terminal: drop stale ask/answer references in comments and docs

mara, on #3791: "also ask/answer was removed, so any references are
stale and can be removed afaik" — confirmed: no code anywhere
references those tool names anymore (the rich-markdown classification
is generic, gated on _category/_body_type stamped server-side, not a
per-tool-name check), just two leftover comment/doc mentions.

frontend/packages/agent/src/lib/classifyEvent.ts

@@ -172,8 +172,8 @@ function classifyStream(v: AnyEvent, fromHistory: boolean, ctx: ClassifyCtx): St
 }
 
 // `_category === 'rich'` tools get an expandable row: diff body (Edit),
-// default-open markdown body (send/ask/answer/recv-shaped, always open
-// regardless of the preference below — matches app.js), or a plain
+// default-open markdown body (send/recv-shaped, always open regardless
+// of the preference below — matches app.js), or a plain
 // body (collapsed unless the operator's "expand tool output" preference
 // says otherwise — @hive/shared/prefs.js's getExpandDetailsPref(), read
 // fresh per row so a mid-session preference change applies going