Node has refused shell-free `.cmd`/`.bat` spawns since CVE-2024-27980, and an
npm-installed `claude` is a `.cmd` shim on Windows — so every shell-free spawn
of it reported ENOENT there, each in a quiet way: `verify:skills` skipped its
authoritative hand-off, `verify:skills:cli` downloaded the pinned package it
already had (and failed offline), and `skills:eval` said "not on PATH".
- New `scripts/lib/claude-cli.mjs` is the one place that decides how `claude` is
spawned: `shell` on win32, arguments through the existing `winShellArgs`
quoting so `cmd.exe` cannot re-parse them as syntax (#1939). Unit-tested with
the platform injected, since a win32-only bug no runner here executes is
exactly the kind that ships.
- `verify-skills`, `verify-skills-cli` and `skill-eval` all route their probes
and spawns through it.
- skill-eval sends the prompt on **stdin** rather than in argv. `claude -p` reads
a piped prompt (verified end to end), which sidesteps `cmd.exe` metacharacter
re-parsing entirely rather than relying on quoting a model-visible string, and
keeps the prompt out of the process table.
Signed-off-by: cliffhall <cliff@futurescale.com>
