Prepare before 1.14.0-alpha20250911 release (#37590)

Author: hc-github-team-tf-core

CHANGELOG.md

@@ -1,4 +1,9 @@
-## 1.14.0 (Unreleased)
+## 1.14.0-alpha20250911 (September 11, 2025)
+
+
+NEW FEATURES:
+
+* A new GenerateResourceConfiguration RPC allows providers to create more precise configuration values during import. ([#37515](https://github.com/hashicorp/terraform/issues/37515))
 
 
 ENHANCEMENTS:
@@ -10,6 +15,8 @@ ENHANCEMENTS:
 
 BUG FIXES:
 
+* Retrieve all workspace variables while doing a `terraform import`, include variables inherited from variable sets but not overwritten by the workspace. ([#37241](https://github.com/hashicorp/terraform/issues/37241))
+
 * Fix OSS backend proxy support by adding a proxy layer for OSS backend operations. Resolves hashicorp/terraform#36897. ([#36897](https://github.com/hashicorp/terraform/issues/36897))
 
 
@@ -25,6 +32,10 @@ EXPERIMENTS:
 Experiments are only enabled in alpha releases of Terraform CLI. The following features are not yet available in stable releases.
 
 - The experimental "deferred actions" feature, enabled by passing the `-allow-deferral` option to `terraform plan`, permits `count` and `for_each` arguments in `module`, `resource`, and `data` blocks to have unknown values and allows providers to react more flexibly to unknown values.
+- `terraform test cleanup`: The experimental `test cleanup` command. In experimental builds of Terraform, a manifest file and state files for each failed cleanup operation during test operations are saved within the `.terraform` local directory. The `test cleanup` command will attempt to clean up the local state files left behind automatically, without requiring manual intervention.
+- `terraform test`: `backend` blocks and `skip_cleanup` attributes:
+  - Test authors can now specify `backend` blocks within `run` blocks in Terraform Test files. Run blocks with `backend` blocks will load state from the specified backend instead of starting from empty state on every execution. This allows test authors to keep long-running test infrastructure alive between test operations, saving time during regular test operations.
+  - Test authors can now specify `skip_cleanup` attributes within test files and within run blocks. The `skip_cleanup` attribute tells `terraform test` not to clean up state files produced by run blocks with this attribute set to true. The state files for affected run blocks will be written to disk within the `.terraform` directory, where they can then be cleaned up manually using the also experimental `terraform test cleanup` command.
 
 ## Previous Releases
 

version/VERSION

@@ -1 +1 @@
-1.14.0-dev
+1.14.0-alpha20250911