Cleanup dead code and missing imports

src/syndicate/actors.nim

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Unlicense
 
 import std/[asyncdispatch, deques, hashes, monotimes, options, sets, tables, times]
-import preserves, preserves/parse
+import preserves
 import ../syndicate/protocols/[protocol, sturdy]
 
 export Handle

src/syndicate/dataspaces.nim

@@ -7,8 +7,6 @@ import ./actors, ./protocols/dataspace, ./skeletons
 
 from ./protocols/protocol import Handle
 
-template trace(args: varargs[untyped]): untyped = stderr.writeLine(args)
-
 type
   Observe = dataspace.Observe[Ref]
   Turn = actors.Turn

src/syndicate/relays.nim

@@ -2,7 +2,7 @@
 # SPDX-License-Identifier: Unlicense
 
 import std/[asyncdispatch, options, tables]
-import preserves, preserves/parse
+import preserves
 import ./actors, ./durings, ./membranes, ./protocols/[protocol, sturdy]
 
 from ./patterns import grab