fix(shell): preserve pathname expansion in scripts

[RSS1102]

Motivation

Package scripts run by package managers rely on the platform shell for pathname expansion. Vite Task's static command path flattened unquoted patterns such as packages/*/src into literal arguments, so vp run behaved differently from pnpm run and tools received the unexpanded pattern.

Fixes #573.

Summary

• fall back to the platform shell when a program or argument contains unquoted pathname-expansion characters
• keep quoted, escaped, and assignment-value patterns on the static command path
• cover parser decisions, execution plans, and Unix/Windows package-script behavior with regression snapshots
• document the user-visible fix in the changelog