fix: make MCP bootstrap client-neutral by default
Owner integration: preserve all prior CI contracts, document explicit host selection on Windows, and make the Bash manifest regression UTF-8 deterministic.
The anything-analyzer start path backgrounds `nohup pnpm dev`. On Ubuntu CI
that never invoked the pnpm stub, so the source-pin regression missed the
argv. Intercept nohup like sudo, and fall back to a plain background when
nohup is absent.
After Kali detection stopped using grep, Ubuntu CI reached python install
and called apt-get, which the macOS-oriented fixture never stubbed. Detect
Kali with builtins only, and accept brew or apt-get as the python sink.
is_kali called grep on every Linux run, so the PATH-stripped parser-bootstrap
regression aborted before the pin gate. Detect Kali from os-release with tr,
and write Unix stubs as LF/UTF-8 so Linux pwsh can execute them.
zhaoxuya520