Temporarily revert to v0.7.21 for cross-package development

Mark as non-breaking (0.7.x) so downstream packages (NamedDimsArrays,
GradedArrays) can Pkg.develop this branch without compat clashes.
Will bump to 0.8.0 before merging.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: mtfishman

Project.toml

@@ -1,6 +1,6 @@
 name = "TensorAlgebra"
 uuid = "68bd88dc-f39d-4e12-b2ca-f046b68fcc6a"
-version = "0.8.0"
+version = "0.7.21"
 authors = ["ITensor developers <support@itensor.org> and contributors"]
 
 [workspace]

docs/Project.toml

@@ -11,4 +11,4 @@ path = ".."
 Documenter = "1.8.1"
 ITensorFormatter = "0.2.27"
 Literate = "2.20.1"
-TensorAlgebra = "0.8"
+TensorAlgebra = "0.7"

examples/Project.toml

@@ -5,4 +5,4 @@ TensorAlgebra = "68bd88dc-f39d-4e12-b2ca-f046b68fcc6a"
 path = ".."
 
 [compat]
-TensorAlgebra = "0.8"
+TensorAlgebra = "0.7"

test/Project.toml

@@ -36,7 +36,7 @@ Random = "1.10"
 SafeTestsets = "0.1"
 StableRNGs = "1.0.2"
 Suppressor = "0.2"
-TensorAlgebra = "0.8"
+TensorAlgebra = "0.7"
 TensorOperations = "5.1.4"
 Test = "1.10"
 TestExtras = "0.3.1"