableHTTPClientTransport.close() aborted the current controller but kept the aborted controller object around. A later start() therefore treated the transport as already started, which breaks reconnect flows that close the transport during OAuth and then start it again after authorization.

This clears the controller after aborting it, and updates the delayed reconnect guard so late scheduler callbacks also stop when the transport has been closed and the controller has been cleared.

Tests

• corepack pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
• corepack pnpm --filter @modelcontextprotocol/client lint
• corepack pnpm --filter @modelcontextprotocol/client typecheck
• git diff --check

Note: the first attempt to run the package test via corepack pnpm --filter @modelcontextprotocol/client test -- streamableHttp.test.ts executed the broader client suite and only failed because barrelClean.test.ts spawns pnpm by name, while this environment only exposes pnpm through Corepack. The targeted pnpm exec vitest run above passed.

[changeset-bot]

🦋 Changeset detected

Latest commit: d2bf224

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

This PR includes changesets to release 1 package

Name	Type
@modelcontextprotocol/client	Patch

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commit: d2bf224