docs: add Git Bash on Windows section to installing guide

[Copilot]

WP-CLI's wp.bat wrapper doesn't work in Git Bash on Windows, leaving users without a clear path forward. This adds a dedicated subsection under "Installing on Windows" explaining how to create a POSIX-compatible wp wrapper file (no extension) that works in Git Bash, including Cygwin path translation logic.

Changes

• guides/installing.md — added #### Using WP-CLI with Git Bash on Windows subsection after the existing Windows CLI instructions, with the following wrapper script to place at c:\wp-cli\wp:

#!/usr/bin/env sh

dir=$(d=${0%[/\\]*}; cd "$d"; pwd)

# See if we are running in Cygwin by checking for cygpath program
if command -v 'cygpath' >/dev/null 2>&1; then
    if [[ $(which php) == /cygdrive/* ]]; then
        dir=$(cygpath -m $dir);
    fi
fi

dir=$(echo $dir | sed 's/ /\ /g')
"${dir}/wp-cli.phar" "$@"

[swissspidy]

/gemini review

[gemini-code-assist]

Code Review

This pull request adds a guide and a shell script wrapper for running WP-CLI within Git Bash on Windows. The review feedback identifies several technical improvements for the script, including switching the shebang to bash to support specific syntax, enhancing path detection for MSYS2 environments, and fixing a logic error in how directory paths with spaces are handled.

[Copilot]

Pull request overview

Adds Git Bash-specific guidance to the Windows installation docs so users can run WP-CLI from Git Bash by creating a POSIX-style wp wrapper script alongside wp-cli.phar.

Changes:

• Added a new “Using WP-CLI with Git Bash on Windows” subsection under “Installing on Windows”.
• Documented a wp (no-extension) shell wrapper script intended to run wp-cli.phar from Git Bash, including optional Cygwin path translation logic.

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