Reject malformed MCP process argument lists #413

🤖 Generated by the Agentic Engineer

Problem

An args object passes package validation despite process arguments needing a list of strings. Installation can therefore deliver a connection that cannot start.

Proposed direction

Validate an optional argument list without altering legitimate empty arguments or argument order.

Acceptance criteria

• Reject non-array arguments and nonstring members.
• Preserve missing, empty and ordered string arguments.
• Run behavioral package regressions.

Reproduced on current main before implementation. Rough size: S.