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

docs/model-and-effort-selection.md

@@ -48,11 +48,6 @@ tokens are, which makes it the tempting one to run cheaper. It is also the row w
 settled answer: a build phase of this stack reads a lot of the tree, and a smaller context window
 does not hold it - it runs into compaction, which costs more than the cheaper model saves. Sonnet
 at high effort remains possible, but only as a session of its own (below).
-<!-- dist:strip-start -->
-Which default the middle row should have is left to the record: every closed work package in this
-repo names the model, effort and session shape of each phase, and the table follows that evidence
-rather than the other way round.
-<!-- dist:strip-end -->
 
 **Effort is the cheaper lever than the model.** A reduced effort level is what gives up
 multi-file consistency first, so `high` is a reasonable floor for anything touching more than one
@@ -115,8 +110,7 @@ choice a session *can* make on its own:
   once, an unchecked Sonnet phase can ship something nobody looks at again.
 - The phase changed and the session runs on a model or effort the table would not pick: keep
   working, and cut the session at the next handover rather than switching mid-flow - never block a
-  publish or an issue close on a choice the session cannot make itself. Naming which model and
-  effort ran which phase in the handover keeps the gap visible instead of silent.
+  publish or an issue close on a choice the session cannot make itself.
 
 ## Scope