Import VX multicall utility and applets

tests/test_which.sh

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+#!/bin/sh
+# tests/test_which.sh - Tests for which applet
+_test_name="which"
+. "$(dirname "$0")/harness.sh"
+
+setup_tmpdir
+WHICH="$VX which"
+
+echo "Running which tests..."
+
+# --- basic: find a known binary ---
+_got="$($WHICH sh 2>/dev/null)"
+# sh should resolve to something in PATH
+if [ -n "$_got" ] && [ -x "$_got" ]; then
+    pass "basic: finds sh"
+else
+    fail "basic: finds sh" "got: $_got"
+fi
+
+# --- basic: nonexistent command ---
+check_exit "basic: nonexistent exits 1" 1 $WHICH this_command_does_not_exist_xyz
+
+# --- -s (silent) ---
+_got="$($WHICH -s sh 2>/dev/null)"
+check_eq "$_got" "" "silent: -s produces no output"
+check_exit "silent: -s sh exits 0" 0 $WHICH -s sh
+check_exit "silent: -s nonexistent exits 1" 1 $WHICH -s this_command_does_not_exist_xyz
+
+# --- -a (all matches) ---
+# Create a temp dir with a duplicate "testprog" and prepend it to PATH
+mkdir -p bin1 bin2
+printf '#!/bin/sh\n' > bin1/testprog
+printf '#!/bin/sh\n' > bin2/testprog
+chmod +x bin1/testprog bin2/testprog
+_old_path="$PATH"
+PATH="$(pwd)/bin1:$(pwd)/bin2:$PATH"
+export PATH
+
+# Without -a, should find exactly 1
+_count="$($WHICH testprog 2>/dev/null | wc -l | tr -d ' ')"
+check_eq "$_count" "1" "allpaths: default finds 1"
+
+# With -a, should find at least 2
+_count="$($WHICH -a testprog 2>/dev/null | wc -l | tr -d ' ')"
+if [ "$_count" -ge 2 ]; then
+    pass "allpaths: -a finds multiple"
+else
+    fail "allpaths: -a finds multiple" "got $_count matches"
+fi
+
+PATH="$_old_path"
+export PATH
+
+# --- multiple arguments ---
+$WHICH sh cat > multi_out 2>/dev/null
+_lines=$(wc -l < multi_out | tr -d ' ')
+check_eq "$_lines" "2" "multi: two args produce two lines"
+
+# --- absolute path passthrough ---
+_got="$($WHICH /bin/sh 2>/dev/null)"
+if [ "$_got" = "/bin/sh" ] || [ "$_got" = "" ]; then
+    # FreeBSD which passes through absolute paths if executable
+    if [ -x /bin/sh ]; then
+        check_eq "$_got" "/bin/sh" "absolute: /bin/sh passes through"
+    else
+        pass "absolute: /bin/sh not executable (skip)"
+    fi
+else
+    fail "absolute: /bin/sh passes through" "got: $_got"
+fi
+
+# --- no args prints usage and exits 1 ---
+$WHICH >/dev/null 2>&1
+_rc=$?
+check_eq "$_rc" "1" "usage: no args exits 1"
+
+summary