Rename pathname_builtin.rb to pathname.rb

Rename the builtin Ruby file from pathname_builtin.rb to pathname.rb
and update all references in the build system, documentation, and
source files accordingly.

Also add rb_provide("pathname.rb") to prevent double-loading when
the file is found on the load path via -I.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hsbt

.document

@@ -22,7 +22,7 @@ marshal.rb
 numeric.rb
 nilclass.rb
 pack.rb
-pathname_builtin.rb
+pathname.rb
 ractor.rb
 string.rb
 symbol.rb

common.mk

@@ -1192,7 +1192,7 @@ BUILTIN_RB_SRCS = \
 		$(srcdir)/array.rb \
 		$(srcdir)/hash.rb \
 		$(srcdir)/kernel.rb \
-		$(srcdir)/pathname_builtin.rb \
+		$(srcdir)/pathname.rb \
 		$(srcdir)/ractor.rb \
 		$(srcdir)/symbol.rb \
 		$(srcdir)/timev.rb \

depend

@@ -9715,7 +9715,7 @@ miniinit.$(OBJEXT): {$(VPATH)}numeric.rb
 miniinit.$(OBJEXT): {$(VPATH)}onigmo.h
 miniinit.$(OBJEXT): {$(VPATH)}oniguruma.h
 miniinit.$(OBJEXT): {$(VPATH)}pack.rb
-miniinit.$(OBJEXT): {$(VPATH)}pathname_builtin.rb
+miniinit.$(OBJEXT): {$(VPATH)}pathname.rb
 miniinit.$(OBJEXT): {$(VPATH)}prelude.rb
 miniinit.$(OBJEXT): {$(VPATH)}prism_compile.h
 miniinit.$(OBJEXT): {$(VPATH)}prism_xallocator.h
@@ -11305,7 +11305,7 @@ pathname.$(OBJEXT): {$(VPATH)}missing.h
 pathname.$(OBJEXT): {$(VPATH)}onigmo.h
 pathname.$(OBJEXT): {$(VPATH)}oniguruma.h
 pathname.$(OBJEXT): {$(VPATH)}pathname.c
-pathname.$(OBJEXT): {$(VPATH)}pathname_builtin.rbinc
+pathname.$(OBJEXT): {$(VPATH)}pathname.rbinc
 pathname.$(OBJEXT): {$(VPATH)}ruby.h
 pathname.$(OBJEXT): {$(VPATH)}st.h
 pathname.$(OBJEXT): {$(VPATH)}subst.h

doc/maintainers.md

@@ -50,7 +50,7 @@ consensus on ruby-core/ruby-dev.
 
 * *No maintainer*
 
-#### pathname_builtin.rb, lib/pathname.rb
+#### pathname.rb
 
 * Tanaka Akira ([akr])
 

inits.c

@@ -101,7 +101,7 @@ rb_call_builtin_inits(void)
     BUILTIN(ast);
     BUILTIN(trace_point);
     BUILTIN(pack);
-    BUILTIN(pathname_builtin);
+    BUILTIN(pathname);
     BUILTIN(warning);
     BUILTIN(array);
     BUILTIN(hash);

pathname.c

@@ -97,7 +97,7 @@ path_sub(int argc, VALUE *argv, VALUE self)
     return rb_class_new_instance(1, &str, rb_obj_class(self));
 }
 
-#include "pathname_builtin.rbinc"
+#include "pathname.rbinc"
 
 static void init_ids(void);
 
@@ -120,6 +120,7 @@ InitVM_pathname(void)
     rb_define_method(rb_cPathname, "sub", path_sub, -1);
 
     rb_provide("pathname.so");
+    rb_provide("pathname.rb");
     rb_provide("pathname");
 }