native-deep: first-run findings (coverage time, affinity tests under ASan, coverage-labels test) #769

The first run of the weekly report-only `native-deep.yml` workflow (from #762, run 43171495302) completed, with these findings to triage:

• Coverage job time. The instrumented pytest took 2 h 25 min against the job's 240-minute timeout, which leaves little margin. Options: shard it, or cover the native tests plus a targeted Python subset.
• Affinity tests under ASan and coverage. `test_the_process_pool_follows_the_affinity_mask` fails (`assert 1 == 2`) in both the extension-asan and the coverage jobs. It is probably the setarch/ASan environment narrowing CPU affinity. Either skip the test there with a stated reason, or widen the mask.
• Coverage-labels test. `test_coverage_labels.py::test_label_collector_counts_concurrent_calls_and_escapes` raises StopIteration only in the coverage build.
• Results to triage:
  • include-cleaner report (24 KB artifact);
  • coverage totals of about 76 % lines, 81 % functions and 76 % regions. Its dead-code list feeds the lean-plan native structure PR.
• Trigger. The workflow also runs on a pull request that changes the workflow file itself. Keep that trigger, or drop it.

🤖 Generated with Claude Code