Replace that POS defrag, update Algo names, fix tests, rework initial

algo.

README.md

@@ -41,13 +41,10 @@ This is still in very early development, so expect old maps to no longer work.
 
 ## Recovery Strategy
 
-### Initial Pass (Stage::Untested)
+### Initial Pass / Patchworking
 
-Tries to read clusters of `max_buffer_size`, marking clusters with errors as
-`ForIsolation` (note that the name has not yet be updated to
-`Patchwork{ depth }`).
-
-### Patchworking
+Tries to read clusters of `max_buffer_size`, marking clusters with errors with
+an increasing `level`.
 
 This works by halving the length of the read buffer until one of two
 conditions is met: