[dotfiles-improvement] perf: replace find-subshell dir-checks with ZSH glob in git-utils.zsh

[github-actions]

What

Six functions in zsh/functions/git-utils.zsh use a subshell $(find ...) call just to check if any directories matching a glob pattern exist before proceeding:

# Before (spawns a subshell every call)
if [[ -z "$(find . -type d -maxdepth 1 -name "$1" -print -quit)" ]]; then
    echo "❌ No directories found matching pattern: $1" >&2
    return 1
fi

Change

Replace with ZSH-native glob qualifier (N/) — no subshell, no fork:

# After (pure ZSH, no subprocess)
local -a _match_dirs=( ./${~1}(N/) )
if (( ${#_match_dirs} == 0 )); then
    echo "❌ No directories found matching pattern: $1" >&2
    return 1
fi

• (N/) = nullglob (no error if no match) + only match directories
• ${~1} = expand $1 as a glob pattern (e.g. velero* stays a glob)
• Consistent with the noglob aliases already defined at the bottom of the file

Affected functions (6 occurrences)

• go-mod-upgrade-dirs
• exec-dirs
• exec-dirs-ds
• exec-dirs-ds-echo
• code-dirs
• finder-dirs

No behavior change

Semantically equivalent to the find -print -quit check. The noglob aliases that call these functions already pass raw glob patterns (e.g. velero*), which ${~var} handles correctly.

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