Trim negative-space comments per mara's review

Don't state what a function/module doesn't do and where that
happens instead — just describe what it does. Cut the "not
something this function decides" / "not affected by this" /
"not a placeholder for a later commit" asides from the doc
comments touched in the last two commits.

hive-agent/src/term_msg.rs

@@ -106,8 +106,7 @@ impl TermMsg {
 /// actually returned, not across the live/history boundary. Accepted
 /// degradation — the only user-visible effect is a `recv` result whose
 /// `tool_use` fell on the other side of a page/reconnect boundary rendering
-/// its body as plain text instead of markdown (open/collapsed state is a
-/// uniform client-side preference either way, not affected by this).
+/// its body as plain text instead of markdown.
 #[derive(Default)]
 pub struct ClassifyCtx {
     tool_name_by_id: HashMap<String, String>,