docs(plan): 14.1 —— 把影响面写清楚,免得严重性被读高

Author: speak-agent

.agents/docs/2026-09-07-module-first-heterogeneous-surface.md

@@ -1096,6 +1096,13 @@ after:  bytes=1480          and `Finished dev in 0.06s` -- nothing rebuilt at al
 That is what a consumer of the published packages gets today, which is why the
 fixture measurement alone was not treated as sufficient.
 
+**The blast radius, stated so the severity is not overread.** `header` is the
+default and `object` is what a project opts into above roughly 1 MB of total
+payload (3.1). Nothing in `examples/` uses it, and the only consumers that do
+are this collection's own fixtures. So the defect is real, silent and
+artifact-corrupting, and it reaches a project only after that project chose the
+non-default storage.
+
 **This is not a discovery, and that is the more useful half of it.** Section 4.3
 stated the requirement -- "the payload must be declared as an action input
 explicitly" -- before any of this was written. What it added was five more