diff --git a/LANGUAGE-POLICY.adoc b/LANGUAGE-POLICY.adoc
index 6f4c4b6ae..19524f3f9 100644
--- a/LANGUAGE-POLICY.adoc
+++ b/LANGUAGE-POLICY.adoc
@@ -27,8 +27,10 @@ Ordered preference. Reach for the first one that can do the job.
   built-in test runner and bundler.
 
 | 2 | *Deno*
-| Second position. Existing Deno projects are *grandfathered* and need not
-  migrate; prefer it over pnpm/npm when Bun genuinely cannot be used.
+| *BEING REMOVED* (owner ruling 2026-08-26, #655): existing Deno projects
+  must migrate to Bun; where Bun genuinely cannot be used, the reason must
+  be documented. Ranked second only while the estate migration is in
+  flight — not a safe harbour.
 
 | 3 | *pnpm*
 | Third. Only where an upstream toolchain requires a node_modules layout.
diff --git a/docs/JS-RUNTIME-POLICY.adoc b/docs/JS-RUNTIME-POLICY.adoc
index 701790f00..84ae4b2b1 100644
--- a/docs/JS-RUNTIME-POLICY.adoc
+++ b/docs/JS-RUNTIME-POLICY.adoc
@@ -42,8 +42,10 @@ built-in test runner and bundler.
 
 | 2
 | *Deno*
-| Second position.  Existing Deno projects are *grandfathered* and need not
-migrate; prefer it over pnpm/npm where Bun genuinely cannot be used.
+| *BEING REMOVED* (owner ruling 2026-08-26, #655):  existing Deno projects
+must migrate to Bun; where Bun genuinely cannot be used, the reason must be
+documented.  Ranked second only while the estate migration is in flight —
+not a safe harbour.
 
 | 3
 | *pnpm*