- Rename TestResize → TestCompactMaskResize for naming consistency with
  other test classes in test_compact_mask.py
- Add test_join_true_true_junction_no_zero_run targeting the True/True
  boundary merge introduced in the prior fix
- Move _PARALLEL_THRESHOLD to module level alongside _L3_DENSITY_THRESHOLD
- Cap ThreadPoolExecutor max_workers=min(n, os.cpu_count() or 4) to avoid
  thread contention in library code
- Document identity-resize shallow-copy semantics in inline comment

[resolve #3] @Copilot (gh): "TestResize is a very generic class name..."
[resolve #9] /review by sw-engineer: "_PARALLEL_THRESHOLD constant buried in method body"
[resolve #10] /review by sw-engineer: "ThreadPoolExecutor() with no max_workers argument"
[resolve #11] /review by sw-engineer: "identity resize does shallow copy of list(self._rles)"
[resolve #12] /review by qa-specialist: "_rle_join_cols has no test for True/True junction"

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Co-authored-by: Claude Code <noreply@anthropic.com>

…low#2303

- [resolve roboflow#12] add UnReleased entry: with_nms + with_nmm now use OBB IoU when
  data["xyxyxyxy"] present; callers on old AABB path should strip that key;
  threshold values may need recalibration.
  Challenge: evidence=VALID suggestion=VALID resolution=as-suggested

[resolve group] PR roboflow#2303 — item 12

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Co-authored-by: claude[bot] <209825114+claude[bot]@users.noreply.github.com>
Co-authored-by: OpenAI Codex <codex@openai.com>