feat(dolt): add server mode support for multi-client access

- Add dolt_mode, dolt_server_host, dolt_server_port fields to configfile.Config
- Add IsDoltServerMode(), GetDoltServerHost(), GetDoltServerPort() helpers
- Update factory to read server mode config and set Options accordingly
- Skip bootstrap in server mode (database lives on server)
- Pass Database name to dolt.Config for USE statement after connecting
- Disable dolt stats collection to avoid lock issues in embedded mode

This enables bd to connect to a running dolt sql-server (started via
'gt dolt start') instead of using embedded mode, allowing multi-client
access without file locking conflicts.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

internal/storage/dolt/store.go

@@ -262,6 +262,11 @@ func openEmbeddedConnection(ctx context.Context, cfg *Config) (*sql.DB, string,
 		return nil, "", fmt.Errorf("failed to connect to Dolt database after %d retries: %w", cfg.LockRetries, lastErr)
 	}
 
+	// Disable statistics collection to avoid stats subdatabase lock issues
+	// The stats database can cause "cannot update manifest: database is read only"
+	// errors when multiple processes access the embedded Dolt database
+	_, _ = db.ExecContext(ctx, "SET @@dolt_stats_enabled = 0")
+
 	return db, connStr, nil
 }
 

internal/storage/factory/factory.go

@@ -30,7 +30,7 @@ type Options struct {
 	// Dolt server mode options (federation)
 	ServerMode bool   // Connect to dolt sql-server instead of embedded
 	ServerHost string // Server host (default: 127.0.0.1)
-	ServerPort int    // Server port (default: 3306)
+	ServerPort int    // Server port (default: 3307)
 	ServerUser string // MySQL user (default: root)
 	Database   string // Database name for Dolt server mode (default: beads)
 }