backport(smoke): update AbiDecodeFailed shape and drop stale burnBlocked ABI fragment

script/smoke/chain.py

@@ -331,8 +331,8 @@ def _revert_bytes(exc: ContractLogicError) -> bytes | None:
     def expect_abi_decode_failed(self, desc: str, fn, frm: ChecksumAddress) -> None:
         """Simulate `fn` via eth_call; assert Rust precompile AbiDecodeFailed revert shape.
 
-        Dispatch decode failures encode as `function_selector || utf8_error`, not a typed
-        custom error such as InvalidVariant().
+        Dispatch decode failures encode as a bare `function_selector` (no message; the error
+        string was dropped), not a typed custom error such as InvalidVariant().
         """
         fn_selector = bytes(HexBytes(fn.selector))
         try:
@@ -361,7 +361,7 @@ def _assert_abi_decode_revert(
         if raw is None:
             self._diagnose(f"expected ABI decode failure: {desc}", repro_fn, repro_overrides, repro_call)
             die(f"expected ABI decode failure for {desc} but revert had no data")
-        if len(raw) <= 4:
+        if len(raw) < 4:
             self._diagnose(f"expected ABI decode failure: {desc}", repro_fn, repro_overrides, repro_call)
             die(f"expected ABI decode failure for {desc} but revert was only {len(raw)} byte(s): 0x{raw.hex()}")
         if raw[:4] != fn_selector:
@@ -382,7 +382,7 @@ def expect_raw_abi_decode_failed(
         value: int = 0,
         frm: ChecksumAddress | None = None,
     ) -> None:
-        """Assert hand-built calldata reverts with AbiDecodeFailed (selector || utf8)."""
+        """Assert hand-built calldata reverts with AbiDecodeFailed (bare selector, no message)."""
         if len(data) < 4:
             die(f"expected ABI decode failure for {desc} but calldata is shorter than 4 bytes")
         fn_selector = data[:4]

script/smoke/journeys/stablecoin_lifecycle.py

@@ -8,27 +8,9 @@
 from __future__ import annotations
 
 from .. import config
-from ..abis import STABLECOIN_ABI
 from ..chain import Chain, log, step
 from ..codec import StablecoinCreateParams, init_call
 
-# `burnBlocked` is a deprecated precompile selector that base-std #186 removed from the IB20
-# interface, so it is absent from STABLECOIN_ABI. The selector still dispatches on the precompile
-# (retained for back-compat), so bind it via an explicit fragment to keep exercising the legacy
-# burn-based freeze-and-seize path. The transfer-based seize surface is covered by the `seize` journey.
-_BURN_BLOCKED_FRAGMENT = {
-    "type": "function",
-    "name": "burnBlocked",
-    "stateMutability": "nonpayable",
-    "inputs": [{"name": "from", "type": "address"}, {"name": "amount", "type": "uint256"}],
-    "outputs": [],
-}
-
-
-def _burn_blocked_at(c: Chain, tok):
-    """A token binding including the deprecated `burnBlocked` selector (absent from STABLECOIN_ABI)."""
-    return c.w3.eth.contract(address=tok.address, abi=[*STABLECOIN_ABI, _BURN_BLOCKED_FRAGMENT])
-
 
 def _setup(c: Chain):
     salt = c.cfg.salt_for("stablecoin")
@@ -73,7 +55,7 @@ def _journey(c: Chain, tok) -> None:
     c.assert_eq(c.policy.functions.isAuthorized(pid, c.ALICE).call(), False, "alice blocked")
 
     step(5, "seize: burnBlocked(alice, 400); Transfer then BurnedBlocked")
-    receipt = c.send(_burn_blocked_at(c, tok).functions.burnBlocked(c.ALICE, config.amt(400, 6)), c.deployer)
+    receipt = c.send(tok.functions.burnBlocked(c.ALICE, config.amt(400, 6)), c.deployer)
     c.assert_eq(tok.functions.balanceOf(c.ALICE).call(), config.amt(600, 6), "alice balance after seize")
     c.assert_eq(tok.functions.totalSupply().call(), config.amt(1100, 6), "total supply after seize")
     c.assert_log_order(
@@ -86,7 +68,7 @@ def _journey(c: Chain, tok) -> None:
 
 def _edges(c: Chain, tok) -> None:
     step(6, "seize an unblocked account -> AccountNotBlocked")
-    c.expect_revert("AccountNotBlocked", _burn_blocked_at(c, tok).functions.burnBlocked(c.BOB, 1), c.DEPLOYER)
+    c.expect_revert("AccountNotBlocked", tok.functions.burnBlocked(c.BOB, 1), c.DEPLOYER)
 
     step(7, "role gate: user2 mint -> AccessControlUnauthorizedAccount")
     c.expect_revert("AccessControlUnauthorizedAccount", tok.functions.mint(c.ALICE, 1), c.USER2)