fix(cli): avoid Windows shell for mcp dev #2031

Job	Run time
checks / readme-snippets	14s
checks / pre-commit	34s
checks / test (3.11, lowest-direct, ubuntu-latest)	58s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 1s
checks / test (3.10, locked, ubuntu-latest)	54s
checks / test (3.11, lowest-direct, windows-latest)	3m 22s
checks / test (3.10, lowest-direct, windows-latest)	2m 55s
checks / test (3.10, locked, windows-latest)	2m 20s
checks / test (3.14, lowest-direct, windows-latest)	2m 17s
checks / test (3.14, locked, windows-latest)	3m 4s
checks / test (3.12, locked, ubuntu-latest)	57s
checks / test (3.13, locked, windows-latest)	2m 24s
checks / test (3.12, lowest-direct, ubuntu-latest)	59s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.12, lowest-direct, windows-latest)	3m 13s
checks / test (3.13, locked, ubuntu-latest)	41s
checks / test (3.13, lowest-direct, ubuntu-latest)	55s
checks / test (3.14, locked, ubuntu-latest)	2m 28s
checks / test (3.12, locked, windows-latest)	3m 3s
checks / test (3.13, lowest-direct, windows-latest)	2m 37s
checks / test (3.11, locked, ubuntu-latest)	55s
checks / test (3.11, locked, windows-latest)	2m 30s
all-green	2s
	39m 44s

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