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"@jmfederico/pi-web": patch
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Fix `pi-web doctor` "can find npm/pi" checks on fish. The `--version` check
wrapped the version command in a POSIX subshell `(cmd --version 2>&1 || true)`,
which fish parses as a command substitution in command position and rejects
(`command substitutions not allowed in command position`), producing a false
negative. Emit fish's `begin; ...; end` grouping when the service shell is fish.