Fix streamable HTTP SSE exhaustion

[pradeep-ramola]

Fixes #2098

Summary

Updates StreamableHTTPClientTransport so the standalone GET SSE channel does not silently become unusable after reconnect exhaustion.

This change:

• raises the default Streamable HTTP SSE reconnection retry count from 2 to 10
• records when the standalone GET SSE stream exhausts reconnect attempts
• fails subsequent sends immediately with a clear error instead of POSTing into a dead response channel
• preserves existing per-request stream exhaustion behavior via onRequestStreamEnd
• includes response text in failed SSE-open errors when statusText is empty

Testing

• corepack pnpm --filter @modelcontextprotocol/client exec vitest run test/client/streamableHttp.test.ts
• corepack pnpm --filter @modelcontextprotocol/client typecheck
• corepack pnpm --filter @modelcontextprotocol/client build
• corepack pnpm --filter @modelcontextprotocol/client exec prettier --ignore-path ../../.prettierignore --check src/client/streamableHttp.ts test/client/streamableHttp.test.ts
• corepack pnpm --filter @modelcontextprotocol/client exec eslint src/client/streamableHttp.ts

[changeset-bot]

🦋 Changeset detected

Latest commit: ce7a5be

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

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[pkg-pr-new]

Open in StackBlitz

@modelcontextprotocol/client

npm i https://pkg.pr.new/@modelcontextprotocol/client@2517

@modelcontextprotocol/codemod

npm i https://pkg.pr.new/@modelcontextprotocol/codemod@2517

@modelcontextprotocol/core

npm i https://pkg.pr.new/@modelcontextprotocol/core@2517

@modelcontextprotocol/server

npm i https://pkg.pr.new/@modelcontextprotocol/server@2517

@modelcontextprotocol/server-legacy

npm i https://pkg.pr.new/@modelcontextprotocol/server-legacy@2517

@modelcontextprotocol/express

npm i https://pkg.pr.new/@modelcontextprotocol/express@2517

@modelcontextprotocol/fastify

npm i https://pkg.pr.new/@modelcontextprotocol/fastify@2517

@modelcontextprotocol/hono

npm i https://pkg.pr.new/@modelcontextprotocol/hono@2517

@modelcontextprotocol/node

npm i https://pkg.pr.new/@modelcontextprotocol/node@2517

commit: ce7a5be