feat(git/https): add new gh-git-credential-helper script

bin/gh-git-credential-helper

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+#
+# Git credential helper that uses GitHub CLI (gh) for authentication.
+# Falls back through multiple installation methods to find gh.
+
+# Enable debug logging with GH_CREDENTIAL_DEBUG=1
+debug() {
+  if [[ "${GH_CREDENTIAL_DEBUG:-}" == "1" ]]; then
+    echo "DEBUG: $*" >&2
+  fi
+}
+
+# Show help if requested
+if [[ "${1:-}" == "-h" || "${1:-}" == "--help" ]]; then
+  cat >&2 << 'EOF'
+Git credential helper for GitHub CLI (gh)
+
+This script attempts to use 'gh auth git-credential' through various
+installation methods:
+1. gh in PATH
+2. gh via mise tool manager
+3. gh via mise in ~/.local/bin/mise
+4. gh via mise shims
+
+Environment variables:
+  GH_CREDENTIAL_DEBUG=1    Enable debug output
+
+Configuration example for .gitconfig:
+  [credential "https://github.com"]
+      helper = !gh-git-credential-helper
+  [credential "https://gist.github.com"]
+      helper = !gh-git-credential-helper
+EOF
+  exit 0
+fi
+
+if command -v gh > /dev/null 2>&1; then
+  debug "Using gh from PATH"
+  exec gh auth git-credential "$@"
+elif command -v mise > /dev/null 2>&1; then
+  debug "Using gh via mise from PATH"
+  exec mise x gh -- gh auth git-credential "$@"
+elif [ -f "${HOME}/.local/bin/mise" ]; then
+  debug "Using gh via mise from ~/.local/bin/mise"
+  exec "${HOME}/.local/bin/mise" x gh -- gh auth git-credential "$@"
+elif [ -f "${HOME}/.local/share/mise/shims/gh" ]; then
+  debug "Using gh from mise shims"
+  exec "${HOME}/.local/share/mise/shims/gh" auth git-credential "$@"
+else
+  echo "ERROR: GitHub CLI (gh) not found via any method" >&2
+  exit 1
+fi

gitconfig

@@ -74,9 +74,9 @@
 [gitlab]
 	user = jimeh
 [credential "https://github.com"]
-	helper = !op plugin run -- gh auth git-credential
+	helper = !~/.dotfiles/bin/gh-git-credential-helper
 [credential "https://gist.github.com"]
-	helper = !op plugin run -- gh auth git-credential
+	helper = !~/.dotfiles/bin/gh-git-credential-helper
 [merge "mergiraf"]
 	name = mergiraf
 	driver = mergiraf merge --git %O %A %B -s %S -x %X -y %Y -p %P -l %L