Adds @deepseek-ai/dsh-tool-pwsh-persistent, the mirror of
tool-bash-persistent for PowerShell: one owner-scoped persistent pwsh
per agent, an Invoke-Expression wrapper with backtick-escaped bodies and
exact native exit codes ( reset, \True fallback, catch to 1),
PSReadLine-echo tolerance (the echoed wrapper is stripped from captured
output and can never fabricate completion), and the same
timeout/cancel/exit reset semantics with pwsh-flavored diagnostics.
The minimal preset now gates its persistent shell stack by platform with
the #2234 disabled interpolation: the bash rows mount on POSIX and the
pwsh rows (pty-local shellDialect pwsh + the new tool) on win32, keeping
exactly one persistent shell per host. windows-shell.spec pins the
per-platform roster; the real Loader composition proves cwd/env
persistence, multiline and here-string commands, large-output clipping,
and exit/reset over a real ConPTY pwsh.
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