[autodev] fix csv_reporter --csv collision with pytest-csv

Subprocess-spawned tests in e2e/_unit_tests/reporting/ crashed with
"argparse.ArgumentError: argument --csv: conflicting option string: --csv"
because pytest-csv (autoloaded via entry-point) and our custom plugin both
register --csv. pytest's option registry does not allow overrides.

Fix: drop pytest-csv from e2e/runner/requirements.txt. It was unused, dead
weight, and incompatible with pytest 9.x (uses removed hookwrapper marker).
Update conftest + csv_reporter comments to match.

After fix: 1229/1229 in e2e/_unit_tests pass.

Bug ticket creation deferred (user skipped interactive Q this session) —
payload recorded in _docs/_process_leftovers/2026-05-17_csv_reporter_*.md
for replay on next /autodev.

Co-authored-by: Cursor <cursoragent@cursor.com>

e2e/runner/conftest.py

@@ -206,8 +206,10 @@ def mock_suite_sat_url() -> str:
 
 # The CSV reporter plugin is a separate module so the unit tests can exercise
 # it directly without going through a real pytest run. It is registered via
-# `pytest_plugins` so docker-compose's `--csv=...` flag binds to our column
-# set rather than the upstream pytest-csv default.
+# `pytest_plugins` to provide the `--csv` / `--csv-columns` CLI surface used
+# by docker-compose. The upstream `pytest-csv` package is intentionally NOT a
+# dependency — its `--csv` flag would conflict with ours (pytest does not
+# allow option overrides) and it is incompatible with pytest 9.x.
 pytest_plugins = [
     "runner.reporting.csv_reporter",
     "runner.reporting.evidence_bundler",

e2e/runner/reporting/csv_reporter.py

@@ -6,12 +6,14 @@ Emits one row per test with the exact columns declared in
     test_id, test_name, traces_to, fc_adapter, vio_strategy, tier,
     started_at_utc, execution_time_ms, result, error_message, evidence_paths
 
-Why a custom plugin rather than `pytest-csv` defaults?
-    - `pytest-csv` is dependency-installed for its column-extension hooks, but
-      its default emission is `name`/`status`/`duration` — our matrix needs the
-      `traces_to`, `fc_adapter`, `vio_strategy`, `tier`, `started_at_utc`,
-      `evidence_paths` columns to feed the downstream badge generator and
-      regression detector.
+Why a custom plugin rather than `pytest-csv`?
+    - `pytest-csv`'s default emission is `name`/`status`/`duration`; our matrix
+      needs the `traces_to`, `fc_adapter`, `vio_strategy`, `tier`,
+      `started_at_utc`, `evidence_paths` columns to feed the downstream badge
+      generator and regression detector.
+    - pytest's option registry does not allow override of an already-registered
+      flag, so this plugin owns `--csv` exclusively — `pytest-csv` is NOT a
+      dependency (and is incompatible with pytest 9.x anyway).
 
 Result classification per AC-9:
     - PASS / FAIL / SKIP map 1:1 to pytest's own outcome.

e2e/runner/requirements.txt

@@ -5,13 +5,17 @@
 #     depend on gtsam — the numpy<2 ABI block that forces the SUT pin does not
 #     apply here; see _docs/_process_leftovers/2026-05-11_d_cross_cve_1_opencv_pin_deferred.md).
 #   - Versions match the SUT pyproject where feasible (numpy 1.x line, pyproj 3.6+, pydantic 2.x).
-#   - pytest 8.x is the stable line; pytest-csv 3.x supplies the columns the CSV reporter plugin extends.
+#   - pytest 8.x is the stable line. We do NOT depend on pytest-csv: an earlier
+#     design considered extending its column hooks, but our custom
+#     `runner.reporting.csv_reporter` plugin owns the `--csv` / `--csv-columns`
+#     CLI surface end-to-end and pytest-csv 3.x conflicts on the flag name and
+#     is also incompatible with pytest 9.x (uses the removed `hookwrapper`
+#     marker). Keep it out of the image.
 
 pytest>=8.0,<9.0
 pytest-timeout>=2.2,<3.0
 pytest-xdist>=3.5,<4.0
 pytest-forked>=1.6,<2.0
-pytest-csv>=3.0,<4.0
 
 # MAVLink ground side — used for both AP signing-handshake assertions and the
 # passive listener that consumes mavproxy-listener's forwarded UDP stream.