Release 0.23.0

Summary:
Cut the 0.23.0 release of `balance` and `graviton`.

Bumps `balance.__version__` from `0.22.0.x` to `0.23.0` and `graviton.__version__` from `0.22.0` to `0.23.0`, finalizes the balance `CHANGELOG.md` header from `0.23.0 (unreleased)` to `0.23.0 (2026-08-04)`, adds neuralsorcerer to the 0.23.0 contributors, and adds the corresponding `0.23.0` entry to the graviton `CHANGELOG.md`.

The graviton entry follows the richer inherited-sections format used for the 0.20.0 and 0.21.0 feature releases rather than the News-only format used for 0.22.0, since 0.23.0 adds a new estimator family. It records the `predicted_outcome_columns` to `outcomes_hat_columns` rename under inherited breaking changes — the coupling that `graviton/CLAUDE.md` calls out as invisible to balance's own test suite — plus the outcome-modelling, AIPW, bootstrap-CI, and `weighted_r2` additions.

Stacked on the two changelog diffs that precede it: the conventions and past-release cleanup, then the 0.23.0 entry rewrite.

Differential Revision: D114720604

fbshipit-source-id: af90abf77b6be62a2d566c32d39350785d170db4

Author: talgalili

CHANGELOG.md

@@ -1,4 +1,4 @@
-# 0.23.0 (unreleased)
+# 0.23.0 (2026-08-04)
 
 ## Highlights
 
@@ -149,7 +149,7 @@ for the design rationale.
 
 ## Contributors
 
-@talgalili
+@talgalili, @neuralsorcerer
 
 # 0.22.0 (2026-07-15)
 

balance/__init__.py

@@ -24,7 +24,7 @@
 
 # pyrefly: ignore [unknown-name]
 global __version__
-__version__ = "0.22.0.x"
+__version__ = "0.23.0"
 
 WELCOME_MESSAGE = f"""
 balance (Version {__version__}) loaded: