port(smarm): track HEAD efbc254 — RFC 014/015 API sync

- gen_server rename (RFC 015, 3e31606): ServerRef/ServerCtx/ServerBuilder
  -> GenServerRef/GenServerCtx/GenServerBuilder across conn_actor,
  conn_registry, serve, pubsub, channels::session.
- type Timer = () on the three GenServer impls (RFC 015, 57eadb5);
  handle_timer/handle_idle/tick_every stay defaulted — opt-in later.
- Watcher and GenServerCtx are now generic over the server type: watcher
  fields typed Watcher<Table<M>> / Watcher<Registry<P, K>>; Registry's
  struct bounds strengthened to its GenServer impl bounds
  (P: Encode + Decode + Send + Sync + 'static, K: SessionKey) so the
  Watcher field's G: GenServer bound is satisfiable at the declaration.
- RFC 014 (a866e34) registry: register is (Name<M>, Sender<M>), self-only
  — a name is a typed messaging endpoint, not a pid tag. The
  introspection-only urus.server / urus.listener.{i} bindings are dropped
  rather than faked with unit channels; the whereis integration test is
  deleted; a proper messageable-name design is icebox'd in ROADMAP.md.
- Audit vs smarm 6c2b7e9 (queued messages dropped when Receiver drops):
  pubsub's prune-on-send-failure retain still holds — send Errs once
  receiver_alive is false, so a dropped rx prunes on next broadcast,
  exactly what subscriber_count's doc already promised. Freeing stranded
  Arc<M> broadcasts is strictly good. No change needed.
- The 7x E0283 in channels/mod.rs were cascade fallout of the generics
  changes; dissolved with the port, as discovery predicted.

Suite: 90 lib + 45 integration + 2 doc, green under default, smarm-trace,
phoenix, and all-features. 3 pre-existing clippy lints (conn.rs,
parser.rs, conn_actor.rs; clippy 1.97 strictness) deferred to a follow-up
chore commit to keep this diff pure.

ROADMAP.md

@@ -378,3 +378,9 @@ reconnect cycles.
 - **Bench suite** — `urus-bench-spec.md` exists in the artefact store;
   wire it up once v0.2 lands (supervision changes the hot path not at all,
   but prove it).
+- **Operator introspection via typed names** — the v0.2-era
+  `urus.server` / `urus.listener.{i}` pid tags were dropped in the
+  RFC 014 port (names are messageable endpoints now, self-registered
+  with a real `Sender<M>`). If wanted back, do it properly: register the
+  serve loop's shutdown/control channel under a typed `urus.server`
+  name instead of faking pid tags with unit channels.

src/channels/session.rs

@@ -48,8 +48,8 @@
 
 use super::*;
 
-use smarm::gen_server::{self, GenServer, ServerCtx};
-use smarm::{Down, ServerRef, Watcher};
+use smarm::gen_server::{self, GenServer, GenServerCtx};
+use smarm::{Down, GenServerRef, Watcher};
 
 use std::collections::VecDeque;
 use std::hash::Hash;
@@ -87,7 +87,7 @@ pub trait ChannelSession<P>: Send + 'static {
 pub(super) struct SessionFactory<P: Encode + Decode + Send + Sync + 'static, K: SessionKey> {
     inner: Arc<dyn ChannelFactory<P>>,
     keyfn: fn(&str, &P) -> K,
-    registry: ServerRef<Registry<P, K>>,
+    registry: GenServerRef<Registry<P, K>>,
 }
 
 /// The registry's working bounds for a session key.
@@ -140,14 +140,14 @@ pub(super) struct Join<P: Send + Sync + 'static, K> {
     inbound: Receiver<In<P>>,
 }
 
-struct Registry<P: Send + Sync + 'static, K> {
+struct Registry<P: Encode + Decode + Send + Sync + 'static, K: SessionKey> {
     factory: Arc<dyn ChannelFactory<P>>,
     cap: usize,
     ttl: Duration,
     sessions: HashMap<K, (Pid, Sender<Ctl<P>>)>,
     /// Reverse index for `handle_down` — the reason `Key: Clone`.
     pid_key: HashMap<Pid, K>,
-    watcher: Option<Watcher>,
+    watcher: Option<Watcher<Registry<P, K>>>,
 }
 
 impl<P: Encode + Decode + Send + Sync + 'static, K: SessionKey> GenServer for Registry<P, K> {
@@ -155,8 +155,9 @@ impl<P: Encode + Decode + Send + Sync + 'static, K: SessionKey> GenServer for Re
     type Reply = ();
     type Cast = Join<P, K>;
     type Info = ();
+    type Timer = ();
 
-    fn init(&mut self, ctx: &ServerCtx) {
+    fn init(&mut self, ctx: &GenServerCtx<Self>) {
         self.watcher = Some(ctx.watcher());
     }
 

src/conn_actor.rs

@@ -19,7 +19,7 @@ use crate::net::OwnedFd;
 use crate::parser::{self, ParseError};
 use crate::plug::Pipeline;
 
-use smarm::ServerRef;
+use smarm::GenServerRef;
 
 use std::io::{self, ErrorKind};
 use std::os::fd::RawFd;
@@ -92,7 +92,7 @@ pub fn run_connection(
     fd: OwnedFd,
     pipeline: Pipeline,
     limits: ConnLimits,
-    registry: ServerRef<ConnRegistry>,
+    registry: GenServerRef<ConnRegistry>,
 ) {
     // The OwnedFd cleans up via Drop on any exit path (panic, error, or
     // normal close). No explicit close calls below.

src/conn_registry.rs

@@ -33,7 +33,7 @@
 //! (roadmap v0.4+), which is why it exists as its own module rather than
 //! being inlined into `serve`.
 
-use smarm::{GenServer, Pid, ServerBuilder, ServerRef};
+use smarm::{GenServer, Pid, GenServerBuilder, GenServerRef};
 
 use std::collections::HashMap;
 
@@ -86,6 +86,7 @@ impl GenServer for ConnRegistry {
     type Reply = Reply;
     type Cast  = Cast;
     type Info  = ();
+    type Timer = ();
 
     fn handle_call(&mut self, request: Call) -> Reply {
         match request {
@@ -137,8 +138,8 @@ impl GenServer for ConnRegistry {
     }
 }
 
-pub fn start() -> ServerRef<ConnRegistry> {
-    ServerBuilder::new(ConnRegistry::default()).start()
+pub fn start() -> GenServerRef<ConnRegistry> {
+    GenServerBuilder::new(ConnRegistry::default()).start()
 }
 
 // ---------------------------------------------------------------------------
@@ -149,13 +150,13 @@ pub fn start() -> ServerRef<ConnRegistry> {
 /// unwind, and panic unwind alike; the cast is infallible from the
 /// guard's perspective (a dead registry just returns an ignored Err).
 pub struct DeregisterGuard {
-    registry: ServerRef<ConnRegistry>,
+    registry: GenServerRef<ConnRegistry>,
     pid:      Pid,
     make:     fn(Pid) -> Cast,
 }
 
 impl DeregisterGuard {
-    pub fn new(registry: ServerRef<ConnRegistry>, pid: Pid, make: fn(Pid) -> Cast) -> Self {
+    pub fn new(registry: GenServerRef<ConnRegistry>, pid: Pid, make: fn(Pid) -> Cast) -> Self {
         Self { registry, pid, make }
     }
 }

src/pubsub.rs

@@ -58,7 +58,7 @@
 //! # Why there is no `register(name)` helper (yet)
 //!
 //! smarm's registry maps `name → Pid`, but a `Pid` cannot be turned back
-//! into a `ServerRef` (the ref *is* the inbox sender). A useful named
+//! into a `GenServerRef` (the ref *is* the inbox sender). A useful named
 //! lookup therefore needs either smarm support (registry-held senders)
 //! or a process-global type-erased map here — both against the grain of
 //! the ratified design. Deferred; pass the handle.
@@ -67,8 +67,8 @@ use std::collections::{HashMap, HashSet};
 use std::fmt;
 use std::sync::Arc;
 
-use smarm::gen_server::{self, GenServer, ServerCtx};
-use smarm::{channel, Down, Pid, Receiver, Sender, ServerRef, Watcher};
+use smarm::gen_server::{self, GenServer, GenServerCtx};
+use smarm::{channel, Down, Pid, Receiver, Sender, GenServerRef, Watcher};
 
 // ---------------------------------------------------------------------------
 // Public handle
@@ -92,7 +92,7 @@ impl std::error::Error for PubSubDown {}
 /// Payloads are broadcast as `Arc<M>`: one allocation per broadcast, not
 /// per subscriber.
 pub struct PubSub<M: Send + Sync + 'static> {
-    server: ServerRef<Table<M>>,
+    server: GenServerRef<Table<M>>,
 }
 
 impl<M: Send + Sync + 'static> Clone for PubSub<M> {
@@ -226,7 +226,7 @@ struct Table<M: Send + Sync + 'static> {
     /// retires the entry so a reused-slot pid (fresh generation) gets a
     /// fresh monitor.
     monitored: HashSet<Pid>,
-    watcher: Option<Watcher>,
+    watcher: Option<Watcher<Table<M>>>,
 }
 
 impl<M: Send + Sync + 'static> Table<M> {
@@ -240,8 +240,9 @@ impl<M: Send + Sync + 'static> GenServer for Table<M> {
     type Reply = Reply;
     type Cast = Cast<M>;
     type Info = ();
+    type Timer = ();
 
-    fn init(&mut self, ctx: &ServerCtx) {
+    fn init(&mut self, ctx: &GenServerCtx<Self>) {
         self.watcher = Some(ctx.watcher());
     }
 

src/serve.rs

@@ -17,7 +17,7 @@ use crate::conn_registry::{self, Call, Cast, ConnRegistry, Reply};
 use crate::net::{accept_nonblocking, bind_and_listen, OwnedFd};
 use crate::plug::Pipeline;
 
-use smarm::{ChildSpec, OneForOne, Restart, ServerRef, Strategy};
+use smarm::{ChildSpec, OneForOne, Restart, GenServerRef, Strategy};
 
 use std::io::{self, ErrorKind};
 use std::net::{SocketAddr, ToSocketAddrs};
@@ -125,7 +125,7 @@ fn listener_loop(
     listener: Arc<OwnedFd>,
     pipeline: Pipeline,
     limits: ConnLimits,
-    registry: ServerRef<ConnRegistry>,
+    registry: GenServerRef<ConnRegistry>,
     shutdown: Arc<AtomicBool>,
 ) {
     let fd = listener.as_raw();
@@ -327,15 +327,6 @@ pub fn serve_with_shutdown(
             let sf = shutdown_flag.clone();
             sup = sup.child(ChildSpec::new(Restart::Transient, move || {
                 println!("urus: listener {} starting", i);
-                // Named for whereis-style introspection. On a restart the
-                // old binding points at a dead pid; smarm's registry
-                // evicts stale bindings lazily, so re-registering the
-                // same name is fine. Ignore the result — a registry
-                // hiccup must not take the listener down.
-                let _ = smarm::register(
-                    format!("urus.listener.{i}"),
-                    smarm::self_pid(),
-                );
                 listener_loop(lfd.clone(), p.clone(), limits, r.clone(), sf.clone());
             }));
         }
@@ -343,11 +334,13 @@ pub fn serve_with_shutdown(
         // faster than that trips the cap and tears the pool down — loud
         // failure over a zombie server.
         let sup_h = smarm::spawn(move || sup.run());
-        // Register via the JoinHandle's pid rather than inside the
-        // closure: the binding exists before the supervisor body runs a
-        // single instruction, so an early `whereis("urus.server")` can't
-        // race a None. Result ignored for the same reason as listeners.
-        let _ = smarm::register("urus.server", sup_h.pid());
+        // The old `urus.server` / `urus.listener.{i}` name registrations
+        // are gone with smarm's RFC 014 registry rework: `register` is now
+        // `(Name<M>, Sender<M>)`, self-only — a name is a typed messaging
+        // endpoint, not a pid tag. urus's bindings were introspection-only
+        // with no channel behind them, so they were dropped rather than
+        // faked with a unit channel. A real messageable `urus.server`
+        // name is in the icebox (ROADMAP.md).
 
         // Block until told to shut down. We poll `try_recv` + `sleep`
         // rather than parking in `recv`: a smarm `Sender::send` from a
@@ -399,7 +392,7 @@ pub fn serve_with_shutdown(
             }
         }
 
-        // 5. Our ServerRef drops here. The registry's inbox closes once
+        // 5. Our GenServerRef drops here. The registry's inbox closes once
         //    the last conn's clone drops with it, and the runtime winds
         //    down when the last actor exits.
     });

tests/integration.rs

@@ -89,24 +89,9 @@ fn hello_world() {
     assert_eq!(http_body(&resp), b"hello urus");
 }
 
-#[test]
-fn server_and_listeners_are_registered() {
-    // `whereis` must run inside the runtime (the test itself is a foreign
-    // OS thread with no runtime in its TLS), so probe from a handler —
-    // connection actors live in the runtime by construction.
-    let pipe = Pipeline::new().plug(
-        Router::new().get("/whereis", |c: Conn, _n: Next| {
-            let ok = smarm::whereis("urus.server").is_some()
-                && smarm::whereis("urus.listener.0").is_some()
-                && smarm::whereis("urus.listener.1").is_some(); // pool of 2
-            c.put_status(200).put_body(if ok { "registered" } else { "missing" })
-        })
-    );
-    let port = spawn_server(pipe);
-    let resp = send_request(port, b"GET /whereis HTTP/1.1\r\nHost: x\r\nConnection: close\r\n\r\n");
-    assert_eq!(http_status(&resp), 200);
-    assert_eq!(http_body(&resp), b"registered");
-}
+// `server_and_listeners_are_registered` was deleted with the RFC 014 port:
+// urus no longer binds `urus.server` / `urus.listener.{i}` names (see the
+// note in serve.rs and the icebox entry in ROADMAP.md).
 
 #[test]
 fn echo_body() {