fix(tests): floor-check version assertion in test_version_bumped_to_0640

Was `assert soup_cli.__version__ == "0.64.0"` — broke on v0.65.0 bump on CI
across all 9 platform×Python matrix jobs. The test intent is "v0.64.0 has
shipped at least once"; switch to a tuple floor check matching the v0.51 /
v0.54 / v0.57 / v0.60 idiom.

Caught by CI red on v0.65.0 push to main; local pytest passed because we
ran the v0.65 test files in isolation per the Release Checklist Step 4
``pytest --no-cov`` invocation. Lesson: include the full suite in step 4
or grep for ``soup_cli.__version__ ==`` exact-equality assertions in any
future version bump.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

tests/test_v0640_part_a.py

@@ -678,7 +678,12 @@ def test_cli_registers_tunability():
 def test_version_bumped_to_0640():
     import soup_cli
 
-    assert soup_cli.__version__ == "0.64.0"
+    # Floor check so future minor releases don't regress this test (matches
+    # v0.51.0 / v0.54.0 / v0.57.0 / v0.60.0 floor-check idiom). Exact-equality
+    # at "0.64.0" broke on the v0.65.0 bump — the test name preserves the
+    # intent (≥0.64.0 means v0.64.0 shipped).
+    parts = tuple(int(p) for p in soup_cli.__version__.split(".")[:3])
+    assert parts >= (0, 64, 0), soup_cli.__version__
 
 
 def test_no_top_level_heavy_imports():