tests/docs: unique-name driver loading; moving-path lifecycle and settings notes; VIV predeclare renamed

Tests load research drivers via importlib under unique module names
instead of a bare 'import run' (shared-process collision between the
Dütsch and VIV drivers). lifecycle.md qualifies immutable geometry and the
host-only get_flags for translating circles; supported_settings.md points to
the dense-only moving-circle feature; leontini_viv_predeclare.md is renamed
viv_re150_predeclare.md (Re 150 Kolahdouz/Qin case) with references updated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

tests/unit/test_duetsch_protocol.py

@@ -11,6 +11,20 @@ _spec = importlib.util.spec_from_file_location(
 p = importlib.util.module_from_spec(_spec)
 _spec.loader.exec_module(p)
 
+def _load(rel, name):
+    """Load a research driver module under a unique name (no bare ``import run``)."""
+    import sys
+    path = Path(__file__).resolve().parents[2] / rel
+    sys.path.insert(0, str(path.parent))  # for the driver's own sibling imports
+    try:
+        spec = importlib.util.spec_from_file_location(name, path)
+        mod = importlib.util.module_from_spec(spec)
+        spec.loader.exec_module(mod)
+    finally:
+        sys.path.remove(str(path.parent))
+    return mod
+
+
 T = 2520
 
 
@@ -93,12 +107,7 @@ def test_exact_point_inside_body_is_missing_even_with_fluid_corners():
 
 def test_generated_config_passes_the_real_loader(tmp_path):
     import json
-    import sys
-    sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "research/duetsch_re100_kc5"))
-    try:
-        import run
-    finally:
-        sys.path.pop(0)
+    run = _load("research/duetsch_re100_kc5/run.py", "duetsch_run")
     from CelerisLab.config import load_lbm_config
     cfg_dict, u_max, n = run.config(20, 10.0, 2520)
     path = tmp_path / "config_lbm.json"
@@ -111,13 +120,7 @@ def test_generated_config_passes_the_real_loader(tmp_path):
 
 
 def _analyze():
-    import sys
-    sys.path.insert(0, str(Path(__file__).resolve().parents[2] / "research/duetsch_re100_kc5"))
-    try:
-        import analyze
-    finally:
-        sys.path.pop(0)
-    return analyze
+    return _load("research/duetsch_re100_kc5/analyze.py", "duetsch_analyze")
 
 
 def test_hf_energy_is_parseval_weighted():