fix: improve Windows compatibility for CLI commands and sandbox (#261)

## Fix Windows compatibility issues (#248)

This PR addresses the Windows compatibility issues reported in #248:

1. **Fix sandbox initialization failure on Windows**
- Modified `getSandbox()` to return `SandboxType.NONE` on Windows
instead of throwing an error
- Added a warning log message to inform the user that sandbox is not
available on Windows

2. **Fix Unix commands not working on Windows**
- Created a new module
[platform-commands.ts](cci:7://file:///c:/Users/HP%20840%20G6/workflow/codex/codex-cli/src/utils/agent/platform-commands.ts:0:0-0:0)
that automatically adapts Unix commands to their Windows equivalents
   - Implemented a mapping table for common commands and their options
   - Integrated this functionality into the command execution process

### Testing
Tested on Windows 10 with the following commands:
- `ls -R .` (now automatically translates to `dir /s .`)
- Other Unix commands like `grep`, `cat`, etc.

The CLI no longer crashes when running these commands on Windows.

I have read the CLA Document and I hereby sign the CLA

---------

Signed-off-by: Alpha Diop <alphakhoss@gmail.com>

codex-cli/src/utils/agent/sandbox/raw-exec.ts

@@ -8,6 +8,7 @@ import type {
 } from "child_process";
 
 import { log, isLoggingEnabled } from "../log.js";
+import { adaptCommandForPlatform } from "../platform-commands.js";
 import { spawn } from "child_process";
 import * as os from "os";
 
@@ -23,7 +24,21 @@ export function exec(
   _writableRoots: Array<string>,
   abortSignal?: AbortSignal,
 ): Promise<ExecResult> {
-  const prog = command[0];
+  // Adapt command for the current platform (e.g., convert 'ls' to 'dir' on Windows)
+  const adaptedCommand = adaptCommandForPlatform(command);
+
+  if (
+    isLoggingEnabled() &&
+    JSON.stringify(adaptedCommand) !== JSON.stringify(command)
+  ) {
+    log(
+      `Command adapted for platform: ${command.join(
+        " ",
+      )} -> ${adaptedCommand.join(" ")}`,
+    );
+  }
+
+  const prog = adaptedCommand[0];
   if (typeof prog !== "string") {
     return Promise.resolve({
       stdout: "",
@@ -72,7 +87,7 @@ export function exec(
     detached: true,
   };
 
-  const child: ChildProcess = spawn(prog, command.slice(1), fullOptions);
+  const child: ChildProcess = spawn(prog, adaptedCommand.slice(1), fullOptions);
   // If an AbortSignal is provided, ensure the spawned process is terminated
   // when the signal is triggered so that cancellations propagate down to any
   // long‑running child processes. We default to SIGTERM to give the process a