feat: add Fish function wrappers for copilot suggest/explain commands

Replace gh copilot aliases with custom Fish functions that provide better help
text and wrap the copilot CLI with appropriate prompts

home/dot_config/fish/functions/suggest.fish

@@ -0,0 +1,32 @@
+function suggest --description "Suggest a command using GitHub Copilot"
+    argparse --name=suggest \
+        'd/debug' \
+        'h/help' \
+        'hostname=' \
+        't/target=' \
+        -- $argv
+    or return 1
+
+    if set -q _flag_help
+        echo "Wrapper around \`copilot\` to suggest a command."
+        echo "Places suggested command on the command line for review/editing."
+        echo
+        echo "USAGE"
+        echo "  suggest [flags] <prompt>"
+        echo
+        echo "FLAGS"
+        echo "  -d, --debug            Enable debugging"
+        echo "  -h, --help             Display help usage"
+        echo "      --hostname HOST    GitHub host for authentication"
+        echo "  -t, --target TARGET    Target: shell (default), gh, git"
+        echo
+        echo "EXAMPLES"
+        echo "  suggest"
+        echo "  suggest -t git 'Undo the most recent local commits'"
+        echo "  suggest -t gh 'Create pull request'"
+        echo "  suggest 'Convert MOV to animated PNG'"
+        return 0
+    end
+
+    copilot -p "suggest: $argv" --allow-all-tools
+end