mailbox: Phase 2 — registry resolves name/pid to a messageable actor (RFC 014)

Rip out the old name<->pid bimap; rebuild registry.rs as the live mailbox
directory. A name resolves to a SINGLE actor (many-per-label is pg's job); that
actor owns a SET of typed channels (channels are typed, so no single mailbox),
keyed by message TypeId. Resolution: name -> pid (one actor) -> Mailbox ->
channel for type M. Same name + different type parameter selects different
channels of the one actor, so capability separation (§4.7) needs no new type.

- register<M>(Name<M>, Sender<M>): captures the current actor's channel under a
  name (one step, per decision). Adds channels cumulatively; NameTaken only vs a
  different LIVE holder; stale/dangling bindings pruned on contact.
- send<M>(Name<M>, msg): the payoff — resolve, clone the Sender UNDER the Leaf
  lock, release, then send (Leaf -> Channel; a send can unpark). Returns the msg
  on Unresolved / NoChannel / Closed.
- whereis -> single live pid; unregister frees only the name (mailbox/other
  names survive). name_of (reverse lookup) dropped — deferred to introspection.
- Contained erasure: each channel is Box<dyn Any+Send> filed under TypeId::of M
  and downcast to its own keying type, so the downcast can't fail on good data
  (debug-asserted via the stored type_name). Phantom M on Name re-imposes type.
- One Leaf RawMutex (the fold), so a name send stays on a single Leaf — two
  Leaves at once is a hard panic. runtime.rs field/init unchanged (same Registry
  name + new()).

tests/registry.rs rewritten for the new semantics: send-by-name delivery,
many typed channels on one actor, same-name/different-type routing, NameTaken,
takeover across slot reuse, Unresolved/NoChannel. Also fold in a Phase 1 fixup:
the phantom test key was an enum whose variants tripped dead-code under the test
build (only caught now that I run -D warnings on --tests). Full suite +
order-checker green, warning-free across all targets.

src/lib.rs

@@ -56,7 +56,7 @@ pub use monitor::{demonitor, monitor, Down, DownReason, Monitor, MonitorId};
 pub use mutex::{LockTimeout, Mutex, MutexGuard};
 pub use pid::{Addr, Addressable, Name, Pid};
 pub use pg::{join, leave, members, pick, Incarnation, Member, NodeId};
-pub use registry::{name_of, register, unregister, whereis, RegisterError};
+pub use registry::{register, send, unregister, whereis, RegisterError, SendError};
 pub use runtime::{init, Config, Runtime};
 pub use scheduler::{
     block_on_io, request_stop, run, self_pid, sleep, spawn, spawn_under, wait_readable,