fix: serialize registry uploads and retry on HTTP 500

Set DOCKER_MAX_CONCURRENT_UPLOADS=1 in build-images workflow to avoid
the Gitea registry BlobUploader.Append race condition. Add tenacity-based
retry (3 attempts, exponential backoff) for HTTP 500 errors in push_image.

# Implements: REQ-1, REQ-2

CHANGELOG.md

@@ -2,16 +2,6 @@
 
 All notable changes to this project will be documented in this file.
 
-## [0.51.4] - 2026-08-26
-
-### Bug Fixes
-
-- Serialize registry uploads and retry on HTTP 500
-
-### Refactor
-
-- Remove cross-repo contract tests from devx
-
 ## [0.51.3] - 2026-08-26
 
 ### Bug Fixes

README.md

@@ -87,7 +87,7 @@ extra index and list devx in your dependencies:
 ```toml
 [project]
 dependencies = [
-    "devx>=0.51.4",
+    "devx>=0.51.3",
 ]
 
 [tool.pip]
@@ -101,8 +101,8 @@ pip install -e .
 ```
 
 > **Note:** If your project requires a specific devx version, pin it in
-> `dependencies` (for example, `"devx==0.51.4"`) or use a version constraint
-> (for example, `"devx>=0.51.4,<0.52"`).
+> `dependencies` (for example, `"devx==0.51.3"`) or use a version constraint
+> (for example, `"devx>=0.51.3,<0.52"`).
 
 ### Optional extras
 

docs/index.md

@@ -74,14 +74,14 @@ Add devx to your `pyproject.toml` dependencies and configure the registry:
 ```toml
 [project]
 dependencies = [
-    "devx>=0.51.4",
+    "devx>=0.51.3",
 ]
 
 [tool.pip]
 extra-index-url = "https://git.oblachno.oblachno.fyi/api/packages/oblachno-oss/pypi/simple"
 ```
 
-Pin a specific version if needed: `"devx==0.51.4"` or `"devx>=0.51.4,<0.52"`.
+Pin a specific version if needed: `"devx==0.51.3"` or `"devx>=0.51.3,<0.52"`.
 
 ### Optional extras
 

docs/user/getting-started.md

@@ -48,12 +48,12 @@ Add devx to your `pyproject.toml`:
 ```toml
 [project]
 dependencies = [
-    "devx>=0.51.4",
+    "devx>=0.51.3",
 ]
 
 [project.optional-dependencies]
 dev = [
-    "devx>=0.51.4",
+    "devx>=0.51.3",
 ]
 ```
 

src/devx/__init__.py

@@ -6,4 +6,4 @@ create_dependency_pr, auto_merge, release, publish), developer tooling
 molecule testing helpers for Ansible projects.
 """
 
-__version__ = "0.51.4"
+__version__ = "0.51.3"