Add step to run documented dependency-change follow-ups

skills/kotlin-tooling-immutable-collections-0-5-x-migration/SKILL.md

@@ -12,7 +12,7 @@ description: >
 license: Apache-2.0
 metadata:
   author: JetBrains
-  version: "2.0.0"
+  version: "2.1.0"
 ---
 
 # kotlinx.collections.immutable 0.5.x Migration
@@ -110,6 +110,14 @@ itself still calls a deprecated member.) Doing this now matters: at 0.6.0 the ol
 become compile errors, and at 0.7.0 they are removed. See [`0.5.0-MIGRATION.md`] for the
 upstream implementer guidance.
 
+### 6. Run any documented follow-up steps
+
+Some projects document steps to run after a dependency change that the compiler won't
+surface — most commonly regenerating dependency-verification metadata (the
+`gradle/verification-metadata.xml` hashes from step 3, via a prescribed command or script).
+Check `README.md` / `CONTRIBUTING.md` / `CLAUDE.md` / `AGENTS.md` for such a procedure, run
+it, and re-confirm the build is clean.
+
 ## Rename reference
 
 - **`PersistentCollection`** — `add`→`adding`, `addAll`→`addingAll`, `remove`→`removing`, `removeAll`→`removingAll`, `retainAll`→`retainingAll`, `clear`→`cleared`