feat(python-runtime): package the Windows x64 dsh executable

Add node24-win-x64 as the only supported Windows runtime target and publish it as a py3-none-win_amd64 wheel containing the conventional dsh and ripgrep .exe payload names. Keep Windows ARM64 rejected explicitly so Python cannot claim a carrier that CI and release automation do not build.

Teach the pkg builder to require a native x64 Windows host, validate both node-pty ConPTY addons, copy @vscode's win32 ripgrep executable, and recognize pkg's .exe output. Extend runtime resolution, wheel staging, payload validation, and the preset closure check so the Windows-specific PowerShell plugins and sidecars fail loud when omitted.

The sidecar resolver now maps a packaged main.exe to main-rg.exe; focused TypeScript and Python tests cover that name, the win_amd64 manifest, x64-only host selection, complete wheel payload, ConPTY inventory, and platform-conditioned plugin closure.

scripts/build-exe-for-python-sdk-native-pty.spec.ts

@@ -2,7 +2,7 @@ import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from 'node:fs'
 import { tmpdir } from 'node:os'
 import { dirname, join } from 'node:path'
 import { afterEach, describe, expect, it } from 'vitest'
-import { resolveLinuxNodePtyAddon } from './build-exe-for-python-sdk-native-pty.ts'
+import { resolveLinuxNodePtyAddon, resolveWindowsNodePtyAddons } from './build-exe-for-python-sdk-native-pty.ts'
 
 const roots: string[] = []
 
@@ -35,6 +35,24 @@ describe('resolveLinuxNodePtyAddon', () => {
   })
 })
 
+describe('resolveWindowsNodePtyAddons', () => {
+  it('requires both ConPTY addons from the x64 prebuild', () => {
+    const root = temporaryPackage()
+    const conpty = createAddon(root, 'prebuilds', 'win32-x64', 'conpty.node')
+    const consoleList = createAddon(root, 'prebuilds', 'win32-x64', 'conpty_console_list.node')
+
+    expect(resolveWindowsNodePtyAddons(root, 'x64')).toEqual([conpty, consoleList])
+  })
+
+  it('names every missing Windows addon', () => {
+    const root = temporaryPackage()
+
+    expect(() => resolveWindowsNodePtyAddons(root, 'x64')).toThrow(
+      `Windows node-pty addons are missing: ${join(root, 'prebuilds', 'win32-x64', 'conpty.node')}, ${join(root, 'prebuilds', 'win32-x64', 'conpty_console_list.node')}`,
+    )
+  })
+})
+
 function temporaryPackage(): string {
   const root = mkdtempSync(join(tmpdir(), 'dsh-node-pty-addon-'))
   roots.push(root)