feat(sandbox): Windows ACL write-restriction sandbox (restricted-token runner)

Confine Windows command execution through a WRITE_RESTRICTED token whose restricting SIDs carry an orphan-SID write allowlist, ported from https://github.com/huoyaoyuan/windows-acl-restrict-poc (@ 10e4dfb). Every Win32 call is checked and fails closed - the POC silently ran children with the FULL token when CreateRestrictedToken failed.

- @deepseek-ai/dsh-sandbox-windows-acl: koffi primitives verified against the MinGW Windows headers (verify/abi-probe.cpp) plus the confinement runner ([node, runner, --workspace, --temp, --mode, --, argv...]: kill-on-close job, stdio passthrough, exit-code mirroring, windows-acl-run: failure signature, grant revocation). read-only = strict zero grants (NUL device not writable; documented). Windows-only execution: exempted from the Linux coverage lane (windowsOnlyCoverageExclusions).
- @deepseek-ai/dsh-sandbox-local: PLATFORM_CHAINS.win32 filled with the windows-acl runner (full enforcement, ACL denial dialect, runner-failure rules).
- @deepseek-ai/dsh-pwsh-sandbox: sandbox-consuming pwsh executor (call-for-call mirror of dsh-bash-sandbox) over a new argv-level seam in dsh-pwsh-local; per-file coverage complete via the fake-provider spec.
- bundle/base: the Windows platform layer mounts the confined pwsh roster - sandbox/policy/fs-sandbox/permission/approval re-enabled, the POSIX bash stack stays disabled.

Co-authored-by: Huo Yaoyuan <huoyaoyuan@hotmail.com>

packages/sandbox/sandbox-windows-acl/tsdown.config.ts

@@ -0,0 +1,16 @@
+import { defineConfig } from 'tsdown'
+
+// The confinement runner builds as its own entry (path-loaded by
+// dsh-sandbox-local's win32 chain), inlining the sandbox primitives while
+// koffi stays an external native require — the same shape as
+// directory-picker-native's worker entry.
+export default defineConfig({
+  entry: { index: 'lib/types/index.js', invariant: 'lib/types/invariant.js', runner: 'lib/types/runner.js' },
+  outDir: 'lib',
+  format: ['esm'],
+  platform: 'node',
+  target: 'es2024',
+  fixedExtension: false,
+  dts: false,
+  clean: false,
+})