Add Agent Mail multi-workspace deployment guide and scripts

- docs/AGENT_MAIL_DEPLOYMENT.md: 10-step deployment plan for 13 workspaces
- docs/AGENT_MAIL_MULTI_WORKSPACE_SETUP.md: Architecture and configuration guide
- scripts/setup-agent-mail-workspace.sh: Auto-configure .envrc per workspace
- scripts/start-agent-mail-server.sh: Start Agent Mail server
- scripts/stop-agent-mail-server.sh: Stop Agent Mail server
- scripts/agent-mail-status.sh: Monitor server and all channels

Supports 3-channel setup: beads.dev, vc.dev, wyvern.dev
Ready for 0.23.0 deployment with Agent Mail integration

Amp-Thread-ID: https://ampcode.com/threads/T-bc960efb-3ddc-4635-8c8e-a42a6e9e67d9
Co-authored-by: Amp <amp@ampcode.com>

scripts/stop-agent-mail-server.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+# Stop Agent Mail server
+# Usage: ./stop-agent-mail-server.sh
+
+PID_FILE="${AGENT_MAIL_PID:-$HOME/agent-mail.pid}"
+
+if [[ ! -f "$PID_FILE" ]]; then
+    echo "⚠️  No PID file found: $PID_FILE"
+    echo "   Attempting to kill by process name..."
+    
+    if pkill -f "mcp_agent_mail.cli serve-http"; then
+        echo "✅ Killed Agent Mail server by process name"
+    else
+        echo "ℹ️  No Agent Mail server process found"
+    fi
+    exit 0
+fi
+
+PID=$(cat "$PID_FILE")
+
+if ! ps -p "$PID" > /dev/null 2>&1; then
+    echo "⚠️  Process $PID not running (stale PID file)"
+    rm -f "$PID_FILE"
+    exit 0
+fi
+
+echo "🛑 Stopping Agent Mail server (PID: $PID)..."
+kill "$PID"
+
+# Wait for graceful shutdown
+for i in {1..5}; do
+    if ! ps -p "$PID" > /dev/null 2>&1; then
+        echo "✅ Server stopped gracefully"
+        rm -f "$PID_FILE"
+        exit 0
+    fi
+    sleep 1
+done
+
+# Force kill if needed
+if ps -p "$PID" > /dev/null 2>&1; then
+    echo "⚠️  Server didn't stop gracefully, forcing..."
+    kill -9 "$PID"
+    sleep 1
+fi
+
+if ! ps -p "$PID" > /dev/null 2>&1; then
+    echo "✅ Server stopped (forced)"
+    rm -f "$PID_FILE"
+else
+    echo "❌ Failed to stop server"
+    exit 1
+fi