TESTING ONLY: deliberately break mdtest assertions to verify GitHub annotations

This commit intentionally introduces wrong `revealed:` expectations
to test that `::error` GitHub annotations render correctly on the PR diff.

This commit should be reverted before merging.

https://claude.ai/code/session_01Pz2xREd4bteUUqxyg3QzpM

Author: claude

crates/ty_python_semantic/resources/mdtest/attributes.md

@@ -25,8 +25,8 @@ class C:
 
 c_instance = C(1)
 
-reveal_type(c_instance.inferred_from_value)  # revealed: Unknown | Literal[1, "a"]
-reveal_type(c_instance.inferred_from_other_attribute)  # revealed: Unknown | Literal[1, "a"]
+reveal_type(c_instance.inferred_from_value)  # revealed: int
+reveal_type(c_instance.inferred_from_other_attribute)  # revealed: str
 
 # There is no special handling of attributes that are (directly) assigned to a declared parameter,
 # which means we union with `Unknown` here, since the attribute itself is not declared. This is