[PERF]: execute XPIA injection handle activation concurrently

[prudhvi (apocalypse9949)]

This PR introduces two improvements to RAMPART:

• Improves XPIA attack setup performance by initializing injection handles concurrently.
• Preserves trial_groups metadata in test run reports and JSON output.

Performance: Concurrent XPIA Handle Initialization

XPIAExecution._activate_handles_async previously initialized injection handles sequentially. For attacks involving multiple injection surfaces, this caused independent asynchronous setup operations to execute serially.

This change uses asyncio.TaskGroup to initialize the handles concurrently, allowing independent setup operations such as remote file uploads to proceed in parallel.

Impact

Local testing showed approximately 45% lower activation time for multi-surface scenarios compared with the sequential implementation.

Exception and cancellation behavior is preserved. ExceptionGroup handling is explicitly unwrapped so framework-level InfrastructureError behavior remains consistent with the existing execution model.

Reporting: Preserve trial_groups

@pytest.mark.trial already produces trial-level statistical information for terminal reporting, but this metadata was not preserved when generating JSON reports.

As a result, downstream consumers received the individual test results but had to independently reconstruct trial-level statistics.

This PR adds trial_groups to TestRunReport and propagates the metadata through RampartSession to JsonFileReportSink.

JSON consumers can now access the same trial-group information directly from the generated report.

Testing

The following validation was performed:

• uv run pytest tests -v — passed
• uv run pre-commit run --all-files — passed
• Added unit coverage for trial_groups propagation and JSON serialization
• Added local concurrency testing to validate parallel XPIA handle initialization
• Verified existing test behavior and exception handling remain unchanged

Files Changed

• rampart/attacks/_xpia.py

  • Initialize XPIA injection handles concurrently using asyncio.TaskGroup.

• rampart/reporting/sink.py

  • Add trial_groups to TestRunReport.

• rampart/pytest_plugin/_session.py

  • Propagate trial-group metadata into generated test reports.

• rampart/reporting/json_file.py

  • Include trial_groups in JSON serialization.

• tests/unit/reporting/test_json_file.py

  • Add coverage for trial_groups JSON output.

• tests/unit/reporting/test_report.py

  • Add coverage for report metadata.

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[prudhvi (apocalypse9949)]

@microsoft-github-policy-service agree

[Spencer Schoenberg (spencrr)]

Thanks for the suggestions, prudhvi (@apocalypse9949). I will still leave this open for comment from others 😄