Restore the README hero banner

CONTRIBUTING.md

@@ -117,4 +117,4 @@ Provider bootstrap, Runtime images and Harness adapters must agree on these name
 
 ## Branding
 
-Use OpenAgentCore for public project branding. The canonical mark is `docs/assets/openagentcore-logo.svg`; Web uses its outline with cropped transparent margins, theme-aware favicon colors and dark-surface inversion. The README wordmark is `docs/assets/openagentcore-wordmark-light.svg` with a dark variant, and `docs/assets/og-image.png` is the social preview. The architecture diagram that README and the website show, `docs/assets/architecture.svg` and `architecture-dark.svg`, is generated by `scripts/generate-architecture-diagram.py`; change the script and run it again. The `example/parsar/` example keeps its own name, logo and favicon.
+Use OpenAgentCore for public project branding. The canonical mark is `docs/assets/openagentcore-logo.svg`; Web uses its outline with cropped transparent margins, theme-aware favicon colors and dark-surface inversion. The README banner is `docs/assets/openagentcore-banner.webp`, and `docs/assets/og-image.png` is the social preview. The architecture diagram that README and the website show, `docs/assets/architecture.svg` and `architecture-dark.svg`, is generated by `scripts/generate-architecture-diagram.py`; change the script and run it again. The `example/parsar/` example keeps its own name, logo and favicon.

README.md

@@ -1,9 +1,6 @@
 <div align="center">
 
-<picture>
-  <source media="(prefers-color-scheme: dark)" srcset="docs/assets/openagentcore-wordmark-dark.svg">
-  <img alt="OpenAgentCore" src="docs/assets/openagentcore-wordmark-light.svg" width="440">
-</picture>
+![OpenAgentCore — One core. Many agents.](docs/assets/openagentcore-banner.webp)
 
 The OpenAI Agents API, open source and self-hosted. Run Codex, Claude Code or MiniMax Code on your own machines with your own models, through the official OpenAI SDK.
 
@@ -15,7 +12,7 @@ The OpenAI Agents API, open source and self-hosted. Run Codex, Claude Code or Mi
 
 </div>
 
-<p align="center"><img alt="Deployment overview" src="docs/assets/console-overview-en.webp" width="75%"></p>
+![Deployment overview](docs/assets/console-overview-en.webp)
 
 - **Same API as OpenAI.** Set `OPENAI_BASE_URL` and the [official OpenAI SDK](https://developers.openai.com/api/docs/libraries), or plain HTTP, works unchanged.
 - **Your agent, your model.** Each Session runs Codex, Claude Code or MiniMax Code natively, as it runs on your machine, with the model provider you configure. See [Harness capabilities](https://openagentcore.dev/contracts/agents-api/harness-capabilities).

README.zh-CN.md

@@ -1,9 +1,6 @@
 <div align="center">
 
-<picture>
-  <source media="(prefers-color-scheme: dark)" srcset="docs/assets/openagentcore-wordmark-dark.svg">
-  <img alt="OpenAgentCore" src="docs/assets/openagentcore-wordmark-light.svg" width="440">
-</picture>
+![OpenAgentCore — One core. Many agents.](docs/assets/openagentcore-banner.webp)
 
 开源、可自部署的 OpenAI Agents API。用官方 OpenAI SDK，在你自己的机器上用你自己的模型运行 Codex、Claude Code 或 MiniMax Code。
 
@@ -15,7 +12,7 @@
 
 </div>
 
-<p align="center"><img alt="部署概览" src="docs/assets/console-overview-zh.webp" width="75%"></p>
+![部署概览](docs/assets/console-overview-zh.webp)
 
 - **与 OpenAI 相同的 API。** 设置 `OPENAI_BASE_URL` 后，[官方 OpenAI SDK](https://developers.openai.com/api/docs/libraries)或直接的 HTTP 调用无需改动即可使用。
 - **你的 Agent，你的模型。** 每个 Session 原生运行 Codex、Claude Code 或 MiniMax Code，使用你配置的模型提供商，与在本机运行一致。详见 [Harness 能力](https://openagentcore.dev/zh/contracts/agents-api/harness-capabilities)。

scripts/core-distribution-manifest.py

@@ -52,8 +52,7 @@
 )
 # Files the bundled docs show, copied as they are, so they work offline.
 BUNDLED_FILES = (
-    "docs/assets/openagentcore-wordmark-light.svg",
-    "docs/assets/openagentcore-wordmark-dark.svg",
+    "docs/assets/openagentcore-banner.webp",
     "docs/assets/architecture.svg",
     "docs/assets/architecture-dark.svg",
     "docs/assets/console-overview-en.webp",