Feature: Application Container coverage boost for _build_checkpoint_service and _build_trace_service
  As a developer
  I want to exercise the _build_checkpoint_service and _build_trace_service helper functions
  So that lines 187-195 and 204-211 of container.py are covered by tests

  Background:
    Given a clean container state for coverage boost tests

  # -----------------------------------------------------------------
  # _build_checkpoint_service  (lines 187-195)
  # -----------------------------------------------------------------

  Scenario: Build checkpoint service with in-memory database and no lifecycle service
    When I build a checkpoint service with an in-memory database URL
    Then the result should be a CheckpointService instance
    And the checkpoint service should have a repository
    And the checkpoint service should have no plan lifecycle service

  Scenario: Build checkpoint service with an explicit plan lifecycle service
    Given a mock plan lifecycle service
    When I build a checkpoint service with the mock plan lifecycle service
    Then the result should be a CheckpointService instance
    And the checkpoint service should reference the mock plan lifecycle service

  # -----------------------------------------------------------------
  # _build_trace_service  (lines 204-211)
  # -----------------------------------------------------------------

  Scenario: Build trace service with in-memory database using default settings
    When I build a trace service with an in-memory database URL and no explicit settings
    Then the result should be a TraceService instance
    And the trace service should have a repository
    And the trace service should have resolved settings from defaults

  Scenario: Build trace service with explicit settings
    Given explicit application settings for trace service
    When I build a trace service with the explicit settings
    Then the result should be a TraceService instance
    And the trace service should use the explicitly provided settings