mruby-io: migrate HAL to ports/ directories

Move hal-posix-io and hal-win-io into mruby-io/ports/posix/ and
mruby-io/ports/win/. Platform sources are now compiled
automatically based on conf.ports setting. Remove HAL
auto-detection logic from mrbgem.rake.

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

mrbgems/hal-posix-io/mrbgem.rake

@@ -1,8 +0,0 @@
-MRuby::Gem::Specification.new('hal-posix-io') do |spec|
-  spec.license = 'MIT'
-  spec.author  = 'mruby developers'
-  spec.summary = 'POSIX HAL for mruby-io (Linux, macOS, BSD, Unix)'
-
-  # HAL gem depends on feature gem - brings in mruby-io automatically
-  spec.add_dependency 'mruby-io', core: 'mruby-io'
-end

mrbgems/hal-win-io/mrbgem.rake

@@ -1,11 +0,0 @@
-MRuby::Gem::Specification.new('hal-win-io') do |spec|
-  spec.license = 'MIT'
-  spec.author  = 'mruby developers'
-  spec.summary = 'Windows HAL for mruby-io (Windows, MinGW)'
-
-  # HAL gem depends on feature gem - brings in mruby-io automatically
-  spec.add_dependency 'mruby-io', core: 'mruby-io'
-
-  # Link Windows socket library
-  spec.linker.libraries << "ws2_32"
-end

mrbgems/mruby-io/mrbgem.rake

@@ -5,30 +5,4 @@ MRuby::Gem::Specification.new('mruby-io') do |spec|
 
   spec.build.defines << "HAVE_MRUBY_IO_GEM"
   spec.add_test_dependency 'mruby-time', core: 'mruby-time'
-
-  # 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-.*-io$/ } or begin
-    # No HAL found - determine appropriate error message or auto-load
-    suggested_hal = if spec.for_windows?
-      'hal-win-io'
-    elsif RUBY_PLATFORM =~ /linux|darwin|bsd/
-      'hal-posix-io'
-    else
-      nil
-    end
-
-    if suggested_hal
-      # Auto-load HAL gem for convenience (for development)
-      # This works because HAL gems declare dependency on mruby-io
-      warn "mruby-io: No HAL specified, loading #{suggested_hal} (explicit selection recommended)"
-      spec.build.gem core: suggested_hal
-    else
-      # Unknown platform - fail with helpful message
-      fail "mruby-io: No HAL available for platform '#{RUBY_PLATFORM}'.\n" \
-           "Please specify HAL gem explicitly in your build config:\n" \
-           "  conf.gem core: 'hal-posix-io'   # For Linux/macOS/BSD\n" \
-           "  conf.gem core: 'hal-win-io'     # For Windows"
-    end
-  end
 end

mrbgems/mruby-io/ports/posix/io_hal.c

@@ -571,21 +571,3 @@ mrb_hal_io_final(mrb_state *mrb)
   (void)mrb;
   /* No special cleanup needed for POSIX */
 }
-
-/*
- * Gem initialization
- */
-
-void
-mrb_hal_posix_io_gem_init(mrb_state *mrb)
-{
-  (void)mrb;
-  /* HAL interface functions are called by mruby-io gem */
-}
-
-void
-mrb_hal_posix_io_gem_final(mrb_state *mrb)
-{
-  (void)mrb;
-  /* Cleanup handled by mrb_hal_io_final called from mruby-io */
-}

mrbgems/mruby-io/ports/win/io_hal.c

@@ -618,21 +618,3 @@ mrb_hal_io_final(mrb_state *mrb)
   /* Cleanup Winsock */
   WSACleanup();
 }
-
-/*
- * Gem initialization
- */
-
-void
-mrb_hal_win_io_gem_init(mrb_state *mrb)
-{
-  (void)mrb;
-  /* HAL interface functions are called by mruby-io gem */
-}
-
-void
-mrb_hal_win_io_gem_final(mrb_state *mrb)
-{
-  (void)mrb;
-  /* Cleanup handled by mrb_hal_io_final called from mruby-io */
-}