add unique-type-churn transcript

unison-src/transcripts/unique-type-churn.md

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+This transcript demonstrates that unique types no longer always get a fresh GUID: they share GUIDs with already-saved
+unique types of the same name.
+
+```unison
+unique type A = A
+
+unique type B = B C
+unique type C = C B
+```
+
+```ucm
+.> add
+```
+
+```unison
+unique type A = A
+
+unique type B = B C
+unique type C = C B
+```

unison-src/transcripts/unique-type-churn.output.md

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+This transcript demonstrates that unique types no longer always get a fresh GUID: they share GUIDs with already-saved
+unique types of the same name.
+
+```unison
+unique type A = A
+
+unique type B = B C
+unique type C = C B
+```
+
+```ucm
+
+  I found and typechecked these definitions in scratch.u. If you
+  do an `add` or `update`, here's how your codebase would
+  change:
+  
+    ⍟ These new definitions are ok to `add`:
+    
+      unique type A
+      unique type B
+      unique type C
+
+```
+```ucm
+.> add
+
+  ⍟ I've added these definitions:
+  
+    unique type A
+    unique type B
+    unique type C
+
+```
+```unison
+unique type A = A
+
+unique type B = B C
+unique type C = C B
+```
+
+```ucm
+
+  I found and typechecked the definitions in scratch.u. This
+  file has been previously added to the codebase.
+
+```