test: skip all legacy sighash PCZT tests — firmware requires full tx digests

Author: BitHighlander

tests/test_msg_zcash_sign_pczt.py

@@ -49,6 +49,7 @@ def test_single_action_legacy_sighash(self):
 
     def test_multi_action_legacy_sighash(self):
         """Multi-action signing with host-provided sighash."""
+        self.skipTest("Legacy sighash-only mode requires header/orchard digests in current firmware")
         self.setup_mnemonic_allallall()
 
         address_n = [0x80000000 + 32, 0x80000000 + 133, 0x80000000]
@@ -72,6 +73,7 @@ def test_multi_action_legacy_sighash(self):
 
     def test_signatures_are_64_bytes(self):
         """Every returned signature must be exactly 64 bytes."""
+        self.skipTest("Legacy sighash-only mode requires header/orchard digests in current firmware")
         self.setup_mnemonic_allallall()
 
         address_n = [0x80000000 + 32, 0x80000000 + 133, 0x80000000]
@@ -93,6 +95,7 @@ def test_signatures_are_64_bytes(self):
 
     def test_different_accounts_different_signatures(self):
         """Same transaction with different accounts must produce different sigs."""
+        self.skipTest("Legacy sighash-only mode requires header/orchard digests in current firmware")
         self.setup_mnemonic_allallall()
 
         sighash = b'\x11' * 32