Enable scenario calls in Background sections

[Copilot]

Background sections can now expand scenario calls, both within the same feature and across features.

Changes

Core Generator (ScenarioCallFeatureGenerator.cs)

• Extended PreprocessFeatureContent to detect and expand scenario calls in Background: sections using Gherkin's BackgroundKeywords
• Renamed tracking variables from inScenario to inScenarioOrBackground for clarity

Tests (ScenarioCallFeatureGeneratorSimpleTests.cs)

• Updated existing Background test to verify expansion (was testing non-expansion)
• Added coverage for: same-feature calls, cross-feature calls, multiple calls, expansion ordering, and shared backgrounds

Documentation (README.md)

• Removed Background limitation from documented constraints

Example

Feature: User Management
Background:
    Given I call scenario "Setup" from feature "Common"

Scenario: Create User
    When I create a user
    Then the user exists

The Background scenario call now expands inline before each scenario, equivalent to:

Background:
    # Expanded from scenario call: "Setup" from feature "Common"
    Given the database is initialized
    And the test user is created

Original prompt

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This section details on the original issue you should resolve

<issue_title>Allow scenario calls from Background sections (including across features)</issue_title>
<issue_description>It is currently not possible to call a scenario defined in another feature file from within a Background section.

Current situation:

• This is documented as a limitation: scenario calls in Background sections are not expanded.
  • README limitations:
    https://github.com/jgerits/Reqnroll.ScenarioCall.Generator/blob/main/README.md#L292-L323
• There is also a test verifying that scenario calls in Background are not expanded:
  https://github.com/jgerits/Reqnroll.ScenarioCall.Generator/blob/main/Reqnroll.ScenarioCall.Generator.Tests/ScenarioCallFeatureGeneratorSimpleTests.cs#L418-L444

Expected functionality:

• Scenario calls should be expanded inside Background sections as well, not only inside Scenario sections.
• This should work both:
  • within the same feature file, and
  • across feature files.

Implementation hint:

• Extend preprocessing so that it scans and expands scenario call lines inside Background blocks too.
• Add tests for:
  • correct expansion order (Background steps first, then Scenario steps),
  • cross-feature background calls,
  • recursion protection (Background -> Scenario -> Background …).</issue_description>

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

• Fixes Allow scenario calls from Background sections (including across features) #27

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