docs: new README hero GIF (smooth subagent pop, 3MB) + annotated dashboard tour

Replaces the 29MB subagent-demo.gif reference with a recaptured 6s loop:
three haiku Explore agents pop as floating windows (25fps through the pop,
bayer dither, 1080px) on the new clean header. Adds the annotated dashboard
tour screenshot below the feature bullets in both READMEs. Old GIF file kept
on disk so external hotlinks stay alive; new files use dated names so caches
can never serve a stale render.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: claude

README.md

@@ -23,7 +23,7 @@
 </p>
 
 <p align="center">
-  <img src="docs/images/subagent-demo.gif" alt="Codeman — parallel subagent visualization" width="900">
+  <img src="docs/images/subagent-demo-20260724.gif" alt="Codeman — parallel subagent visualization" width="900">
 </p>
 
 **Codeman** is a self-hosted mission control for AI coding agents. It spawns Claude Code, OpenCode, Codex, or Gemini CLI inside persistent tmux sessions, streams the real terminal to any browser, and keeps agents productive after you walk away: it re-prompts on idle, resumes when a usage limit resets, runs scheduled jobs, and shows every background agent working in real time.
@@ -35,6 +35,10 @@
 - **Nothing gets lost** - tmux persistence across restarts and network drops, exactly-once input delivery, full-scrollback replay
 - **Self-hosted and boring on purpose** - loopback-only by default, MIT licensed, no telemetry, runs entirely on your machine
 
+<p align="center">
+  <img src="docs/images/codeman-tour-20260724.png" alt="Codeman dashboard tour: session tabs per case, one-click Run for new agents, live plan usage in the header" width="900">
+</p>
+
 ---
 
 ## Quick Start - Installation

README.zh-CN.md

@@ -21,7 +21,11 @@
 </p>
 
 <p align="center">
-  <img src="docs/images/subagent-demo.gif" alt="Codeman — 并行子智能体可视化" width="900">
+  <img src="docs/images/subagent-demo-20260724.gif" alt="Codeman — 并行子智能体可视化" width="900">
+</p>
+
+<p align="center">
+  <img src="docs/images/codeman-tour-20260724.png" alt="Codeman 仪表盘导览：按项目分组的会话标签页、一键 Run 启动新智能体、页头实时用量" width="900">
 </p>
 
 > 本文档由英文版 [`README.md`](README.md) 翻译而来。如有出入，以英文版为准。