fix(occurrence): remove dead nil guard in countPattern; add empty-token test

countPattern is only called when r.Pattern != nil (all callers guard it),
so the nil check was dead code per the project's defensive-code rule
(branches must be driveable red/green). Remove it and add a test for
the empty-token path in countToken to reach 100% statement coverage.

Author: claude

internal/rules/occurrence/rule.go

@@ -238,11 +238,8 @@ func (r *Rule) countToken(text string, ti int) int {
 	return strings.Count(text, tok)
 }
 
-// countPattern counts regexp matches in text.
+// countPattern counts regexp matches in text. Caller must ensure r.Pattern != nil.
 func (r *Rule) countPattern(text string) int {
-	if r.Pattern == nil {
-		return 0
-	}
 	return len(r.Pattern.FindAllStringIndex(text, -1))
 }
 

internal/rules/occurrence/rule_test.go

@@ -388,6 +388,13 @@ func TestApplySettings_MinWrongType(t *testing.T) {
 	assert.Contains(t, err.Error(), "min")
 }
 
+func TestCheck_Paragraph_EmptyToken_NoDiagnostic(t *testing.T) {
+	r := &Rule{}
+	mustApply(t, r, map[string]any{"tokens": []any{""}, "max": 1, "count": "each"})
+	// empty token always returns count 0 → within any max
+	assert.Empty(t, r.Check(mustFile(t, "# T\n\nsome text.\n")))
+}
+
 // --- paragraph scope: pattern with count=each ---
 
 func TestCheck_Paragraph_PatternEach_ExceedsMax(t *testing.T) {