Update enterprise-v2.8.md and release-downloads.md for v2.8.13 (#586)

Author: kuiliu88

docs/enterprise-v2.8.md

@@ -32,6 +32,28 @@ Key highlights of this release:
 ## Releases
 We recommend using stable releases for production deployment. Engineering builds are available for testing and evaluation purposes.
 
+### 2.8.13 (Public GA) {#2_8_12}
+Released on 02-13-2026. Installation options:
+* For Linux or Mac users: `curl https://install.timeplus.com/2.8 | sh` [Downloads](/release-downloads#2_8_13)
+* For Kubernetes users: helm install timeplus/timeplus-enterprise --version v7.0.34 ..
+* For Docker users (not recommended for production): `docker run -p 8000:8000 docker.timeplus.com/timeplus/timeplus-enterprise:2.8.13`
+
+Component versions:
+* timeplusd 2.8.37
+* timeplus_web 2.8.18
+* timeplus_appserver 2.8.13
+* timeplus_connector 2.8.1
+* timeplus cli 2.8.0
+  
+#### Changelog {#changelog_2_8_11}
+Compared to the [2.8.11](#2_8_11) release:
+* timeplusd 2.8.35 -> 2.8.37
+  * Bugfixes  
+    *   Fixed mutable stream stability issue.
+    *   Fixed secondary index build/cleanup issues.
+    *   Fixed mutable stream race conditions and alignment issue.
+    *   Improved part consistency. 
+
 ### 2.8.11 (Public GA) {#2_8_11}
 Released on 01-29-2026. Installation options:
 * For Linux or Mac users: `curl https://install.timeplus.com/2.8 | sh` [Downloads](/release-downloads#2_8_11)

docs/release-downloads.md

@@ -28,6 +28,13 @@ Released on 09-25-2025 ([Change logs](/enterprise-v3.0#3_0_1-preview_2)).
 
 ## 2.8 {#2_8}
 
+### v2.8.13 {#2_8_13}
+Released on 02-13-2026 ([Change logs](/enterprise-v2.8#2_8_13)).
+
+* Bare metal installation: [Linux x86_64](https://d.timeplus.com/timeplus-enterprise-v2.8.13-linux-amd64.tar.gz) | [Linux ARM64](https://d.timeplus.com/timeplus-enterprise-v2.8.13-linux-arm64.tar.gz) | [macOS x86_64](https://d.timeplus.com/timeplus-enterprise-v2.8.13-darwin-amd64.tar.gz) | [macOS ARM64](https://d.timeplus.com/timeplus-enterprise-v2.8.13-darwin-arm64.tar.gz)
+* All-in-one Docker image (not recommended for production): `docker run -p 8000:8000 docker.timeplus.com/timeplus/timeplus-enterprise:2.8.13`
+
+
 ### v2.8.10 {#2_8_10}
 Released on 01-18-2026 ([Change logs](/enterprise-v2.8#2_8_10)).