node: establish dataplane/ and session/ concept homes (behavior-neutral)

Reorganize the node module tree by concept rather than by
message-handling verb, as the first step of the node runtime
decomposition. Pure relocation: no wire, config, metric, or log
semantics change; the lib test count is unchanged (1577 passed).

Moves (git mv, 100% rename similarity):
- handlers/{forwarding,rx_loop,connected_udp,dispatch,encrypted}.rs
  -> node/dataplane/ — the whole RX hot path (the select! run loop,
  transit/local forwarding, the link-message router, the RX decrypt
  path with responder K-bit cutover + roam writes, and connected-UDP
  fast-path activation) now lives in one home.
- node/session.rs -> node/session/mod.rs — establishes the session
  concept home for the data/state types. The message-behavior file
  handlers/session.rs stays put for now (folds in with the later FSP
  session step).

The IK/XX-divergent establishment files (handlers/{handshake,rekey,
timeout}.rs) and the deferred-home files (handlers/{mmp,lookup}.rs)
deliberately stay in handlers/, to move once rather than twice.

Every module is reached through impl Node methods, so no call site or
re-export shim was needed. Updated in lockstep with the moves: the
module_path!-derived tracing targets in the two mesh-lab compose-trace
overlays, a structural test's include_str! source path, doc-comments
in proto/routing and the mesh-lab docs, and the stale source-location
citations (node/handlers/{forwarding,rx_loop,encrypted}.rs and
node/session.rs) in doc-comments and the discovery design doc.

src/control/queries.rs

@@ -2767,12 +2767,12 @@ mod tests {
     /// Structural confirmation that the rx_loop no longer dispatches `show_*`:
     /// the rx_loop source carries no `queries::dispatch` call and no
     /// `starts_with("show_")` routing branch. Reads the committed source of
-    /// `src/node/handlers/rx_loop.rs` and asserts both markers are absent. This
+    /// `src/node/dataplane/rx_loop.rs` and asserts both markers are absent. This
     /// is the milestone's "remove `show_*` from the data-plane dispatch path"
     /// invariant, guarded against regression.
     #[test]
     fn rx_loop_has_no_show_dispatch() {
-        let src = include_str!("../node/handlers/rx_loop.rs");
+        let src = include_str!("../node/dataplane/rx_loop.rs");
         assert!(
             !src.contains("queries::dispatch"),
             "rx_loop must not call queries::dispatch (show_* served off-loop)"

src/node/dataplane/mod.rs

@@ -0,0 +1,15 @@
+//! Data plane: the RX `select!` loop and the per-packet forwarding path.
+//!
+//! Holds the whole hot path in one home: the `select!` run loop
+//! (`rx_loop`), transit/local datagram forwarding (`forwarding`), the
+//! link-message router (`dispatch`), the RX decrypt path including responder
+//! K-bit cutover and address-roam writes (`encrypted`), and the per-peer
+//! connected-UDP fast-path socket activation (`connected_udp`). Each module
+//! contributes `impl Node` methods driven by the run loop.
+
+#[cfg(unix)]
+pub(crate) mod connected_udp;
+mod dispatch;
+mod encrypted;
+mod forwarding;
+mod rx_loop;

src/node/handlers/mod.rs

@@ -1,14 +1,8 @@
-//! RX event loop and message handlers.
+//! Message handlers: per-message-type behavior on `impl Node`.
 
-#[cfg(unix)]
-pub(crate) mod connected_udp;
-mod dispatch;
-mod encrypted;
-mod forwarding;
 mod handshake;
 pub(crate) mod lookup;
 mod mmp;
 mod rekey;
-mod rx_loop;
 pub(in crate::node) mod session;
 mod timeout;

src/node/mod.rs

@@ -7,6 +7,7 @@
 pub(crate) mod acl;
 mod bloom;
 pub(crate) mod context;
+mod dataplane;
 #[cfg(unix)]
 pub(crate) mod decrypt_worker;
 #[cfg(unix)]

src/node/reject.rs

@@ -222,7 +222,7 @@ pub enum MmpReject {
 /// Forwarding-path rejection reasons.
 ///
 /// Each variant corresponds to a silent-rejection path in
-/// `src/node/handlers/forwarding.rs::handle_session_datagram`. Matching
+/// `src/node/dataplane/forwarding.rs::handle_session_datagram`. Matching
 /// `ForwardingStats` counters already track packets and bytes for each
 /// outcome; `record_reject` mirrors the packet-count side of the bump
 /// for parity with the other rejection clusters.

src/node/tests/decrypt_failure.rs

@@ -1,6 +1,6 @@
 //! Tests for the consecutive-decrypt-failure threshold force-removal path.
 //!
-//! Covers `Node::handle_decrypt_failure` (in `node/handlers/encrypted.rs`),
+//! Covers `Node::handle_decrypt_failure` (in `node/dataplane/encrypted.rs`),
 //! which increments `ActivePeer::increment_decrypt_failures` on each AEAD
 //! verification failure and force-removes the peer once
 //! `DECRYPT_FAILURE_THRESHOLD` consecutive failures are observed. The
@@ -18,7 +18,7 @@ use super::*;
 /// the full `peers_by_index` cleanup path (not just the bare `peers` table).
 #[test]
 fn test_decrypt_failure_threshold_removes_peer() {
-    // Threshold constant in node/handlers/encrypted.rs (kept in sync with
+    // Threshold constant in node/dataplane/encrypted.rs (kept in sync with
     // production code; see DECRYPT_FAILURE_THRESHOLD).
     const THRESHOLD: u32 = 20;
 

src/node/tests/handshake.rs

@@ -1072,7 +1072,7 @@ async fn test_should_admit_msg1_admits_rekey_when_udp_accept_off() {
 ///
 /// The carve-out predicate must also consult peer state by source
 /// address: `current_addr()` is updated from inbound encrypted-frame
-/// source addrs (`handlers/encrypted.rs`), so an established peer can
+/// source addrs (`dataplane/encrypted.rs`), so an established peer can
 /// be matched even when the addr_to_link key is hostname-form and the
 /// incoming addr is numeric.
 #[tokio::test]

src/peer/active.rs

@@ -1529,7 +1529,7 @@ mod tests {
     // === FMP rekey cutover: authenticate-before-promote ===
     //
     // IK-adapted analogue of the FSP trial-decrypt tests
-    // (node/session.rs `trial_decrypt_picks_pending_and_promotes` /
+    // (node/session/mod.rs `trial_decrypt_picks_pending_and_promotes` /
     // `trial_decrypt_failed_slot_leaves_replay_window_intact`). The FMP
     // cutover is gated on an authenticated decrypt against `pending`, not
     // the bare header K-bit. These tests exercise that primitive:

src/proto/routing/core.rs

@@ -1,7 +1,7 @@
 //! Sans-IO routing decision core.
 //!
 //! Pure, runtime-agnostic transit-forward decision for SessionDatagrams. The
-//! async I/O adapter in `node::handlers::forwarding` decodes the wire bytes,
+//! async I/O adapter in `node::dataplane::forwarding` decodes the wire bytes,
 //! pre-resolves the next hop, builds a [`RoutingView`] over live node state,
 //! calls [`Router::route`], and drives the returned [`RouteOutcome`] (the
 //! actual encrypted sends, metrics, and logging). No I/O, no clock, no

src/proto/routing/mod.rs

@@ -2,7 +2,7 @@
 //!
 //! Pure, runtime-agnostic routing state and decision core, migrated out of
 //! the async node shell. The async I/O handlers remain in
-//! `node::handlers::forwarding`.
+//! `node::dataplane::forwarding`.
 //!
 //! - `core.rs` — the `RoutingView` read-seam trait, the `NextHop` /
 //!   `RouteOutcome` types, `Router::route`, the pure transit-forward