diff --git a/.release-please-manifest.json b/.release-please-manifest.json
index e18ee07..37fcefa 100644
--- a/.release-please-manifest.json
+++ b/.release-please-manifest.json
@@ -1,3 +1,3 @@
 {
-  ".": "0.0.0"
+  ".": "1.0.0"
 }
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..0f95876
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,18 @@
+# Changelog
+
+## 1.0.0 (2026-07-13)
+
+
+### Features
+
+* establish cas platform v0.1 foundation ([2d6ab06](https://github.com/Coding-Autopilot-System/cas-platform/commit/2d6ab06395e64fb6fdd77fed6b2bdcd5b34b73aa))
+* integrate reference product workload contract ([1311352](https://github.com/Coding-Autopilot-System/cas-platform/commit/131135297a6c6fb4544becaa9f1d229615960d8d))
+
+
+### Bug Fixes
+
+* **ci:** repin release-please reusable workflow to reachable SHA ([#16](https://github.com/Coding-Autopilot-System/cas-platform/issues/16)) ([0739218](https://github.com/Coding-Autopilot-System/cas-platform/commit/07392181defcb4d02481f1cd94ce719781624592))
+* **ci:** wire release-please PAT into reusable workflow caller ([#21](https://github.com/Coding-Autopilot-System/cas-platform/issues/21)) ([d091e78](https://github.com/Coding-Autopilot-System/cas-platform/commit/d091e78e4c70ee663b7d209eeeb30ad93e519186))
+* enable use-recent-api-versions bicep lint rule ([#11](https://github.com/Coding-Autopilot-System/cas-platform/issues/11)) ([b5be815](https://github.com/Coding-Autopilot-System/cas-platform/commit/b5be815950f6899dc3094ac3a9b5299930f86ce1))
+* Resolve PSScriptAnalyzer warnings ([#6](https://github.com/Coding-Autopilot-System/cas-platform/issues/6)) ([aa38662](https://github.com/Coding-Autopilot-System/cas-platform/commit/aa38662abd977cd3e8afa1e9032d29dbeeab4d7f))
+* secure observability public network access by default ([#7](https://github.com/Coding-Autopilot-System/cas-platform/issues/7)) ([202d078](https://github.com/Coding-Autopilot-System/cas-platform/commit/202d078800664db479ed1ee3ba57e7715ba3fd21))