fix(#1375): clean up pedantic warnings and re-enable -D warnings without pedantic bypass

hive-matrix-mcp/src/client.rs

@@ -46,6 +46,12 @@ struct WhoamiResponse {
 ///    session to call whoami).
 /// 3. Build the real Client with the sqlite store + `restore_session`
 ///    using a synthetic `MatrixSession`.
+///
+/// # Errors
+///
+/// Returns an error if the token file is missing or empty, if the
+/// `whoami` request fails, or if the matrix-sdk client fails to build
+/// or restore the session.
 pub async fn build_and_restore(
     homeserver: &str,
     token_file: &Path,

hive-matrix-mcp/src/wake.rs

@@ -33,6 +33,11 @@ pub const WAKE_BODY_TRUNCATE: usize = 100;
 /// `#[serde(tag = "cmd", rename_all = "snake_case")]`.  Must be `"cmd"`,
 /// not `"kind"` — the harness deserialises against the hive-sh4re type
 /// and silently discards requests that don't match.
+///
+/// # Errors
+///
+/// Returns an error on socket connect failure, serialisation failure,
+/// or I/O error writing to or reading from the socket.
 pub async fn send_wake(socket: &Path, body: impl AsRef<str>) -> Result<()> {
     use tokio::io::AsyncBufReadExt;
 
@@ -117,6 +122,7 @@ pub fn format_unread_summary(rooms: &[crate::protocol::RoomUnread]) -> String {
 /// Truncate `s` to `max` Unicode chars, appending `…` when cut.
 /// Char-based not byte-based so multi-byte content (most chat) doesn't
 /// get cut mid-codepoint.
+#[must_use]
 pub fn truncate_chars(s: &str, max: usize) -> String {
     let mut end = s.len();
     for (count, (i, _)) in s.char_indices().enumerate() {