Add install script at atomic.bond/install

Shell script detects OS/arch, downloads the right binary from
GitHub releases, installs to /usr/local/bin. Supports curl and wget.
Restore atomic.bond/install URL in website hero and install section.

Author: hiteshjoshi

www/index.html

@@ -92,10 +92,8 @@ <h1 class="hero-heading">Domain identity for AI agents.</h1>
 			Your agent gets an Ed25519 keypair bound to its domain, a public identity document at <code class="ic">/.well-known/agent.json</code>, an encrypted vault, and a deposit box for receiving secrets. One binary, ~4MB, runs on the same box as the agent.
 		</p>
 
-		<pre class="code-block"><code><span class="code-comment"># Download from GitHub releases</span>
-curl -fsSL https://github.com/plotondev/atomic/releases/latest/download/atomic-$(uname -m)-$(uname -s | tr A-Z a-z) -o atomic
-chmod +x atomic
-./atomic init --domain fin.acme.com</code></pre>
+		<pre class="code-block"><code>curl -fsSL atomic.bond/install | sh
+atomic init --domain fin.acme.com</code></pre>
 
 		<div class="cta-row">
 			<a href="https://github.com/plotondev/atomic/releases" class="cta-btn">Download</a>
@@ -250,9 +248,8 @@ <h2 class="section-heading" id="security">Security</h2>
 
 		<h2 class="section-heading" id="install">Install</h2>
 
-		<pre class="code-block"><code><span class="code-comment"># Download the latest release</span>
-curl -fsSL https://github.com/plotondev/atomic/releases/latest/download/atomic-$(uname -m)-$(uname -s | tr A-Z a-z) -o atomic
-chmod +x atomic && sudo mv atomic /usr/local/bin/
+		<pre class="code-block"><code><span class="code-comment"># One-line install</span>
+curl -fsSL atomic.bond/install | sh
 
 <span class="code-comment"># Or build from source</span>
 git clone https://github.com/plotondev/atomic.git

www/install

@@ -0,0 +1,46 @@
+#!/bin/sh
+set -e
+
+REPO="plotondev/atomic"
+INSTALL_DIR="/usr/local/bin"
+
+# Detect OS
+OS=$(uname -s | tr '[:upper:]' '[:lower:]')
+case "$OS" in
+    linux)  OS="linux" ;;
+    darwin) OS="macos" ;;
+    *)      echo "Unsupported OS: $OS" >&2; exit 1 ;;
+esac
+
+# Detect arch
+ARCH=$(uname -m)
+case "$ARCH" in
+    x86_64|amd64)   ARCH="x86_64" ;;
+    aarch64|arm64)   ARCH="aarch64" ;;
+    *)               echo "Unsupported architecture: $ARCH" >&2; exit 1 ;;
+esac
+
+BINARY="atomic-${ARCH}-${OS}"
+URL="https://github.com/${REPO}/releases/latest/download/${BINARY}"
+
+echo "Downloading atomic for ${OS}/${ARCH}..."
+if command -v curl >/dev/null 2>&1; then
+    curl -fsSL "$URL" -o /tmp/atomic
+elif command -v wget >/dev/null 2>&1; then
+    wget -q "$URL" -O /tmp/atomic
+else
+    echo "Error: curl or wget required" >&2
+    exit 1
+fi
+
+chmod +x /tmp/atomic
+
+if [ -w "$INSTALL_DIR" ]; then
+    mv /tmp/atomic "$INSTALL_DIR/atomic"
+else
+    echo "Installing to ${INSTALL_DIR} (requires sudo)..."
+    sudo mv /tmp/atomic "$INSTALL_DIR/atomic"
+fi
+
+echo "atomic installed to ${INSTALL_DIR}/atomic"
+atomic --version