1.1.0 TestBench AI Service

Added

• Minimum TestBench version check: all built-in agents now verify the connected server during
  precheck and fail with 409 Conflict and a localized message if it is older than
  TestBench 4.1.
• check_min_testbench_version(context, conn) helper, available to custom agents. Custom agents
  that support older servers can skip it or check conn.server_version themselves.
• The Defect Explainer now rejects XML-based test object versions. Only JSON-based TOVs are
  supported — either set directly on the TOV or inherited from the project's default exchange
  format.
• TestBench API support for reading project and TOV metadata: get_project_details(),
  get_tov_details() and is_json_based_tov(), backed by the new ProjectDetails, TOVDetails
  and ProjectContext models and the ProjectStatus, ProjectExchangeFormat and
  TOVExchangeFormat enums.
• English and German messages for both new precheck failures.
• Dependabot configuration to keep GitHub Actions up to date.

Changed

• The Defect Explainer reads failure messages and inserts explanations using the data-tb-*
  anchors of the current testbench2robotframework 2.x comment format. Comments written by
  tb2rf 1.1 and older are still handled by a legacy fallback.
• Re-running the Defect Explainer on the same test case now replaces the previous explanation
  instead of appending another one — including when only its heading remained in the stored
  comment.
• LLM output is HTML-escaped before it is written into an execution comment, so explanations
  containing < or & no longer corrupt the comment markup.
• Dependencies now require final releases instead of pre-releases:
  testbench-cli-reporter>=3.0.0,<4.0.0 and testbench2robotframework>=2.0.0,<3.0.0.
• Documentation states the TestBench version requirements per agent and the TOV format
  restriction of the Defect Explainer.

Fixed

• An empty execution comment is no longer replaced by a bare AI disclaimer heading.
• Execution traces passed to the LLM keep table cells on one line and no longer contain
  non-breaking spaces from tb2rf's comment indentation.
• Test cases without an explanation are skipped instead of producing an empty annotation.