test(flavor): pin support table's element shape, not just outer Array kind

Copilot review on PR #723 flagged that TestSupportTable_IsArrayNotMap
only checked reflect.TypeOf(support).Kind() == reflect.Array -- a
regression to [flavorCount]map[Feature]bool would still satisfy that
check (still an Array at the top level) while reintroducing a
per-row map lookup. Assert the element type is itself an Array of
bool, not another map.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LJTrn4DizYTMdYj4tbswVJ

Author: claude

pkg/markdown/flavor/feature_test.go

@@ -89,8 +89,15 @@ func TestAllFeaturesComplete(t *testing.T) {
 // search beats a map for n < ~100" / small fixed-set guidance.
 func TestSupportTable_IsArrayNotMap(t *testing.T) {
 	typ := reflect.TypeOf(support)
-	assert.Equal(t, reflect.Array, typ.Kind(),
+	require.Equal(t, reflect.Array, typ.Kind(),
 		"support table should be a flat array, not a nested map")
+	// Pin the element type too: a regression to [flavorCount]map[Feature]bool
+	// would still satisfy the outer Array check above while reintroducing a
+	// per-call map lookup for every row.
+	require.Equal(t, reflect.Array, typ.Elem().Kind(),
+		"support table's rows should be arrays, not maps")
+	assert.Equal(t, reflect.Bool, typ.Elem().Elem().Kind(),
+		"support table should hold bool values directly, not through another indirection")
 }
 
 // TestSupports_OutOfRangeReturnsFalse pins Supports' documented