Remove Pyre mode headers in fbcode/core_stats

Summary:
Remove standalone `# pyre-strict` and `# pyre-unsafe` mode headers from Python files under `fbcode/core_stats`.

Pyrefly type-checks all files in one consistent mode, so these legacy per-file mode headers no longer have an effect. Other Pyre directives and generated files are left unchanged.

Pyrefly is now the default type checker across FBCode so this diff introduces no functional changes.

drop-conflicts
#pyreupgrade

Reviewed By: maggiemoss

Differential Revision: D117460331

fbshipit-source-id: 0125e4f70337911108decefff2e8d51622c7084d

Author: generatedunixname89002005307016

balance/__init__.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 from __future__ import annotations
 

balance/adjustment.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 from __future__ import annotations
 

balance/balance_frame.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 """BalanceFrame: workflow orchestrator for survey/observational data reweighting.
 

balance/balancedf_class.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 from __future__ import annotations
 

balance/cli.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 from __future__ import annotations
 

balance/csv_utils.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 from __future__ import annotations
 

balance/datasets/__init__.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 from balance.datasets.loading_data import load_cbps_data, load_data, load_sim_data
 

balance/datasets/loading_data.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 from __future__ import annotations
 

balance/interop/__init__.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 """balance.interop — adapters between balance and adjacent libraries.
 

balance/interop/_common.py

@@ -3,7 +3,6 @@
 # This source code is licensed under the MIT license found in the
 # LICENSE file in the root directory of this source tree.
 
-# pyre-strict
 
 """Shared helpers for ``balance.interop.*`` adapters.