fix(python): preserve marshal names and packaged bytecode

Use one marshal surrogatepass decoder for PYZ directories and Python bytecode.
Validate ordinary UTF-8 spans with the native fatal decoder, preserving BOMs,
lone surrogates, raw bytes and marshal reference slots.

Distinguish legacy full-pyc CArchive modules from modern marshal-only modules
before reconstructing headers. Share typed source/codec failures between stream
output and completion while retaining native-read drain and cleanup ownership.

Validated focused producer, reader, lifecycle, CLI and MCP regressions, plus
public inventory/extraction of CPython 3.14-generated marshal tables and code.
No packaged application was executed. Document original versus derived bytes.

Fixes #6800
Fixes #6789

src/python/PythonPycParser.test.ts

@@ -321,11 +321,11 @@ it("charges long digits to the string budget and keeps large previews bounded",
 
 it("decodes marshal strings with CPython surrogatepass rules", () => {
   const report = parse(
-    withConsts([marshalUnicode(Buffer.from([0x73, 0xed, 0xa0, 0x80]))]),
+    withConsts([marshalUnicode(Buffer.from("efbbbf73eda080efbbbf", "hex"))]),
   );
   expect(root(report).consts[0]).toMatchObject({
     kind: "str",
-    value: "s\ud800",
+    value: "\ufeffs\ud800\ufeff",
   });
   expect(() =>
     parse(withConsts([marshalUnicode(Buffer.from([0xf0, 0x90, 0x80]))])),