feat: Split _path_add into _path_append and _path_prepend

_path_add only ever appended to PATH, which didn't fit profile.d/krew
and profile.d/anyenv (they prepend, to take priority). Rename it to
_path_append for clarity and add _path_prepend alongside it, so both
orderings get the same dedup guard when needed — krew and anyenv
aren't converted yet, kept as plain PATH concatenation until then.

_helpers.bash

@@ -25,12 +25,18 @@ function _source_dir_files() {
 }
 
 # Source : https://superuser.com/questions/39751/add-directory-to-path-if-its-not-already-there
-_path_add() {
+_path_append() {
 	if [ -d "$1" ] && [[ ":${PATH}:" != *":$1:"* ]]; then
 		PATH="${PATH:+"${PATH}:"}$1"
 	fi
 }
 
+_path_prepend() {
+	if [ -d "$1" ] && [[ ":${PATH}:" != *":$1:"* ]]; then
+		PATH="$1${PATH:+":${PATH}"}"
+	fi
+}
+
 _prompt_command_add() {
 	if [ -n "$1" ] && [[ ":${PROMPT_COMMAND}:" != *":$1:"* ]]; then
 		PROMPT_COMMAND="${PROMPT_COMMAND:+"${PROMPT_COMMAND};"}$1"

profile.d/path

@@ -1,6 +1,6 @@
 # Customize PATH
-_path_add "${HOME}/.bin"
+_path_append "${HOME}/.bin"
-_path_add "${HOME}/.local/bin"
+_path_append "${HOME}/.local/bin"
 
-_path_add "${HOME}/bin"
+_path_append "${HOME}/bin"
-_path_add "${HOME}/scripts"
+_path_append "${HOME}/scripts"

rc.d/rvm

@@ -5,4 +5,4 @@
 [[ -r "${HOME}/.rvm/scripts/completion" ]] && source "${HOME}/.rvm/scripts/completion"
 
 # Add RVM to PATH for scripting
-[[ -r "${HOME}/.rvm/bin" ]] && _path_add "${HOME}/.rvm/bin"
+[[ -r "${HOME}/.rvm/bin" ]] && _path_append "${HOME}/.rvm/bin"