Return protocol errors for invalid tool arguments

[FU-max-boop]

Summary

• propagate ProtocolError from high-level tools/call handling instead of wrapping it as a CallToolResult error
• keep ordinary tool handler exceptions as tool execution errors
• add an in-memory regression test showing invalid tool arguments return JSON-RPC InvalidParams and do not invoke the handler

Fixes #2162

Tests

• npx -y pnpm@10.26.1 --dir packages/server exec vitest run test/server/mcp.compat.test.ts
• npx -y pnpm@10.26.1 --dir packages/server exec eslint src/server/mcp.ts test/server/mcp.compat.test.ts
• npx -y pnpm@10.26.1 --dir packages/server exec prettier --ignore-path ../../.prettierignore --check src/server/mcp.ts test/server/mcp.compat.test.ts
• npx -y pnpm@10.26.1 --dir packages/server run typecheck

[changeset-bot]

🦋 Changeset detected

Latest commit: e307e57

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

This PR includes changesets to release 1 package

Name	Type
@modelcontextprotocol/server	Patch

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commit: e307e57