fix(daemon): complete socket path shortening for long workspace paths (GH#1001) (#1008)

fix(daemon): socket path shortening for long workspace paths

Fixes GH#1001 where long workspace paths (e.g., pytest temp directories) caused
socket path mismatches. The daemon now uses rpc.ShortSocketPath() consistently
with the client.

Changes:
- daemon.go: Use rpc.ShortSocketPath() + EnsureSocketDir() for daemon socket
- daemon_config.go: Update getSocketPathForPID() to use rpc.ShortSocketPath()
- Added tests for long path handling and client-daemon socket path agreement

Co-Authored-By: Eugene Sukhodolin <sukhodolin@users.noreply.github.com>

cmd/bd/daemon_config.go

@@ -7,6 +7,7 @@ import (
 	"strconv"
 
 	"github.com/steveyegge/beads/internal/beads"
+	"github.com/steveyegge/beads/internal/rpc"
 )
 
 // ensureBeadsDir ensures the local beads directory exists (.beads in the current workspace)
@@ -60,13 +61,16 @@ func getEnvBool(key string, defaultValue bool) bool {
 
 // getSocketPathForPID determines the socket path for a given PID file.
 // If BD_SOCKET env var is set, uses that value instead.
+// Uses rpc.ShortSocketPath to avoid Unix socket path length limits (macOS: 104 chars).
 func getSocketPathForPID(pidFile string) string {
 	// Check environment variable first (enables test isolation)
 	if socketPath := os.Getenv("BD_SOCKET"); socketPath != "" {
 		return socketPath
 	}
-	// Socket is in same directory as PID file
-	return filepath.Join(filepath.Dir(pidFile), "bd.sock")
+	// PID file is in .beads/, so workspace is parent of that
+	beadsDir := filepath.Dir(pidFile)
+	workspacePath := filepath.Dir(beadsDir)
+	return rpc.ShortSocketPath(workspacePath)
 }
 
 // getPIDFilePath returns the path to the daemon PID file