[AZ-178] Add real-video streaming test, update e2e tests, mark task done

- Add tests/test_az178_realvideo_streaming.py: integration test that validates
  frame decoding begins while upload is still in progress using a real video fixture
- Add conftest.py: pytest plugin for per-test duration reporting
- Update e2e tests (async_sse, performance, security, streaming_video_upload, video)
  and run-tests.sh for updated test suite
- Move AZ-178 task to done/; add data/ to .gitignore (StreamingBuffer temp files)
- Update autopilot state to step 12 (Security Audit) for new feature cycle

Made-with: Cursor

conftest.py

@@ -0,0 +1,20 @@
+import pytest
+
+
+@pytest.hookimpl(hookwrapper=True)
+def pytest_runtest_makereport(item, call):
+    outcome = yield
+    report = outcome.get_result()
+    if report.when == "call":
+        report._duration_str = f"{report.duration:.2f}s"
+
+
+def pytest_report_teststatus(report, config):
+    if report.when == "call" and hasattr(report, "_duration_str"):
+        t = report._duration_str
+        if report.passed:
+            return "passed", ".", (f"PASSED ({t})", {"green": True})
+        if report.failed:
+            return "failed", "F", (f"FAILED ({t})", {"red": True})
+        if report.skipped:
+            return "skipped", "s", (f"SKIPPED ({t})", {"yellow": True})