runtime: wake_slot default ON (RFC 005 accepted, finding 18); supervisor stops survivors sequentially so reverse-order teardown is guaranteed; deflake gen_server/channel tests; baseline.json regenerated slot-on; ROADMAP notes

src/runtime.rs

@@ -182,7 +182,7 @@ impl Config {
             stack_reserve: DEFAULT_STACK_RESERVE,
             stack_guard: DEFAULT_STACK_GUARD,
             max_actors: DEFAULT_MAX_ACTORS,
-            wake_slot: false,
+            wake_slot: true,
             node_id: crate::pg::DEFAULT_NODE_ID,
             incarnation: crate::pg::DEFAULT_INCARNATION,
         }
@@ -205,7 +205,7 @@ impl Config {
             stack_reserve: DEFAULT_STACK_RESERVE,
             stack_guard: DEFAULT_STACK_GUARD,
             max_actors: DEFAULT_MAX_ACTORS,
-            wake_slot: false,
+            wake_slot: true,
             node_id: crate::pg::DEFAULT_NODE_ID,
             incarnation: crate::pg::DEFAULT_INCARNATION,
         }
@@ -283,7 +283,7 @@ impl Config {
     /// thread's slot; it is resumed next on that core and inherits the
     /// remainder of the waker's timeslice. Scheduler-context wakes
     /// (timer/IO drain) and spawns always go to the shared queue.
-    /// Default: `false` (off until the slot shootout accepts it).
+    /// Default: `true` (accepted 2026-08-18, history.md finding 17/18).
     pub fn wake_slot(mut self, on: bool) -> Self {
         self.wake_slot = on;
         self
@@ -333,7 +333,7 @@ impl Default for Config {
             stack_reserve: DEFAULT_STACK_RESERVE,
             stack_guard: DEFAULT_STACK_GUARD,
             max_actors: DEFAULT_MAX_ACTORS,
-            wake_slot: false,
+            wake_slot: true,
             node_id: crate::pg::DEFAULT_NODE_ID,
             incarnation: crate::pg::DEFAULT_INCARNATION,
         }