docs: stack-close no longer records which model and effort ran each phase (#170)

Files changed:
- CHANGES.md
- VERSION
- docs/model-and-effort-selection.md
- instructions/dev/stack-close/SKILL.md
- instructions/dev/stack-mode.md

instructions/dev/stack-mode.md

@@ -118,5 +118,4 @@ next phase's slash command in a session started on the right model - and the tra
 what carries the work across it.
 
 Which model suits which phase, and the reasoning, is
-`docs/model-and-effort-selection.md`. What every phase records, so that reasoning can be checked
-against practice, is `stack-close`'s handover (its own step 4).
+`docs/model-and-effort-selection.md`.