Issue #130: Ignore test-generated artifacts; add session notes

Running the full suite while diagnosing the pre_push_check hang showed the
benchmark tests in tests/real_world/ write performance_test_results/ into
the repo root, which was not ignored. coverage_detailed_report.txt was
untracked for the same reason.

Notes record the measured before/after, the two things the handoff plan did
not anticipate, and what was deliberately left open (#133, #110, #117).

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_012gTBDPK16HUZ3kHQ2QyjuU

Author: jeremymanning

.gitignore

@@ -26,8 +26,11 @@ test-reports/
 .coverage
 .coverage.*
 coverage.json
+coverage_detailed_report.txt
 htmlcov/
 .tox/
+# Written by the benchmark tests in tests/real_world/ at run time.
+performance_test_results/
 
 # Personal configuration files
 clustrix.yml

notes/session_130_pytest_config_execution.md

@@ -0,0 +1,112 @@
+# Session log: executing the #130 plan
+
+**Date:** 2026-08-17 · **Branch:** `fix/130-pytest-config` · **Base:** `master` @ `a9393b7`
+**Plan followed:** `notes/handoff_130_pytest_config.md`
+
+Every command below was run in a throwaway venv, since the repo has no usable
+one by default (#110):
+
+```bash
+python3 -m venv /tmp/v130 && /tmp/v130/bin/pip install -e ".[dev]"
+```
+
+`scripts/pre_push_check.py` shells out to bare `pytest`/`mypy`/`flake8` from
+`PATH`, so it must be run as
+`PATH="/tmp/v130/bin:$PATH" /tmp/v130/bin/python scripts/pre_push_check.py`.
+Running it with the venv interpreter alone is not enough and fails with
+`ModuleNotFoundError: paramiko`.
+
+## What landed, in order
+
+| Commit | Step | What |
+|-|-|-|
+| `9c18cb3` | 0.5 | Cleared 6 collection errors blocking Step 4 |
+| `176d87e` | 5 (first) | Regression tests, TDD red |
+| `9c85296` | 1 | Guard reads argv, not resolved testpaths |
+| `d1d6090` | 2 | Deleted pytest.ini; `testpaths = ["tests"]` |
+| `6d39bd4` | 3 | Registered all 7 markers; dropped `cleanup` |
+| `d93f933` | 4 | Enabled `--strict-markers` |
+| `43e7bf3` | 6 | MIGRATION.md + prime.md |
+| `14222d0` | 6 | pre_push_check runs CI's test command |
+
+## Things the plan did not anticipate
+
+**Step 0 baseline had 6 collection errors.** The plan said to record the
+number; it did not say the number came with errors attached. They had to be
+fixed before Step 4 could be verified at all, because Step 4's gate is
+"0 errors under `--strict-markers`".
+
+- `tests/real_world/test_container_registry_comprehensive.py:571` had a
+  backslash inside an f-string expression — a `SyntaxError` on every Python
+  before 3.12, while `requires-python` says `>=3.8`. An AST parse over all of
+  `tests/` and `clustrix/` confirmed it was the only one in the tree.
+- `numpy` and `pandas` were undeclared but imported at module scope by five
+  modules. Added to the `[dev]` extra.
+
+Result: 1214 collected + 6 errors → 1275 collected + 0 errors.
+
+**The plan's own regression test needed correcting.** It proposed asserting
+`pytestconfig.inipath.name == "pyproject.toml"`, which is right, but the
+docstring I first wrote for the bare-pytest guard test overclaimed. Measured:
+
+| guard reads | testpaths | bare pytest |
+|-|-|-|
+| `invocation_params.args` | `["tests"]` | ok |
+| `invocation_params.args` | `["tests/unit","tests/integration"]` | ok |
+| `config.args` | `["tests"]` | ok |
+| `config.args` | `["tests/unit","tests/integration"]` | **REFUSED** |
+
+So the two fixes are each independently sufficient, and the test guards the
+*combination*. Both are kept as belt and braces, and the table is recorded in
+the test's docstring.
+
+**`--strict-markers` needs care with `-o addopts=`.** It reaches pytest through
+`addopts`, so `test_strict_markers_is_active` skips when
+`config.option.override_ini` contains an `addopts=` entry. Verified against
+pytest 8.4.2: that attribute holds `['addopts=']`.
+
+**`pre_push_check.py` ran a bare `pytest`.** Harmless only while no config was
+effective. Once `testpaths` went live it resolved to all 1670 tests including
+the 224 network-bound ones in `tests/real_world/`, and stopped terminating. It
+also left artifacts behind: it modified checked-in files under
+`tests/real_world/screenshots/` and created an untracked
+`performance_test_results/`. Now runs `pytest tests/unit/ -m "not real_world"`,
+matching `.github/workflows/tests.yml`; the generated paths are gitignored.
+
+## Definition of done — measured
+
+```
+configfile                                       pyproject.toml
+shadowing config files in repo                   0
+bare pytest                                      1670 collected, no abort
+pytest tests/integration/<file>                  refused (#109 holds)
+tests/ -m "not real_world" integration node IDs  0
+markers registered                               7 / 7
+collection errors under --strict-markers         0
+tests/unit/                                      75 passed
+fresh venv, [dev] only, pytest tests/ --co       1670 collected, 0 errors
+```
+
+## Left open deliberately
+
+**#133 (filed).** `scripts/pre_push_check.py` still cannot exit 0: flake8
+reports 92 findings on `master` (91 on this branch). CI runs the identical
+flake8 command with `--exit-zero`, so it has never been green anywhere. 75 are
+`E402` from deliberate `sys.path` setup. The rest are not stylistic — the
+notable one is `tests/integration/test_direct_gpu_detection.py:42`, which
+builds a remote Python program inside an f-string without escaping its braces,
+so `{torch.__version__}`, `{i}`, `{props.name}`, `{e}` are interpolated in the
+*local* scope and the module raises `NameError` before the subprocess starts.
+It survives because the #109 guard keeps `tests/integration/` out of CI.
+
+Not folded into this PR: different concern, gated directory, and it would bury
+the #130 change.
+
+**#110 corrected**, not closed. Its `addopts`/xdist premise quoted the epic
+branch, not `master`, and its `sklearn` collection-error claim is wrong (every
+`sklearn` import under `tests/` is inside a function body). Two of its
+acceptance criteria are now met. Comment:
+https://github.com/ContextLab/clustrix/issues/110#issuecomment-5317453905
+
+**#117** untouched, as instructed — `tests/real_world/conftest.py:223` still
+calls `is_dartmouth_network()` at collection time.