fix(tests): update xlings path assertions for registry/bin/ layout

Tests 10 and 27 checked for xlings at $MCPP_HOME/bin/xlings; the
0.0.4 layout moved it to $MCPP_HOME/registry/bin/xlings.

Author: Sunrisepeak

tests/e2e/10_env_command.sh

@@ -17,7 +17,7 @@ out=$("$MCPP" self env 2>&1)
 [[ -d "$MCPP_HOME/cache" ]]    || { echo "missing cache/"; exit 1; }
 [[ -f "$MCPP_HOME/config.toml" ]]            || { echo "missing config.toml"; exit 1; }
 [[ -f "$MCPP_HOME/registry/.xlings.json" ]]  || { echo "missing seeded .xlings.json"; exit 1; }
-[[ -x "$MCPP_HOME/bin/xlings" ]] || { echo "xlings binary not acquired"; exit 1; }
+[[ -x "$MCPP_HOME/registry/bin/xlings" ]] || { echo "xlings binary not acquired"; exit 1; }
 
 # Verify seeded .xlings.json contains mcpp-index and NOT awesome
 grep -q '"name": "mcpp-index"' "$MCPP_HOME/registry/.xlings.json" || {

tests/e2e/27_self_contained_home.sh

@@ -26,7 +26,7 @@ echo "$out" | grep -q "MCPP_HOME *= *$ROOT" || {
 # And it must have actually populated the layout there.
 [[ -d "$ROOT/registry" ]]            || { echo "missing registry/"; exit 1; }
 [[ -f "$ROOT/config.toml" ]]         || { echo "missing config.toml"; exit 1; }
-[[ -x "$ROOT/bin/xlings" ]]          || { echo "xlings not acquired into $ROOT/bin"; exit 1; }
+[[ -x "$ROOT/registry/bin/xlings" ]]  || { echo "xlings not acquired into $ROOT/registry/bin"; exit 1; }
 
 # Explicit env var must still win when set.
 ALT="$TMP/explicit-home"