test: guard law and journal paths for relaxed reporter whitespace

Law (laws.json) and journal (journals.json) citations build their
regexes through the same _add_regexes chokepoint as case reporters,
so the whitespace relaxation applies to them too. Add spaced
"U. S. C." and "F. B. I. S." cases -- neither spaced form is a
registered variation, so they match only via the relaxation.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: grossir

tests/test_FindTest.py

@@ -890,6 +890,17 @@ def test_relaxed_reporter_whitespace(self):
              [case_citation(volume='799', page='797', reporter='N.Y.S.2d',
                             reporter_found='N. Y. S. 2d', short=True,
                             metadata={'antecedent_guess': 'Adarand'})]),
+            # Law citations (laws.json) and journal citations (journals.json)
+            # build their regexes through the same chokepoint, so the
+            # relaxation applies to them too. Spaced "U. S. C." / "F. B. I. S."
+            # are not registered variations, so these only match via it.
+            ('18 U. S. C. § 4241',
+             [law_citation('18 U. S. C. § 4241', reporter='U.S.C.',
+                           reporter_found='U. S. C.',
+                           groups={'title': '18', 'section': '4241'})]),
+            ('1 F. B. I. S. 1',
+             [journal_citation('1 F. B. I. S. 1', reporter='F.B.I.S.',
+                               reporter_found='F. B. I. S.')]),
         )
         # fmt: on
         self.run_test_pairs(test_pairs, "Relaxed reporter whitespace")