feat(fu2b): flag PROC_MISMATCH (case_number prefix vs proceeding_type) for chair

Dry-run surfaced 2 rows with בל"מ prefix but proceeding_type=ערר. Since the
migration strips the prefix, a wrong proceeding_type would silently lose the
בל"מ signal — must be chair-adjudicated, not auto-applied. Chair table now
flags 4 rows: 2 DUP_CHECK (8047-23) + 2 PROC_MISMATCH.

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

mcp-server/tests/test_fu2b_reconcile.py

@@ -48,3 +48,15 @@ def test_consistency_flag_when_bare_absent_from_citation():
     assert fu2b._consistency_flag("403-17", "ערר (...) 403/17 אהרון ברק") == "OK"
     assert fu2b._consistency_flag("403-17", "ערר (...) 1975/24 מישהו אחר") == "MISMATCH"
     assert fu2b._consistency_flag("403-17", "") == "NO_CITATION"
+
+
+def test_proc_mismatch_detects_prefix_vs_type_conflict():
+    # case_number prefix disagrees with proceeding_type → must flag (prefix is
+    # stripped by the migration, so a wrong proceeding_type loses the signal).
+    assert fu2b._proc_mismatch('בל"מ 1010-01-25', "ערר") is True
+    assert fu2b._proc_mismatch('בל"מ (...) 1028/20 חלוואני', "ערר") is True
+    # agreement → no flag
+    assert fu2b._proc_mismatch('ערר 1024/24 נילי', "ערר") is False
+    assert fu2b._proc_mismatch('בל"מ 1010-01-25', 'בל"מ') is False
+    # bare number with no prefix → nothing to contradict
+    assert fu2b._proc_mismatch("8047/23", 'בל"מ') is False