fix: Resolve import test failures and add git to Nix build

- Remove broken import special case that created vc.db instead of using found database
- Add git to nativeBuildInputs in default.nix for tests
- Fix path comparison bug (symlink resolution caused prefix mismatch)

cmd/bd/main.go

@@ -5,7 +5,6 @@ import (
 	"os"
 	"path/filepath"
 	"slices"
-	"strings"
 	"sync"
 	"time"
 
@@ -154,45 +153,16 @@ var rootCmd = &cobra.Command{
 
 		// Initialize database path
 		if dbPath == "" {
-			cwd, err := os.Getwd()
-			localBeadsDir := ""
-			if err == nil {
-				localBeadsDir = filepath.Join(cwd, ".beads")
-			}
-
-			// Use public API to find database (same logic as extensions)
-			if foundDB := beads.FindDatabasePath(); foundDB != "" {
-				dbPath = foundDB
-
-				// Special case for import: if we found a database but there's a local .beads/
-				// directory without a database, prefer creating a local database
-				if cmd.Name() == cmdImport && localBeadsDir != "" {
-					if _, err := os.Stat(localBeadsDir); err == nil {
-						// Check if found database is NOT in the local .beads/ directory
-						if !strings.HasPrefix(dbPath, localBeadsDir+string(filepath.Separator)) {
-							// Use local .beads/vc.db instead for import
-							dbPath = filepath.Join(localBeadsDir, "vc.db")
-						}
-					}
-				}
-			} else {
-				// For import command, allow creating database if .beads/ directory exists
-				if cmd.Name() == cmdImport && localBeadsDir != "" {
-					if _, err := os.Stat(localBeadsDir); err == nil {
-						// .beads/ directory exists - set dbPath for import to create
-						dbPath = filepath.Join(localBeadsDir, "vc.db")
-					}
-				}
-
-				// If dbPath still not set, error out
-				if dbPath == "" {
-					// No database found - error out instead of falling back to ~/.beads
-					fmt.Fprintf(os.Stderr, "Error: no beads database found\n")
-					fmt.Fprintf(os.Stderr, "Hint: run 'bd init' to create a database in the current directory\n")
-					fmt.Fprintf(os.Stderr, "      or set BEADS_DB environment variable to specify a database\n")
-					os.Exit(1)
-				}
-			}
+		// Use public API to find database (same logic as extensions)
+		if foundDB := beads.FindDatabasePath(); foundDB != "" {
+		 dbPath = foundDB
+		} else {
+		 // No database found - error out instead of falling back to ~/.beads
+			fmt.Fprintf(os.Stderr, "Error: no beads database found\n")
+		 fmt.Fprintf(os.Stderr, "Hint: run 'bd init' to create a database in the current directory\n")
+		 fmt.Fprintf(os.Stderr, "      or set BEADS_DB environment variable to specify a database\n")
+		os.Exit(1)
+		}
 		}
 
 		// Set actor from flag, viper (env), or default