- Make examples/{client,server}-quickstart extend @modelcontextprotocol/tsconfig
  instead of carrying standalone compilerOptions. Drop the inline target/lib/
  module/moduleResolution/strict/etc. duplicates; only outDir, rootDir,
  declaration overrides, and workspace paths remain.
- Align docs/{client,server}-quickstart.md tsconfig snippets to ESNext/bundler
  to match what the example projects now compile under.
- Adjust examples/client-quickstart/src/index.ts for the stricter
  noUncheckedIndexedAccess inherited from the shared base.
- Strip leftover .js suffixes from vi.mock / vi.importActual string specifiers
  in packages/client/test/client/middleware.test.ts.

The shared @modelcontextprotocol/tsconfig sets types: [node, vitest/globals],
which the quickstarts inherit even though neither declares vitest as a
devDependency — tsc only finds vitest types via the hoisted workspace root
node_modules. Override types: [node] on each quickstart compilerOptions to
break the accidental coupling.

…cli.ts

- Update docs/client-quickstart.md and docs/server-quickstart.md tsconfig
  blocks to target: ESNext / lib: [ESNext], matching the shared base the
  example tsconfigs now inherit from (was ES2023/ES2022, drifted after
  consolidation onto @modelcontextprotocol/tsconfig).
- Delete scripts/cli.ts and the dangling server/client npm scripts that
  referenced it across packages/{client,core,server}, packages/middleware/node,
  test/{integration,helpers,conformance}, and examples/{client,server,shared}.
  The file's imports point at ../src/* paths that ceased to exist post-monorepo;
  no tsconfig builds it and no working npm script can reach it.

…kage

The packages/codemod/ package (added in #1950) was written before the
bundler resolution flip and used the old .js-extension import convention.
This brings it in line with the rest of the repo. Backtick string fixtures
that simulate user code (which intentionally still uses .js) are left alone.

Cover server-legacy, e2e tests, and jsonSchemaValidatorOverride tests
that were added after the branch diverged.

…olver comment

tsx is no longer invoked by core/client/server/middleware-node/examples-shared
after the dead server/client npm scripts were removed; test/e2e, codemod and
the workspace root keep theirs. Also update the eslint-config resolver comment
that still described NodeNext-style './foo.js' imports.