docs(readme): announce the native Agency Agents app (#621)

The catalog now has a native desktop app (macOS/Linux/Windows) that
browses the whole roster and installs it into Claude Code, Cursor,
Codex, Gemini, Osaurus and more — no clone, no scripts, auto-updating.

- Add a top callout banner + a "Download app" release shield for discovery.
- Lead Quick Start with "Option 1: Install the app (Recommended)"; the
  CLI paths shift down one (Claude Code → Option 2, Reference → 3,
  Other Tools → 4) and stay intact for command-line users.

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -6,6 +6,13 @@
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg)](https://makeapullrequest.com)
 [![Sponsor](https://img.shields.io/badge/Sponsor-%E2%9D%A4-pink?logo=github)](https://github.com/sponsors/msitarzewski)
+[![Download the app](https://img.shields.io/github/v/release/msitarzewski/agency-agents-app?label=Download%20app&color=2563eb)](https://github.com/msitarzewski/agency-agents-app/releases/latest)
+
+> ### 🆕 There's an app now
+>
+> **[Agency Agents](https://agencyagents.app)** is a native app for **macOS, Linux & Windows** that browses the entire roster and installs it into Claude Code, Cursor, Codex, Gemini, Osaurus, and more — with a click. No clone, no scripts, and it auto-updates.
+>
+> **→ [Download the latest release](https://github.com/msitarzewski/agency-agents-app/releases/latest) · [agencyagents.app](https://agencyagents.app)**
 
 ---
 
@@ -24,7 +31,19 @@ Born from a Reddit thread and months of iteration, **The Agency** is a growing c
 
 ## ⚡ Quick Start
 
-### Option 1: Use with Claude Code (Recommended)
+### Option 1: Install the app (Recommended)
+
+The fastest way in — no clone, no terminal. [**Agency Agents**](https://agencyagents.app) is a native desktop app (macOS · Linux · Windows) that browses the whole roster and installs agents into Claude Code, Cursor, Codex, Gemini CLI, OpenCode, Qwen, and Osaurus for you, then keeps them up to date.
+
+**[⬇ Download the latest release](https://github.com/msitarzewski/agency-agents-app/releases/latest)** — or on a Mac:
+
+```bash
+brew install --cask msitarzewski/agency-agents/agency-agents
+```
+
+Prefer the command line? The script-based options below install the same agents.
+
+### Option 2: Use with Claude Code
 
 ```bash
 # Install all agents to your Claude Code directory
@@ -37,7 +56,7 @@ cp engineering/*.md ~/.claude/agents/
 # "Hey Claude, activate Frontend Developer mode and help me build a React component"
 ```
 
-### Option 2: Use as Reference
+### Option 3: Use as Reference
 
 Each agent file contains:
 - Identity & personality traits
@@ -47,7 +66,7 @@ Each agent file contains:
 
 Browse the agents below and copy/adapt the ones you need!
 
-### Option 3: Use with Other Tools (GitHub Copilot, Antigravity, Gemini CLI, OpenCode, OpenClaw, Cursor, Aider, Windsurf, Kimi Code, Codex)
+### Option 4: Use with Other Tools (GitHub Copilot, Antigravity, Gemini CLI, OpenCode, OpenClaw, Cursor, Aider, Windsurf, Kimi Code, Codex)
 
 ```bash
 # Step 1 -- generate integration files for all supported tools