Initial commit: waste-go skeleton

Ed25519/X25519/ChaCha20-Poly1305 crypto, peer handshake, mesh state,
IPC server, relay server, and NAT stub. Builds clean on Go 1.22+.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

cmd/daemon/main.go

@@ -0,0 +1,74 @@
+// waste-daemon: the local peer process.
+// Run one of these on each friend's machine.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"os"
+
+	"github.com/waste-go/internal/crypto"
+	"github.com/waste-go/internal/ipc"
+	"github.com/waste-go/internal/mesh"
+	"github.com/waste-go/internal/nat"
+)
+
+func main() {
+	dataDir  := flag.String("data-dir", "~/.waste", "path to identity/config directory")
+	alias    := flag.String("alias", "anon", "display name shown to peers (advisory only)")
+	peerPort := flag.Int("peer-port", 17338, "port to accept incoming peer connections")
+	ipcPort  := flag.Int("ipc-port", 17337, "port for local IPC (UI connects here)")
+	relay    := flag.String("relay", "", "optional relay server address (host:port)")
+	flag.Parse()
+
+	// Load or generate identity keypair
+	id, err := crypto.LoadOrCreate(expandHome(*dataDir), *alias)
+	if err != nil {
+		log.Fatalf("identity: %v", err)
+	}
+	log.Printf("daemon: local peer id: %s  alias: %s", id.PeerID().Short(), id.Alias)
+
+	// Shared mesh state
+	m := mesh.New(id)
+
+	// Peer listener (inbound connections from other nodes)
+	go func() {
+		addr := fmt.Sprintf("0.0.0.0:%d", *peerPort)
+		ln, err := net.Listen("tcp", addr)
+		if err != nil {
+			log.Fatalf("peer listener: %v", err)
+		}
+		log.Printf("daemon: listening for peers on %s", addr)
+		for {
+			conn, err := ln.Accept()
+			if err != nil {
+				log.Printf("peer accept error: %v", err)
+				continue
+			}
+			go mesh.HandleConn(conn, m, false)
+		}
+	}()
+
+	// NAT traversal / relay client
+	go func() {
+		if err := nat.Run(m, *relay); err != nil {
+			log.Printf("nat: %v", err)
+		}
+	}()
+
+	// IPC server — blocks until error
+	if err := ipc.Run(m, *ipcPort); err != nil {
+		log.Fatalf("ipc: %v", err)
+	}
+}
+
+func expandHome(path string) string {
+	if len(path) >= 2 && path[:2] == "~/" {
+		if home, err := os.UserHomeDir(); err == nil {
+			return home + path[1:]
+		}
+	}
+	return path
+}