mruby-dir: migrate HAL to ports/ directories

Move hal-posix-dir and hal-win-dir into mruby-dir/ports/posix/
and mruby-dir/ports/win/. Remove HAL auto-detection logic from
mrbgem.rake.

Co-authored-by: Claude <noreply@anthropic.com>

mrbgems/hal-posix-dir/mrbgem.rake

@@ -1,7 +0,0 @@
-MRuby::Gem::Specification.new('hal-posix-dir') do |spec|
-  spec.license = 'MIT'
-  spec.authors = 'mruby developers'
-  spec.summary = 'POSIX HAL for mruby-dir (Linux, macOS, BSD, Unix)'
-
-  spec.add_dependency 'mruby-dir', core: 'mruby-dir'
-end

mrbgems/hal-win-dir/mrbgem.rake

@@ -1,7 +0,0 @@
-MRuby::Gem::Specification.new('hal-win-dir') do |spec|
-  spec.license = 'MIT and MIT-like license'
-  spec.authors = ['mruby developers', 'Kevlin Henney']
-  spec.summary = 'Windows HAL for mruby-dir'
-
-  spec.add_dependency 'mruby-dir', core: 'mruby-dir'
-end

mrbgems/mruby-dir/mrbgem.rake

@@ -1,35 +1,4 @@
 MRuby::Gem::Specification.new('mruby-dir') do |spec|
   spec.license = 'MIT and MIT-like license'
   spec.authors = ['Internet Initiative Japan Inc.', 'Kevlin Henney']
-
-  # Check if HAL gem is loaded
-  # HAL gems must be explicitly specified in build config (recommended) or via auto-selection below
-  spec.build.gems.one? { |g| g.name =~ /^hal-.*-dir$/ } or begin
-    # No HAL found - determine appropriate error message or auto-load
-    suggested_hal = if ENV['MRUBY_DIR_HAL']
-      ENV['MRUBY_DIR_HAL']
-    elsif spec.for_windows?
-      'hal-win-dir'
-    elsif RUBY_PLATFORM =~ /linux|darwin|bsd/
-      'hal-posix-dir'
-    else
-      nil
-    end
-
-    if suggested_hal
-      # Auto-load HAL gem for convenience (for development)
-      # This works because HAL gems declare dependency on mruby-dir
-      warn "mruby-dir: No HAL specified, loading #{suggested_hal} (explicit selection recommended)"
-      spec.build.gem core: suggested_hal
-    else
-      # Unknown platform - fail with helpful message
-      fail "mruby-dir: No HAL available for platform '#{RUBY_PLATFORM}'.\n" \
-           "Please specify HAL gem explicitly in your build config:\n" \
-           "  conf.gem core: 'hal-posix-dir'   # For Linux/macOS/BSD\n" \
-           "  conf.gem core: 'hal-win-dir'     # For Windows\n" \
-           "Or set environment variable:\n" \
-           "  MRUBY_DIR_HAL=hal-myplatform-dir\n" \
-           "See mrbgems/mruby-dir/README.md for creating custom HAL."
-    end
-  end
 end

mrbgems/mruby-dir/ports/posix/dir_hal.c

@@ -173,21 +173,3 @@ mrb_hal_dir_final(mrb_state *mrb)
   (void)mrb;
   /* No cleanup needed for POSIX */
 }
-
-/*
- * Gem initialization
- */
-
-void
-mrb_hal_posix_dir_gem_init(mrb_state *mrb)
-{
-  (void)mrb;
-  /* HAL interface functions are called by mruby-dir gem */
-}
-
-void
-mrb_hal_posix_dir_gem_final(mrb_state *mrb)
-{
-  (void)mrb;
-  /* Cleanup handled by mrb_hal_dir_final called from mruby-dir */
-}

mrbgems/mruby-dir/ports/win/dir_hal.c

@@ -214,36 +214,3 @@ mrb_hal_dir_final(mrb_state *mrb)
   (void)mrb;
   /* No cleanup needed for Windows */
 }
-
-/*
- * Gem initialization
- */
-
-void
-mrb_hal_win_dir_gem_init(mrb_state *mrb)
-{
-  (void)mrb;
-  /* HAL interface functions are called by mruby-dir gem */
-}
-
-void
-mrb_hal_win_dir_gem_final(mrb_state *mrb)
-{
-  (void)mrb;
-  /* Cleanup handled by mrb_hal_dir_final called from mruby-dir */
-}
-
-/*
-** Portions derived from dirent.c by Kevlin Henney:
-**
-** Copyright Kevlin Henney, 1997, 2003, 2012. All rights reserved.
-**
-** Permission to use, copy, modify, and distribute this software and its
-** documentation for any purpose is hereby granted without fee, provided
-** that this copyright and permissions notice appear in all copies and
-** derivatives.
-**
-** This software is supplied "as is" without express or implied warranty.
-**
-** But that said, if there are any problems please get in touch.
-*/