make rcm usable as a gem from any directory, fix bugs and tests

- Add lib/rcm.rb entry point and bin/rcm CLI executable
- Update gemspec: v0.1.0, proper files list, executables, runtime deps
- Support standalone arg parsing and --hosts filtering in options
- Fix inverted logic and typo in FileBackup#different? (== vs !=, cecksum_b)
- Fix unqualified File.directory? resolving to RCM::File in Directory
- Fix test_chown assertions running before evaluate! creates files
- Add setup to file tests to prevent order-dependent failures

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/test/lib/dslkeywords/file_test.rb b/test/lib/dslkeywords/file_test.rb
index 35a0f21..a290627 100644
--- a/test/lib/dslkeywords/file_test.rb
+++ b/test/lib/dslkeywords/file_test.rb
@@ -12,6 +12,12 @@ class RCMFileTest < Minitest::Test
     FileUtils.rm_r(DIR_PATH) if File.directory?(DIR_PATH)
   end
 
+  # Clean up shared temp file between tests to prevent order-dependent failures
+  def setup
+    File.unlink(FILE_PATH) if File.file?(FILE_PATH)
+    FileUtils.rm_r(DIR_PATH) if File.directory?(DIR_PATH)
+  end
+
   def test_create_file_from_string
     text = 'Hello World!'
     configure_from_scratch do