(new): PollTimeout config, RateLimiter.Cleanup

(fix): compact payload escape, Draft.push validation, plugin logger ownership, worker StopAndWait, getChatLimiter deadlock, runner ctx-after-tick
(refactor): remove NewPayload, buildSceneKey from sceneRuntime, unify ToJSON fallback
(tests): compact round-trip, Draft.push state, RateLimiter.Cleanup eviction
(doc): changelog v1.0.0 rewrite, NewCommand dual-use godoc

scene_context.go

@@ -1,8 +1,8 @@
 package laniakea
 
-// SceneContext wraps MsgContext with scene session state for scene handlers.
+// SceneContext wraps MessageContext with scene session state for scene handlers.
 type SceneContext struct {
-	*MsgContext
+	*MessageContext
 	sess SceneSession
 	key  string
 }