brokerd: answers carry the Mattermost post; Table::contains

Implemented-By: OpenCode session (model recorded in docs/implementer-log.md)

crates/brokerd/src/approvals.rs

@@ -2,7 +2,7 @@
 //! gone. In memory only.
 
 use crate::policy::{Ask, Decision};
-use proto::{DenyReason, PendingApproval, Timestamp};
+use proto::{DecisionRecord, DenyReason, PendingApproval, Timestamp};
 use std::collections::BTreeMap;
 use std::sync::mpsc::{Receiver, Sender, channel};
 use std::sync::{Mutex, MutexGuard};
@@ -14,6 +14,29 @@ pub enum Verdict {
     Denied(DenyReason),
 }
 
+/// An owner's answer to a pending call.
+#[derive(Debug, Clone, PartialEq, Eq)]
+pub enum Answer {
+    /// `by` is "bxctl" or a Mattermost user id; `post` the Mattermost post that answered.
+    Approved {
+        by: Option<String>,
+        post: Option<String>,
+    },
+    Refused {
+        by: Option<String>,
+        post: Option<String>,
+        reason: Option<String>,
+    },
+    Expired,
+}
+
+/// What an approval leaves: the verdict (run or deny) and the record written.
+#[derive(Debug)]
+pub struct Answered {
+    pub verdict: Verdict,
+    pub outcome: DecisionRecord,
+}
+
 #[derive(Debug)]
 pub struct Entry {
     pub info: PendingApproval,
@@ -52,6 +75,11 @@ impl Table {
         receiver
     }
 
+    /// Is approval `id` still pending? Only a hint: it may be taken the moment after.
+    pub fn contains(&self, id: u64) -> bool {
+        self.lock().contains_key(&id)
+    }
+
     pub fn take(&self, id: u64) -> Option<Entry> {
         self.lock().remove(&id)
     }