Add module inclusion support to code completion

[Copilot]

Methods from included modules were not available in completion results. When a class includes a module, completions inside that class should find methods defined in the included module.

Implementation

• Schema: Added included_modules JSON field to scopes table
• Parser: Implemented on_include_command handler to capture and store module names from include statements
• Completion: Added get_included_module_scopes() to resolve included module paths and retrieve their methods for completion
• Tests: Added coverage for simple and nested module inclusion, including parameter preservation

Example

module Foo
  def foo_method(param1)
  end
end

class Bar
  include Foo

  def bar_method
    foo  # now completes to foo_method(param1)
  end
end

Handles both simple (include Foo) and namespaced (include Outer::Inner) module inclusion.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>include should include</issue_title>
<issue_description>When you include a module then the things in that module should be in scope for completion.

For example:

module Foo
  def foo_method
  end
end

class Bar
  include Foo

  def bar_method
    foo # if completion runs here then it should find the foo_method because Foo was included into Bar
  end
end
```</issue_description>

<agent_instructions>* Write a test or two
* Make the test work</agent_instructions>

## Comments on the Issue (you are @copilot in this section)

<comments>
</comments>

• Fixes include should include #138

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