Implement op_verify and wire ZLexer into sread for Zork 1

op_verify now performs actual checksum validation against the header
instead of raising NotImplemented. ZLexer is injected into ZCpu and
sread tokenizes input into the parse buffer per the V3 spec.

src/mudlib/zmachine/zcpu.py

@@ -43,7 +43,7 @@ class ZCpuRestart(ZCpuError):
 
 class ZCpu:
     def __init__(
-        self, zmem, zopdecoder, zstack, zobjects, zstring, zstreammanager, zui
+        self, zmem, zopdecoder, zstack, zobjects, zstring, zstreammanager, zui, zlexer
     ):
         self._memory = zmem
         self._opdecoder = zopdecoder
@@ -52,6 +52,7 @@ class ZCpu:
         self._string = zstring
         self._streammanager = zstreammanager
         self._ui = zui
+        self._lexer = zlexer
 
     def _get_handler(self, opcode_class, opcode_number):
         try:
@@ -556,8 +557,10 @@ class ZCpu:
         pass
 
     def op_verify(self, *args):
-        """TODO: Write docstring here."""
-        raise ZCpuNotImplemented
+        """Verify story file checksum. Branch if checksum matches."""
+        expected_checksum = self._memory.read_word(0x1C)
+        actual_checksum = self._memory.generate_checksum()
+        self._branch(expected_checksum == actual_checksum)
 
     def op_piracy(self, *args):
         """TODO: Write docstring here."""
@@ -619,9 +622,22 @@ class ZCpu:
         self._memory[text_buffer_addr + 1 + len(text)] = 0
 
         # Tokenize if parse buffer provided
-        # Note: ZLexer not yet wired up - tokenization will be added when needed
         if parse_buffer_addr != 0:
-            pass  # TODO: add tokenization when ZLexer is integrated
+            max_words = self._memory[parse_buffer_addr]
+            tokens = self._lexer.parse_input(text)
+            num_words = min(len(tokens), max_words)
+            self._memory[parse_buffer_addr + 1] = num_words
+            offset = 0
+            for i in range(num_words):
+                word_str, dict_addr = tokens[i]
+                # Find word position in text
+                pos = text.find(word_str, offset)
+                word_len = len(word_str)
+                base = parse_buffer_addr + 2 + (i * 4)
+                self._memory.write_word(base, dict_addr)
+                self._memory[base + 2] = word_len
+                self._memory[base + 3] = pos + 1  # 1-indexed from start of text buffer
+                offset = pos + word_len
 
     def op_sread_v4(self, *args):
         """TODO: Write docstring here."""

src/mudlib/zmachine/zmachine.py

@@ -7,6 +7,7 @@
 
 from . import zlogging
 from .zcpu import ZCpu
+from .zlexer import ZLexer
 from .zmemory import ZMemory
 from .zobjectparser import ZObjectParser
 from .zopdecoder import ZOpDecoder
@@ -33,6 +34,7 @@ class ZMachine:
         self._opdecoder.program_counter = self._mem.read_word(0x06)
         self._ui = ui
         self._stream_manager = ZStreamManager(self._mem, self._ui)
+        self._lexer = ZLexer(self._mem)
         self._cpu = ZCpu(
             self._mem,
             self._opdecoder,
@@ -41,6 +43,7 @@ class ZMachine:
             self._stringfactory,
             self._stream_manager,
             self._ui,
+            self._lexer,
         )
 
     # --------- Public APIs -----------

tests/test_zmachine_opcodes.py

@@ -107,6 +107,7 @@ class ZMachineOpcodeTests(TestCase):
             Mock(),  # string
             Mock(),  # stream manager
             self.ui,
+            Mock(),  # lexer
         )
 
     def test_op_nop(self):
@@ -356,6 +357,7 @@ class ZMachineObjectOpcodeTests(TestCase):
             self.string,
             Mock(),  # stream manager
             self.ui,
+            Mock(),  # lexer
         )
 
     def test_op_get_sibling_with_sibling(self):
@@ -536,6 +538,7 @@ class ZMachineComplexOpcodeTests(TestCase):
             Mock(),  # string
             Mock(),  # stream manager
             self.ui,
+            Mock(),  # lexer
         )
 
     def test_op_sread_v3_basic_input(self):