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

hive-sh4re/src/lib.rs

@@ -24,6 +24,15 @@ pub const RECV_BATCH_MAX: u32 = 5;
 /// server (`recv` tool result) so both surfaces phrase it identically.
 pub const REDELIVERY_HINT: &str = "[redelivered after harness restart — may already be handled]\n";
 
+/// Banner prepended to a wake prompt when the previous turn was cut off by
+/// an explicit operator `/cancel` (SIGINT) rather than ending normally. Set
+/// once, read-and-cleared by the next turn's wake-prompt build — see
+/// `hive-agent`'s `post_cancel_turn` (sets it) and `handle_turn` (clears
+/// it). Lives here for the same reason as `REDELIVERY_HINT`: a single
+/// phrasing, not duplicated between call sites.
+pub const INTERRUPTED_HINT: &str = "[your previous turn was interrupted by the operator (/cancel) \
+     before it finished — check for new messages before resuming prior work]\n";
+
 /// Shared "(N more message(s) pending …)" advisory appended after both the
 /// wake prompt body and the `recv` tool result whenever the inbox still has
 /// queued messages once the current message/batch is popped. Returns an empty