* test(integration): stop GET /__observations from draining the upstream log
GET /__observations used to empty the queue, so a second read in a test
saw nothing and a "never reached upstream" check could pass whether or not
the request was forwarded. GET now returns every request since the last
reset and DELETE /__observations is the reset. An autouse fixture resets
the worker upstream before each test, which also covers tests that read
without the gateway fixture.
Discarded reads used as resets become DELETEs, helpers that accumulated
drained reads now read one snapshot, and tests with several phases reset
between them. The three vacuous negative checks (rag allowlist, guardrail
opt-out chaos, xAI batch output) now assert the absence on the same read
that shows a request which did reach the upstream.
* style(integration): space the observations unit test like its neighbours
tests/integration/conftest.py imported the bare `integration` package. Because
tests/__init__.py and tests/integration/__init__.py both exist, pytest's default
prepend import mode puts only the repo root on sys.path, so that name resolved
only under the PYTHONPATH that tests/integration/run.py injects. Every other
invocation died at conftest import with
ModuleNotFoundError: No module named 'integration' and exit 4, including the
command test_oci_integration.py documents in its own docstring.
The imports now use the tests.integration._support path that pytest actually
resolves, matching the 120 other `from tests.` imports in the suite. run.py's
PYTHONPATH still works because it already puts the repo root on the path.
tests/code_coverage_tests/test_integration_suite_imports.py collects every file
under tests/integration with PYTHONPATH scrubbed and asserts a non-zero
collection count, so an unresolvable import fails the code-quality job instead
of only the developers who run these files by hand. CI runs the three
pre-existing files through the allowlist rather than executing them, which is
why nothing caught this.
