docs: add rustdocs for presence aggregation and suppression

src/service/presence/aggregate.rs

@@ -1,3 +1,9 @@
+//! Presence aggregation across devices.
+//!
+//! This module keeps per-device presence snapshots and computes a single
+//! user-level presence view. Aggregation applies idle/offline thresholds,
+//! favors higher-ranked states, and prunes stale devices to cap memory.
+
 use std::collections::HashMap;
 
 use ruma::{OwnedDeviceId, OwnedUserId, UInt, UserId, presence::PresenceState};
@@ -35,12 +41,15 @@ pub(crate) struct PresenceAggregator {
 }
 
 impl PresenceAggregator {
+	/// Create a new, empty aggregator.
 	pub(crate) fn new() -> Self { Self::default() }
 
+	/// Clear all tracked device state.
 	pub(crate) async fn clear(&self) {
 		self.inner.write().await.clear();
 	}
 
+	/// Update presence state for a single device.
 	pub(crate) async fn update(
 		&self,
 		user_id: &UserId,
@@ -76,6 +85,10 @@ impl PresenceAggregator {
 		}
 	}
 
+	/// Aggregate per-device state into a single presence snapshot.
+	///
+	/// Prunes devices that have not updated within the offline timeout to keep
+	/// the map bounded.
 	pub(crate) async fn aggregate(
 		&self,
 		user_id: &UserId,

src/service/pusher/suppressed.rs

@@ -1,3 +1,8 @@
+//! Deferred push suppression queues.
+//!
+//! Stores suppressed push events in memory until they can be flushed. This is
+//! intentionally in-memory only: suppressed events are discarded on restart.
+
 use std::collections::{HashMap, VecDeque};
 use std::sync::Mutex;
 
@@ -50,6 +55,7 @@ impl SuppressedQueue {
 	}
 }
 
+/// Enqueue a PDU for later push delivery when suppression is active.
 #[implement(super::Service)]
 pub fn queue_suppressed_push(
 	&self,
@@ -123,6 +129,7 @@ pub fn queue_suppressed_push(
 	true
 }
 
+/// Take and remove all suppressed PDUs for a given user + pushkey.
 #[implement(super::Service)]
 pub fn take_suppressed_for_pushkey(
 	&self,
@@ -149,6 +156,7 @@ pub fn take_suppressed_for_pushkey(
 		.collect()
 }
 
+/// Take and remove all suppressed PDUs for a given user across all pushkeys.
 #[implement(super::Service)]
 pub fn take_suppressed_for_user(
 	&self,
@@ -172,6 +180,7 @@ pub fn take_suppressed_for_user(
 		.collect()
 }
 
+/// Clear suppressed PDUs for a specific room (across all pushkeys).
 #[implement(super::Service)]
 pub fn clear_suppressed_room(&self, user_id: &UserId, room_id: &RoomId) -> usize {
 	let mut inner = self.suppressed.lock();
@@ -196,6 +205,7 @@ pub fn clear_suppressed_room(&self, user_id: &UserId, room_id: &RoomId) -> usize
 	removed
 }
 
+/// Clear suppressed PDUs for a specific pushkey.
 #[implement(super::Service)]
 pub fn clear_suppressed_pushkey(&self, user_id: &UserId, pushkey: &str) -> usize {
 	let mut inner = self.suppressed.lock();