add reminder ops to the in-agent socket protocol (#2635 inc 1)

hive-agent-sock/src/lib.rs

@@ -1,14 +1,15 @@
 //! Wire types for the *in-agent* socket, served by the hive-agent harness
 //! to the in-container producers (matrix / bash MCP daemons) and
-//! `forge_notify`. Currently carries the loose-ends-v2 *todo* op family;
-//! more in-agent request families may be added over time (the socket is
-//! deliberately named for the agent, not the todos).
+//! `forge_notify`. Carries the loose-ends-v2 *todo* op family plus the
+//! harness-local *reminder* op family (#2635 increment 1); more in-agent
+//! request families may be added over time (the socket is deliberately
+//! named for the agent, not the todos).
 //!
 //! Distinct from `hive-core-agent-sock`, the *host*-served core↔agent
 //! protocol on `/run/hive/mcp.sock`: this socket never leaves the
-//! container. The harness owns the todo store locally and signals its own
-//! turn loop directly, so hive-c0re is not in the todo path — no broker
-//! round-trip, no long-poll, no marker files.
+//! container. The harness owns the todo + reminder stores locally and
+//! signals its own turn loop directly, so hive-c0re is not in either path —
+//! no broker round-trip, no long-poll, no marker files.
 
 use serde::{Deserialize, Serialize};
 
@@ -58,6 +59,25 @@ pub enum Request {
     },
     /// The agent marks one of its own todos done, by id.
     MarkTodoDone { id: i64 },
+    /// Schedule a reminder that fires into this agent's own turn loop at
+    /// `timing` (harness-local — no broker round-trip). Same semantics as
+    /// the old broker `Remind` request. `file_path`, when set, is where the
+    /// harness persists an over-cap body instead of inlining it.
+    StoreReminder {
+        message: String,
+        timing: hive_sh4re::ReminderTiming,
+        #[serde(default, skip_serializing_if = "Option::is_none")]
+        file_path: Option<String>,
+    },
+    /// List this agent's pending reminders (single-agent scope — unlike
+    /// the old broker query, there's no cross-agent `agent` filter here).
+    ListReminders,
+    /// Cancel one of this agent's own pending reminders by id, before it
+    /// fires.
+    CancelReminder { id: i64 },
+    /// This agent's pending-reminder count — used by the pre-`remind` cap
+    /// check and the harness's own turn-stats sink.
+    CountPendingReminders,
 }
 
 /// A response on the in-agent socket. Serialised with a `kind` tag,
@@ -69,8 +89,11 @@ pub enum Response {
     Ok,
     /// Op succeeded and touched `count` rows (clear / mark-done).
     Acked { count: u64 },
-    /// `ListTodos` result.
+    /// `ListTodos` / `ListReminders` result (the latter wraps each row as
+    /// [`LooseEnd::Reminder`]).
     LooseEnds { loose_ends: Vec<LooseEnd> },
+    /// `CountPendingReminders` result.
+    PendingRemindersCount { count: u64 },
     /// Op failed; `message` is operator-facing.
     Err { message: String },
 }