[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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