Revert "refactor: clean up legacy code, rename hopper to entity_extractor, and add third-party notices"

This reverts commit 54fcef9887.

Please do not submit unrelated docs and codes in the same commit. I am reverting this commit so that the related files can be submitted in better-organized future commits.

artemis/agents/planner/planner.py

@@ -23,7 +23,7 @@ from pydantic import BaseModel, Field
 
 from artemis.context import ArtemisContext
 from artemis.controllers.unified_controller import UnifiedMobileController
-from artemis.data_engine.trace import TraceSpan, trace
+from artemis.data_engine.trace import CURRENT_TRACE_ID, TraceSpan, trace
 from artemis.graph.state import State
 from artemis.graph.visibility import strict_state
 from artemis.services.llm import (
@@ -108,7 +108,26 @@ def build_planner_system_blocks(prompts_data: dict, mode: str, include_checks: b
     return blocks
 
 
+class _CyFunctionDetectorMeta(type):
+    def __instancecheck__(self, instance):
+        name = type(instance).__name__
+        return (
+            name
+            in (
+                "cyfunction",
+                "cython_function_or_method",
+                "builtin_function_or_method",
+            )
+            or "cyfunction" in name.lower()
+        )
+
+
+class CyFunctionDetector(metaclass=_CyFunctionDetectorMeta):
+    pass
+
+
 class ValidationResult(BaseModel):
+    model_config = {"ignored_types": (CyFunctionDetector,)}
     is_approved: bool = Field(
         description=(
             "True if the new plan still serves the initial goal and is coherent."