[codex] Add native Windows shell support

[yurilopes]

What changed

This PR improves DevSpace shell execution on Windows while preserving the existing Bash behavior for Linux, macOS, and users who explicitly opt into Bash.

• Adds DEVSPACE_SHELL=auto|bash|powershell|cmd.
• Uses native PowerShell by default on Windows instead of routing PowerShell commands through Bash/MSYS.
• Adds native cmd.exe support via DEVSPACE_SHELL=cmd.
• Keeps Pi's Bash backend for DEVSPACE_SHELL=bash and non-Windows defaults.
• Adds a PowerShell guardrail that blocks fragile -match usage with raw Windows path literals, including literals assigned to variables and then passed to -match.
• Updates devspace doctor, MCP tool guidance, docs, and tests.

Why

When ChatGPT generated PowerShell commands through the previous Bash-backed shell, Bash/MSYS could expand PowerShell syntax such as $_.CommandLine before PowerShell received it. Native PowerShell execution fixes that transport issue.

A second common failure mode remained: using PowerShell -match for literal Windows path fragments. -match is regex-based, so path fragments like \profiles can trigger malformed regex escapes such as \p. The new guardrail blocks the fragile pattern and tells the model to use .Contains(), -like, or [regex]::Escape().

Impact

Windows users can run DevSpace with native PowerShell by default. Existing Bash workflows remain available with DEVSPACE_SHELL=bash, and Linux/macOS behavior stays on the existing Bash backend.

Validation

• npm test
• npm run typecheck
• npm run build
• git diff --check
• Manual global install and devspace doctor on Windows confirmed Shell mode: auto resolves to native PowerShell.

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[Waishnav]

@yurilopes i've no idea how openai have supported windows on codex CLI on windows, do it supports through custom powershell tool or smth?

[yurilopes]

@yurilopes i've no idea how openai have supported windows on codex CLI on windows, do it supports through custom powershell tool or smth?

Yes, it does. It supports PowerShell and cmd.exe syntax. PowerShell syntax is the preferred one. I'm a heavy Windows user and have been using the changes I proposed with great results. It's seamless, just working fine with PowerShell.