hive-agent: surface an interrupted-turn banner in the wake prompt after /cancel

hive-agent/src/serve_common.rs

@@ -12,7 +12,11 @@ use crate::turn_stats::TurnStatRow;
 /// system prompt; this is just the wake signal body. `id` is the broker row
 /// id, rendered as a `[msg #<id>]` marker so the agent can reference it in
 /// `ack_until`. `unread` is the inbox depth after this message was popped.
-/// `redelivered` prepends a "may already be handled" banner.
+/// `redelivered` prepends a "may already be handled" banner; `interrupted`
+/// prepends a "previous turn was /cancel'd" banner instead (the two are
+/// mutually exclusive in practice — a redelivered message means the harness
+/// itself restarted, which also clears the in-memory interrupted flag — so
+/// `redelivered` takes priority if both were somehow set).
 #[must_use]
 pub fn format_wake_prompt(
     id: i64,
@@ -20,9 +24,12 @@ pub fn format_wake_prompt(
     body: &str,
     unread: u64,
     redelivered: bool,
+    interrupted: bool,
 ) -> String {
     let banner = if redelivered {
         hive_sh4re::REDELIVERY_HINT
+    } else if interrupted {
+        hive_sh4re::INTERRUPTED_HINT
     } else {
         ""
     };