Modernized build tooling

features/cli.feature

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+Feature: Command-line greeting interface
+  As a user of the boilerplate CLI
+  I want to be greeted properly
+  So that I can verify the application works
+
+  Background:
+    Given the CLI is available
+
+  Scenario: Default greeting
+    When I run "python -m boilerplate"
+    Then the exit code should be 0
+    And the output should contain "Hello, World!"
+
+  Scenario: Custom name greeting
+    When I run "python -m boilerplate --name Alice"
+    Then the exit code should be 0
+    And the output should contain "Hello, Alice!"
+
+  Scenario: Multiple greetings
+    When I run "python -m boilerplate --count 3"
+    Then the exit code should be 0
+    And the output should contain "Hello, World!" 3 times
+
+  Scenario Outline: Greeting various names
+    When I run "python -m boilerplate --name <name>"
+    Then the exit code should be 0
+    And the output should contain "Hello, <name>!"
+
+    Examples:
+      | name    |
+      | Bob     |
+      | Charlie |
+      | 世界    |
+      | 🎉      |
+
+  @hypothesis
+  Scenario: Fuzz test greeting names
+    When I fuzz test the CLI with random names
+    Then all invocations should succeed