Windows: product names, the editors, WSL; the Linux page's image step

Assembled from development commit c3c40f6c8fca. Since 830b193: on Windows the
products carry Windows names (ktext.exe, klammertext.dll, document.dll,
reflect.dll) and the console's output code page is UTF-8 for a run; the
editor tooling works on Windows (VS Code, Sublime Text, Vim, with the
interpreter's name chosen by platform) and Notepad++ joins it
(doc/edit/notepadpp: a User Defined Language and two Run-menu commands);
a sixth install page, doc/install/windows_wsl_install.md, for Linux
inside WSL; the Windows page opens with the three routes and gains its
editor section, the PowerShell quoting and Path notes; the Linux page
installs OpenImageIO from the python3-openimageio package and verifies
with kdiag --machine; the README lists all six install pages. Linux and
macOS behaviour is unchanged.

sks/document/Makefile

@@ -12,16 +12,19 @@ LOCAL_CPPFLAGS := -I$(KM) -I$(KS)/kutil -I$(KS)/target
 
 # Shared library location
 LIBDIR := $(K)/lib
-LIBRARY := $(LIBDIR)/libklammertext.so
+LIBRARY := $(LIBDIR)/$(KLAMMERTEXT_LIBFILE)
 
-# Linker flags for document.so
+# The product: document.so, on Windows document.dll (makefile.env's DSO)
+DOCUMENT := document$(DSO)
+
+# Linker flags for the DSO
 DOC_LDFLAGS := $(SHARED) $(EXPORT_DYNAMIC) -Wl,-rpath,'$(ORIGIN)/../../lib' -L$(LIBDIR)
 
 # Local object files
 LOCAL_OBJECTS := document_class.o document_html.o document_latex.o heading.o reference.o
 LOCAL_DEPFILES := document_class.d document_html.d document_latex.d heading.d reference.d document.d
 
-# External object files from sks/ (mac/*.o now in libklammertext.so)
+# External object files from sks/ (mac/*.o now in the shared library)
 SKS_OBJECTS := $(KS)/kutil/kutil.o $(KS)/kutil/klammer_base.o \
                $(KS)/target/html_util.o $(KS)/target/latex_util.o
 
@@ -33,7 +36,7 @@ DEPFLAGS = -MMD -MP -MF $(@:.o=.d)
 .PHONY: all clean deps
 
 # Default target
-all : document.so
+all : $(DOCUMENT)
 
 # Build external dependencies first
 deps :
@@ -45,13 +48,13 @@ deps :
 	@echo Compiling $<
 	$(CXX) -c $(CPPFLAGS) $(LOCAL_CPPFLAGS) $(CXXFLAGS) $(DEPFLAGS) $< -o $@
 
-# Shared object - link against libklammertext.so
-document.so : $(LOCAL_OBJECTS) $(SKS_OBJECTS) $(LIBRARY) document.cpp | deps
+# Shared object - link against the library
+$(DOCUMENT) : $(LOCAL_OBJECTS) $(SKS_OBJECTS) $(LIBRARY) document.cpp | deps
 	$(CXX) $(CPPFLAGS) $(LOCAL_CPPFLAGS) $(CXXFLAGS) $(DOC_LDFLAGS) $(LDFLAGS) \
 		document.cpp -o $@ $(ALL_OBJECTS) $(KLAMMERTEXT_LIB) $(LDLIBS)
 
 clean :
-	rm -f $(LOCAL_OBJECTS) $(LOCAL_DEPFILES) *.so *~
+	rm -f $(LOCAL_OBJECTS) $(LOCAL_DEPFILES) *.so *.dll *~
 	# document_txt.py is imported at render time (2026-09-18), so this
 	# directory now exists here; rm -f refused it and failed every clean.
 	rm -rf __pycache__