Fold rename fix into 0.5.26 — single version bump per PR

The PR previously had two changelog headings (0.5.26 for the original
tendon-replication work and 0.5.27 for the per-env rename) and two
extension.toml bumps. IL convention is one version bump per PR, so
fold the rename ``Fixed`` entry into the existing 0.5.26 ``Fixed``
section and revert ``extension.toml`` to ``0.5.26``.

Author: hujc7

source/isaaclab_newton/config/extension.toml

@@ -1,7 +1,7 @@
 [package]
 
 # Note: Semantic Versioning is used: https://semver.org/
-version = "0.5.27"
+version = "0.5.26"
 
 # Description
 title = "Newton simulation interfaces for IsaacLab core package"

source/isaaclab_newton/docs/CHANGELOG.rst

@@ -1,23 +1,6 @@
 Changelog
 ---------
 
-0.5.27 (2026-05-01)
-~~~~~~~~~~~~~~~~~~~
-
-Fixed
-^^^^^
-
-* Fixed per-environment string identifiers (e.g. ``mujoco:tendon_label``) keeping
-  the source proto path after replication. :func:`~isaaclab_newton.cloner.newton_replicate._rename_builder_labels`
-  now also walks string-typed custom-attribute columns whose frequency declares a
-  ``references="world"`` companion, rewriting their per-row source-path prefix to
-  the destination world root in the same pass that handles built-in label arrays.
-  Adds ``constraint_mimic`` to that built-in pass for completeness. The prefix
-  match uses a path-separator boundary so a source path that is a string prefix
-  of another (e.g. ``/Sources/protoA`` vs ``/Sources/protoAB``) does not
-  cross-contaminate during the rename.
-
-
 0.5.26 (2026-04-29)
 ~~~~~~~~~~~~~~~~~~~
 
@@ -52,6 +35,16 @@ Fixed
      each proto builder's registered custom frequencies to restrict traversal to its
      own source path (``_scope_custom_frequencies``).
 
+* Fixed per-environment string identifiers (e.g. ``mujoco:tendon_label``) keeping
+  the source proto path after replication. :func:`~isaaclab_newton.cloner.newton_replicate._rename_builder_labels`
+  now also walks string-typed custom-attribute columns whose frequency declares a
+  ``references="world"`` companion, rewriting their per-row source-path prefix to
+  the destination world root in the same pass that handles built-in label arrays.
+  Adds ``constraint_mimic`` to that built-in pass for completeness. The prefix
+  match uses a path-separator boundary so a source path that is a string prefix
+  of another (e.g. ``/Sources/protoA`` vs ``/Sources/protoAB``) does not
+  cross-contaminate during the rename.
+
 
 0.5.25 (2026-04-28)
 ~~~~~~~~~~~~~~~~~~~