refactor(test): replace testify with stdlib in daemon tests (#936)

The daemon socket tests relied on an external assertion library, which
increased the module's dependency footprint and deviated from Go's
idiomatic testing patterns.

This commit introduces a leaner testing approach using the standard
library:
- Replace testify/assert calls with standard if checks and t.Errorf
- Remove testify and associated indirects from go.mod

These changes preserve existing test behavior while simplifying the
build process and reducing external maintenance overhead.

cmd/bd/daemon_socket_test.go

@@ -2,9 +2,8 @@ package main
 
 import (
 	"path/filepath"
+	"strings"
 	"testing"
-
-	"github.com/stretchr/testify/assert"
 )
 
 // TestSocketPathEnvOverride verifies that BD_SOCKET env var overrides default socket path.
@@ -18,7 +17,9 @@ func TestSocketPathEnvOverride(t *testing.T) {
 
 	// Verify getSocketPath returns custom path
 	got := getSocketPath()
-	assert.Equal(t, customSocket, got)
+	if got != customSocket {
+		t.Errorf("getSocketPath() = %q, want %q", got, customSocket)
+	}
 }
 
 // TestSocketPathForPIDEnvOverride verifies that BD_SOCKET env var overrides PID-derived path.
@@ -33,7 +34,9 @@ func TestSocketPathForPIDEnvOverride(t *testing.T) {
 	// Verify getSocketPathForPID returns custom path (ignoring pidFile)
 	pidFile := "/some/other/path/daemon.pid"
 	got := getSocketPathForPID(pidFile)
-	assert.Equal(t, customSocket, got)
+	if got != customSocket {
+		t.Errorf("getSocketPathForPID(%q) = %q, want %q", pidFile, got, customSocket)
+	}
 }
 
 // TestSocketPathDefaultBehavior verifies default behavior when BD_SOCKET is not set.
@@ -44,7 +47,10 @@ func TestSocketPathDefaultBehavior(t *testing.T) {
 	// Verify getSocketPathForPID derives from PID file path
 	pidFile := "/path/to/.beads/daemon.pid"
 	got := getSocketPathForPID(pidFile)
-	assert.Equal(t, "/path/to/.beads/bd.sock", got)
+	want := "/path/to/.beads/bd.sock"
+	if got != want {
+		t.Errorf("getSocketPathForPID(%q) = %q, want %q", pidFile, got, want)
+	}
 }
 
 // TestDaemonSocketIsolation demonstrates that two test instances can use different sockets.
@@ -66,10 +72,14 @@ func TestDaemonSocketIsolation(t *testing.T) {
 			t.Setenv("BD_SOCKET", socketPath)
 
 			got := getSocketPath()
-			assert.Equal(t, socketPath, got)
+			if got != socketPath {
+				t.Errorf("getSocketPath() = %q, want %q", got, socketPath)
+			}
 
 			// Verify paths are unique per instance
-			assert.Contains(t, got, tt.sockSuffix)
+			if !strings.Contains(got, tt.sockSuffix) {
+				t.Errorf("getSocketPath() = %q, want it to contain %q", got, tt.sockSuffix)
+			}
 		})
 	}
 }

go.mod

@@ -15,7 +15,6 @@ require (
 	github.com/olebedev/when v1.1.0
 	github.com/spf13/cobra v1.10.2
 	github.com/spf13/viper v1.21.0
-	github.com/stretchr/testify v1.11.1
 	github.com/tetratelabs/wazero v1.11.0
 	golang.org/x/mod v0.31.0
 	golang.org/x/sys v0.39.0
@@ -37,7 +36,6 @@ require (
 	github.com/charmbracelet/x/cellbuf v0.0.13 // indirect
 	github.com/charmbracelet/x/exp/strings v0.0.0-20240722160745-212f7b056ed0 // indirect
 	github.com/charmbracelet/x/term v0.2.1 // indirect
-	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
@@ -53,7 +51,6 @@ require (
 	github.com/ncruces/julianday v1.0.0 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/pkg/errors v0.8.1 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
 	github.com/sagikazarmark/locafero v0.11.0 // indirect
 	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect