Merge branch 'develop'

Includes security fixes, bug fixes, and code quality refactors:
- Fix command injection in DNFPackageManager (system() multi-arg form)
- Fix backup_resursively! typo (latent NoMethodError)
- Add error handling to DNFPackageManager (CommandFailed + run_dnf!)
- Split file.rb monolith into per-class files
- Extract DryRun concern (SRP), narrow BasicFile interface (ISP)
- Extract register_keyword DSL helper (DRY)
- Replace ObjectSpace scan with inherited-hook class registry
- Defer Options.parse! and Config.load! to application entry point
- Add Justfiles to all example directories

5 files changed, 59 insertions, 1 deletions

diff --git a/examples/cli/Justfile b/examples/cli/Justfile
new file mode 100644
index 0000000..4c81601
--- /dev/null
+++ b/examples/cli/Justfile
@@ -0,0 +1,17 @@
+rcm := "../../bin/rcm"
+
+# Apply configuration
+run:
+    {{rcm}} config.rb
+
+# Dry run — show what would change without making changes
+dry:
+    {{rcm}} config.rb --dry
+
+# Verbose output
+debug:
+    {{rcm}} config.rb --debug
+
+# Limit execution to specific hosts (comma-separated, e.g. just hosts earth,mars)
+hosts target:
+    {{rcm}} config.rb --hosts {{target}}
diff --git a/examples/gem/Gemfile.lock b/examples/gem/Gemfile.lock
index 502fccc..f426524 100644
--- a/examples/gem/Gemfile.lock
+++ b/examples/gem/Gemfile.lock
@@ -1,7 +1,7 @@
 PATH
   remote: ../..
   specs:
-    rcm (0.1.0)
+    rcm (0.1.1)
       erb
       toml (~> 0.3)
 
diff --git a/examples/gem/Justfile b/examples/gem/Justfile
new file mode 100644
index 0000000..005267f
--- /dev/null
+++ b/examples/gem/Justfile
@@ -0,0 +1,15 @@
+# Install gem dependencies
+setup:
+    bundle install
+
+# Apply configuration
+run:
+    bundle exec ruby config.rb
+
+# Dry run — show what would change without making changes
+dry:
+    bundle exec ruby config.rb --dry
+
+# Verbose output
+debug:
+    bundle exec ruby config.rb --debug
diff --git a/examples/plain_ruby/Justfile b/examples/plain_ruby/Justfile
new file mode 100644
index 0000000..c758519
--- /dev/null
+++ b/examples/plain_ruby/Justfile
@@ -0,0 +1,11 @@
+# Apply configuration
+run:
+    ruby config.rb
+
+# Dry run — show what would change without making changes
+dry:
+    ruby config.rb --dry
+
+# Verbose output
+debug:
+    ruby config.rb --debug
diff --git a/examples/rake/Justfile b/examples/rake/Justfile
new file mode 100644
index 0000000..e25852a
--- /dev/null
+++ b/examples/rake/Justfile
@@ -0,0 +1,15 @@
+# Install gem dependencies
+setup:
+    bundle install
+
+# Apply configuration
+run:
+    rake setup
+
+# Dry run — show what would change without making changes
+dry:
+    rake setup -- --dry
+
+# Verbose output
+debug:
+    rake setup -- --debug