Group the module crates under modules/

The service pseudo-clients and the ircd protocol link sat flat at the
repo root, mixed in with the daemon core and the SDK. Move them all
under modules/ so the tree separates concerns cleanly: the daemon in
src/, the SDK every module links against in api/, and the loadable
modules — the pseudo-clients plus the protocol link — in modules/.

Workspace members, the daemon's per-crate dependency paths, and each
module's api path are updated to match; the docs follow. No code change.

modules/memoserv/src/del.rs

@@ -0,0 +1,27 @@
+use fedserv_api::{Sender, ServiceCtx, Store};
+
+// DEL <num>|ALL: remove a memo (or the whole mailbox).
+pub fn handle(me: &str, from: &Sender, account: &str, args: &[&str], ctx: &mut ServiceCtx, db: &mut dyn Store) {
+    match args.get(1).map(|s| s.to_ascii_uppercase()).as_deref() {
+        Some("ALL") => {
+            let count = db.memo_list(account).len();
+            // Delete from the end so earlier indices stay valid as we go.
+            for i in (0..count).rev() {
+                db.memo_del(account, i);
+            }
+            ctx.notice(me, from.uid, format!("Deleted all \x02{count}\x02 memo(s)."));
+        }
+        Some(numstr) => {
+            let Some(n) = numstr.parse::<usize>().ok().filter(|n| *n >= 1) else {
+                ctx.notice(me, from.uid, "Syntax: DEL <num>|ALL");
+                return;
+            };
+            if db.memo_del(account, n - 1) {
+                ctx.notice(me, from.uid, format!("Memo #\x02{n}\x02 deleted."));
+            } else {
+                ctx.notice(me, from.uid, format!("You have no memo #\x02{n}\x02."));
+            }
+        }
+        None => ctx.notice(me, from.uid, "Syntax: DEL <num>|ALL"),
+    }
+}

modules/memoserv/src/lib.rs

@@ -0,0 +1,54 @@
+//! MemoServ delivers short messages ("memos") to registered accounts whether or
+//! not they are online — they read them next time they identify. Memos are typed
+//! and event-logged on the account, so they persist and federate like any other
+//! account data. `lib.rs` holds the dispatcher; each command lives in its own
+//! file, matching NickServ/ChanServ.
+
+use fedserv_api::{NetView, Sender, Service, ServiceCtx, Store};
+
+#[path = "send.rs"]
+mod send;
+#[path = "list.rs"]
+mod list;
+#[path = "read.rs"]
+mod read;
+#[path = "del.rs"]
+mod del;
+
+pub struct MemoServ {
+    pub uid: String,
+}
+
+impl Service for MemoServ {
+    fn nick(&self) -> &str {
+        "MemoServ"
+    }
+    fn uid(&self) -> &str {
+        &self.uid
+    }
+    fn gecos(&self) -> &str {
+        "Memo Services"
+    }
+
+    fn on_command(&mut self, from: &Sender, args: &[&str], ctx: &mut ServiceCtx, _net: &dyn NetView, db: &mut dyn Store) {
+        let me = self.uid.as_str();
+        let cmd = args.first().map(|s| s.to_ascii_uppercase());
+        if matches!(cmd.as_deref(), Some("HELP") | None) {
+            ctx.notice(me, from.uid, "MemoServ delivers messages to registered users, online or not. Commands: \x02SEND\x02 <nick> <text>, \x02LIST\x02, \x02READ\x02 <num>|NEW|ALL, \x02DEL\x02 <num>|ALL.");
+            return;
+        }
+        // Everything else needs you to be identified (memos are per-account).
+        let Some(account) = from.account else {
+            ctx.notice(me, from.uid, "You must identify to NickServ before using MemoServ.");
+            return;
+        };
+        match cmd.as_deref() {
+            Some("SEND") => send::handle(me, from, account, args, ctx, db),
+            Some("LIST") => list::handle(me, from, account, ctx, db),
+            Some("READ") => read::handle(me, from, account, args, ctx, db),
+            Some("DEL") | Some("DELETE") => del::handle(me, from, account, args, ctx, db),
+            Some(other) => ctx.notice(me, from.uid, format!("I don't know the command \x02{other}\x02. Try \x02HELP\x02.")),
+            None => {}
+        }
+    }
+}

modules/memoserv/src/list.rs

@@ -0,0 +1,26 @@
+use fedserv_api::{human_time, Sender, ServiceCtx, Store};
+
+// LIST: show every memo with a one-line preview; \x02*\x02 marks unread.
+pub fn handle(me: &str, from: &Sender, account: &str, ctx: &mut ServiceCtx, db: &dyn Store) {
+    let memos = db.memo_list(account);
+    if memos.is_empty() {
+        ctx.notice(me, from.uid, "You have no memos.");
+        return;
+    }
+    let unread = memos.iter().filter(|m| !m.read).count();
+    ctx.notice(me, from.uid, format!("Your memos ({} total, {unread} new). \x02*\x02 marks unread:", memos.len()));
+    for (i, m) in memos.iter().enumerate() {
+        let flag = if m.read { ' ' } else { '*' };
+        ctx.notice(me, from.uid, format!("  {}{flag} from \x02{}\x02 ({}): {}", i + 1, m.from, human_time(m.ts), preview(&m.text)));
+    }
+}
+
+// First line / first 80 chars, for LIST.
+fn preview(text: &str) -> String {
+    let line = text.lines().next().unwrap_or("");
+    if line.chars().count() > 80 {
+        format!("{}…", line.chars().take(80).collect::<String>())
+    } else {
+        line.to_string()
+    }
+}

modules/memoserv/src/read.rs

@@ -0,0 +1,42 @@
+use fedserv_api::{human_time, MemoView, Sender, ServiceCtx, Store};
+
+// READ <num>|NEW|ALL: display memos and mark them read.
+pub fn handle(me: &str, from: &Sender, account: &str, args: &[&str], ctx: &mut ServiceCtx, db: &mut dyn Store) {
+    match args.get(1).map(|s| s.to_ascii_uppercase()).as_deref() {
+        Some("NEW") | Some("ALL") => {
+            let only_new = args[1].eq_ignore_ascii_case("new");
+            let targets: Vec<usize> = db
+                .memo_list(account)
+                .iter()
+                .enumerate()
+                .filter(|(_, m)| !only_new || !m.read)
+                .map(|(i, _)| i)
+                .collect();
+            if targets.is_empty() {
+                ctx.notice(me, from.uid, if only_new { "You have no new memos." } else { "You have no memos." });
+                return;
+            }
+            for i in targets {
+                if let Some(m) = db.memo_read(account, i) {
+                    show(me, from, i, &m, ctx);
+                }
+            }
+        }
+        Some(numstr) => {
+            let Some(n) = numstr.parse::<usize>().ok().filter(|n| *n >= 1) else {
+                ctx.notice(me, from.uid, "Syntax: READ <num>|NEW|ALL");
+                return;
+            };
+            match db.memo_read(account, n - 1) {
+                Some(m) => show(me, from, n - 1, &m, ctx),
+                None => ctx.notice(me, from.uid, format!("You have no memo #\x02{n}\x02.")),
+            }
+        }
+        None => ctx.notice(me, from.uid, "Syntax: READ <num>|NEW|ALL"),
+    }
+}
+
+fn show(me: &str, from: &Sender, index: usize, m: &MemoView, ctx: &mut ServiceCtx) {
+    ctx.notice(me, from.uid, format!("Memo #\x02{}\x02 from \x02{}\x02 ({}):", index + 1, m.from, human_time(m.ts)));
+    ctx.notice(me, from.uid, format!("  {}", m.text));
+}

modules/memoserv/src/send.rs

@@ -0,0 +1,26 @@
+use fedserv_api::{Sender, ServiceCtx, Store};
+
+// A full mailbox rejects new memos, so nobody can be flooded.
+const MAX_MEMOS: usize = 30;
+
+// SEND <nick> <text>: leave a memo on a registered account's mailbox.
+pub fn handle(me: &str, from: &Sender, account: &str, args: &[&str], ctx: &mut ServiceCtx, db: &mut dyn Store) {
+    if args.len() < 3 {
+        ctx.notice(me, from.uid, "Syntax: SEND <nick> <text>");
+        return;
+    }
+    let target = args[1];
+    let text = args[2..].join(" ");
+    let Some(dest) = db.resolve_account(target).map(str::to_string) else {
+        ctx.notice(me, from.uid, format!("\x02{target}\x02 isn't registered."));
+        return;
+    };
+    if db.memo_list(&dest).len() >= MAX_MEMOS {
+        ctx.notice(me, from.uid, format!("\x02{target}\x02's mailbox is full — they'll need to clear some memos first."));
+        return;
+    }
+    match db.memo_send(&dest, account, &text) {
+        Ok(()) => ctx.notice(me, from.uid, format!("Memo sent to \x02{target}\x02.")),
+        Err(_) => ctx.notice(me, from.uid, "Sorry, that didn't work. Please try again in a moment."),
+    }
+}