Add RPC infrastructure and updated database

- RPC Phase 1: Protocol, server, client implementation
- Updated renumber.go with proper text reference updates (3-phase approach)
- Clean database exported: 344 issues (bd-1 to bd-344)
- Added DAEMON_DESIGN.md documentation
- Updated go.mod/go.sum for RPC dependencies

Amp-Thread-ID: https://ampcode.com/threads/T-456af77c-8b7f-4004-9027-c37b95e10ea5
Co-authored-by: Amp <amp@ampcode.com>

internal/rpc/client_test.go

@@ -0,0 +1,115 @@
+package rpc
+
+import (
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestTryConnectNoSocket(t *testing.T) {
+	tmpDir := t.TempDir()
+	sockPath := filepath.Join(tmpDir, "nonexistent.sock")
+
+	client := TryConnect(sockPath)
+	if client != nil {
+		t.Error("Expected nil client when socket doesn't exist")
+	}
+}
+
+func TestTryConnectSuccess(t *testing.T) {
+	tmpDir := t.TempDir()
+	sockPath := filepath.Join(tmpDir, "test.sock")
+
+	store := &mockStorage{}
+	server := NewServer(store, sockPath)
+
+	if err := server.Start(); err != nil {
+		t.Fatalf("Failed to start server: %v", err)
+	}
+	defer server.Stop()
+
+	time.Sleep(100 * time.Millisecond)
+
+	client := TryConnect(sockPath)
+	if client == nil {
+		t.Fatal("Expected client to connect successfully")
+	}
+	defer client.Close()
+
+	if client.sockPath != sockPath {
+		t.Errorf("Expected sockPath %s, got %s", sockPath, client.sockPath)
+	}
+}
+
+func TestClientExecute(t *testing.T) {
+	tmpDir := t.TempDir()
+	sockPath := filepath.Join(tmpDir, "test.sock")
+
+	store := &mockStorage{}
+	server := NewServer(store, sockPath)
+
+	if err := server.Start(); err != nil {
+		t.Fatalf("Failed to start server: %v", err)
+	}
+	defer server.Stop()
+
+	time.Sleep(100 * time.Millisecond)
+
+	client := TryConnect(sockPath)
+	if client == nil {
+		t.Fatal("Failed to connect to server")
+	}
+	defer client.Close()
+
+	req, _ := NewRequest(OpList, map[string]string{"status": "open"})
+	resp, err := client.Execute(req)
+	if err != nil {
+		t.Fatalf("Execute failed: %v", err)
+	}
+
+	if resp.Success {
+		t.Error("Expected error response for unimplemented operation")
+	}
+}
+
+func TestClientMultipleRequests(t *testing.T) {
+	tmpDir := t.TempDir()
+	sockPath := filepath.Join(tmpDir, "test.sock")
+
+	store := &mockStorage{}
+	server := NewServer(store, sockPath)
+
+	if err := server.Start(); err != nil {
+		t.Fatalf("Failed to start server: %v", err)
+	}
+	defer server.Stop()
+
+	time.Sleep(100 * time.Millisecond)
+
+	client := TryConnect(sockPath)
+	if client == nil {
+		t.Fatal("Failed to connect to server")
+	}
+	defer client.Close()
+
+	for i := 0; i < 5; i++ {
+		req, _ := NewRequest(OpStats, nil)
+		resp, err := client.Execute(req)
+		if err != nil {
+			t.Fatalf("Execute %d failed: %v", i, err)
+		}
+		if resp == nil {
+			t.Fatalf("Execute %d returned nil response", i)
+		}
+	}
+}
+
+func TestSocketPath(t *testing.T) {
+	beadsDir := "/home/user/project/.beads"
+	expected := "/home/user/project/.beads/bd.sock"
+
+	result := SocketPath(beadsDir)
+	if result != expected {
+		t.Errorf("Expected %s, got %s", expected, result)
+	}
+}