chore(build): add static library output and privilege-safe install

- debug and release targets now produce both shared and static libs
- obj dirs split into shared/ and static/ to keep fPIC objects isolated
- install no longer depends on release, guards with existence check instead
- build.sh handles privilege escalation for install/uninstall via doas or
  sudo, falling back gracefully if already root
- uninstall cleans up static lib alongside shared

build.sh

@@ -8,4 +8,32 @@ else
 	MK_FILE="bmake.mk"
 fi
 
-make -f "$MK_FILE" "$@"
+HAS_INSTALL=0
+HAS_UNINSTALL=0
+for arg in "$@"; do
+	case "$arg" in
+		install)   HAS_INSTALL=1 ;;
+		uninstall) HAS_UNINSTALL=1 ;;
+	esac
+done
+
+if [ "$HAS_INSTALL" = "1" ] || [ "$HAS_UNINSTALL" = "1" ]; then
+	if [ "$HAS_INSTALL" = "1" ]; then
+		make -f "$MK_FILE" release
+	fi
+
+	if [ "$(id -u)" = "0" ]; then
+		PRIV=""
+	elif command -v doas > /dev/null 2>&1; then
+		PRIV="doas"
+	elif command -v sudo > /dev/null 2>&1; then
+		PRIV="sudo"
+	else
+		echo "error: install requires root. neither doas nor sudo found." >&2
+		exit 1
+	fi
+
+	$PRIV make -f "$MK_FILE" "$@"
+else
+	make -f "$MK_FILE" "$@"
+fi