fix(non-interactive-env): honor Windows ComSpec shell

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/hooks/non-interactive-env/index.test.ts

@@ -13,6 +13,7 @@ describe("non-interactive-env hook", () => {
       SHELL: process.env.SHELL,
       PSModulePath: process.env.PSModulePath,
       MSYSTEM: process.env.MSYSTEM,
+      ComSpec: process.env.ComSpec,
       CI: process.env.CI,
       OPENCODE_NON_INTERACTIVE: process.env.OPENCODE_NON_INTERACTIVE,
     }
@@ -298,6 +299,30 @@ describe("non-interactive-env hook", () => {
       expect(cmd).not.toContain("export ")
     })
 
+    test("#given Windows ComSpec=pwsh.exe without SHELL #when bash tool git command executes #then uses powershell syntax", async () => {
+      delete process.env.SHELL
+      delete process.env.MSYSTEM
+      process.env.ComSpec = "C:\\Program Files\\PowerShell\\7\\pwsh.exe"
+      process.env.PSModulePath = "C:\\Program Files\\PowerShell\\Modules"
+      Object.defineProperty(process, "platform", { value: "win32" })
+
+      const hook = createNonInteractiveEnvHook(mockCtx)
+      const output: { args: Record<string, unknown>; message?: string } = {
+        args: { command: "git status" },
+      }
+
+      await hook["tool.execute.before"](
+        { tool: "bash", sessionID: "test", callID: "1" },
+        output
+      )
+
+      const cmd = output.args.command as string
+      expect(cmd).toStartWith("$env:")
+      expect(cmd).toContain("; git status")
+      expect(cmd).not.toContain("set ")
+      expect(cmd).not.toContain("export ")
+    })
+
     test("#given Windows SHELL=pwsh.exe #when bash tool git command executes #then uses powershell syntax", async () => {
       process.env.SHELL = "C:\\Program Files\\PowerShell\\7\\pwsh.exe"
       delete process.env.MSYSTEM

src/hooks/non-interactive-env/non-interactive-env-hook.ts

@@ -20,24 +20,36 @@ function detectBannedCommand(command: string): string | undefined {
   return undefined
 }
 
+function detectWindowsShellType(shellPath: string | undefined): ShellType | undefined {
+  if (!shellPath) {
+    return undefined
+  }
+
+  const shellName = shellPath.replace(/\\/g, "/").split("/").pop()?.toLowerCase()
+  if (shellName === "cmd" || shellName === "cmd.exe") {
+    return "cmd"
+  }
+  if (
+    shellName === "powershell" ||
+    shellName === "powershell.exe" ||
+    shellName === "pwsh" ||
+    shellName === "pwsh.exe"
+  ) {
+    return "powershell"
+  }
+  return undefined
+}
+
 function detectCommandShellType(): ShellType {
   if (process.platform === "win32" && process.env.SHELL) {
-    const shellName = process.env.SHELL.replace(/\\/g, "/").split("/").pop()?.toLowerCase()
-    if (shellName === "cmd" || shellName === "cmd.exe") {
-      return "cmd"
-    }
-    if (
-      shellName === "powershell" ||
-      shellName === "powershell.exe" ||
-      shellName === "pwsh" ||
-      shellName === "pwsh.exe"
-    ) {
-      return "powershell"
+    const shellType = detectWindowsShellType(process.env.SHELL)
+    if (shellType) {
+      return shellType
     }
   }
 
   if (process.platform === "win32" && !process.env.SHELL && !process.env.MSYSTEM) {
-    return "cmd"
+    return detectWindowsShellType(process.env.ComSpec) ?? "cmd"
   }
 
   return detectShellType()