Revert "fix(isc): retry the DSL grammar when the artifact misparses a source"

This reverts commit 1d80448.

Author: ronaldtse

lib/interscript/isc/parser.rb

@@ -34,13 +34,6 @@ def parse_with_callbacks(source, filename: nil)
             parse_with_artifact(source)
           rescue ArtifactUnavailable
             parse_with_dsl(source)
-          rescue Parsanol::ParseFailed
-            # A stale or buggy artifact must not fail a source the DSL
-            # grammar accepts (the acadsin-zho-Hani-Latn-2002 incident:
-            # the shipped artifact rejected lowercase system codes the
-            # DSL handles). Re-parse through the Ruby grammar; the
-            # artifact recompile remains the real fix upstream.
-            parse_with_dsl(source)
           end
           Normalizer.normalize(tree)
         rescue Parsanol::ParseFailed => e

spec/interscript/isc/parser_spec.rb

@@ -80,19 +80,6 @@
       expect(artifact_tree).to eq(dsl_tree)
     end
 
-    it "retries the DSL grammar when the artifact misparses a corpus map" do
-      skip "parsanol lacks PARG (needs >= 1.3.61)" unless Interscript::Isc::Parser.respond_to?(:artifact)
-
-      # Regression guard: a stale/buggy artifact must not fail a source the
-      # DSL grammar handles (acadsin-zho-Hani-Latn-2002.isc did exactly
-      # this — artifact rejected lowercase system codes, DSL accepted).
-      allow(described_class).to receive(:parse_with_artifact)
-        .and_raise(Parsanol::ParseFailed.new("artifact mismatch"))
-      tree = described_class.parse(src)
-      doc = Interscript::Isc::DocumentBuilder.build(tree, filename: "test.isc")
-      expect(doc[:systemCode]).to eq("s")
-    end
-
     it "falls back to the DSL grammar when the artifact cannot load" do
       skip "parsanol lacks PARG (needs >= 1.3.61)" unless Interscript::Isc::Parser.respond_to?(:artifact)