Release v1.0.0-rc.12

Finalize scenes, typed arg binding, and request-scoped context plumbing

Refresh docs, backlog state, and regression coverage for the rc.12 release

CHANGELOG.md

@@ -8,23 +8,19 @@
 - `Bot.GetPayloadType()`, `InlineKeyboard.GetPayloadType()`, and optional strict payload decoding via `BotOpts.StrictPayloadType` / `Bot.SetStrictPayloadType(...)`.
 - `MsgContext.BindArgs(...)` for binding positional command arguments into exported struct fields.
 - Binding sentinels `ErrBindArgsTargetNotPointer`, `ErrBindArgsTargetNotStruct`, `ErrBindArgsUnsupportedFieldType`, and `ErrBindArgsConversion`.
+- Work-in-progress scene/session support, including plugin scene registration, scoped scene sessions, scene entry/exit APIs on `MsgContext`, default in-memory session storage, scene-local routing before normal command handling, and state helpers on `SceneContext`.
 
 ### Changed
 - `CommandExecutor` now returns `error`, and command, payload, and non-command update handlers now use centralized bot error handling for returned errors.
 - README and README_RU examples now use the new handler signature and document the long-message helpers.
 - README and README_RU now link to the project wiki, and the wiki now includes a page-priority tracker while content is being filled in.
-- `AGENTS.md` now requires every change to be recorded in `CHANGELOG.md`, enforces version alignment with `utils/version.go`, and blocks breaking changes without a major-version bump.
-- `AGENTS.md` now also defines a short commit-message format: one summary line plus up to three high-signal detail lines.
-- `AGENTS.md` now explicitly requires each commit-message detail line to be placed on its own new line.
-- `AGENTS.md` now also requires commit messages to be emitted as a plain multiline block instead of collapsed prose or list formatting.
-- `AGENTS.md` now requires new or expanded project documentation to be maintained in both English and Russian whenever reasonably possible.
-- `AGENTS.md` now requires all agent-created commits to be GPG-signed and to fail fast instead of falling back to unsigned commits when signing cannot be completed.
-- `AGENTS.md` now also links the wiki backlog flow more tightly to `TODO.md` and `CHANGELOG.md`, requiring draft-wiki confirmation for large new ideas and synchronized completion records for backlog items.
-- Added `TODO.md` to track missing framework-level concepts, with detailed notes for scenes, typed handler input, and request-scoped cancellation.
+- README and README_RU now document scenes, session scopes, scene state helpers, and `SceneActionPass` semantics.
+- `TODO.md` and the framework backlog pages now group the remaining framework work into explicit priority 1, 2, and 3 buckets.
 - Payload-type comments and docs now distinguish between the bot's default payload type and keyboard-local overrides.
+- Scene runtime sentinel errors now have explicit godoc comments.
+- Public scene structs now document their exported fields more explicitly.
 - `MsgContext.Context()` now safely falls back to `context.Background()` when no request-scoped context is attached.
 - `MsgContext` reply, edit, callback, delete, action, and draft-limiter paths now use the context accessor instead of reaching into raw internal state.
-- `TODO.md` is now a short pointer file, while the detailed framework backlog lives in the wiki as `Framework-Backlog` / `Framework-Backlog-RU`.
 - Version constants were bumped to `v1.0.0-rc.12`.
 
 ### Fixed
@@ -41,6 +37,8 @@
 
 ### Tests
 - Added regression tests for `MsgContext.BindArgs(...)`, including scalar conversion, tail-string binding, zero-value trailing fields, invalid targets, unsupported field types, and end-to-end command/payload binding.
+- Added scene regression tests for runtime guards, scene-local command handling, and `SceneActionPass` preserving session state.
+- Added scene regression tests for message fallback handling, user-scoped session lookup without `Msg`, and custom `SessionStore` error propagation.
 
 ## v1.0.0-rc.11
 

README.md

@@ -4,13 +4,13 @@
 
 [![Go Version](https://img.shields.io/badge/Go-1.24+-00ADD8?logo=go&style=flat-square)](https://go.dev/)
 [![License: GPL-3.0](https://img.shields.io/badge/License-GPL%203.0-blue.svg?style=flat-square)](LICENSE)
-![Gitea Release](https://img.shields.io/gitea/v/release/ScuroNeko/Laniakea?gitea_url=https%3A%2F%2Fgit.nix13.pw&sort=semver&display_name=release&style=flat-square&color=purple&link=https%3A%2F%2Fgit.nix13.pw%2FScuroNeko%2FLaniakea%2Freleases)
+![Gitea Release](https://img.shields.io/gitea/v/release/ScuroNeko/Laniakea?gitea_url=https%3A%2F%2Fgit.scuroneko.dev&sort=semver&display_name=release&style=flat-square&color=purple&link=https%3A%2F%2Fgit.scuroneko.dev%2FScuroNeko%2FLaniakea%2Freleases)
 
 A lightweight, easy-to-use, and performant Telegram Bot API wrapper for Go. It simplifies bot development with a clean plugin system, middleware support, automatic command generation, and built-in rate limiting.
 
 [На русском](README_RU.md)
 
-[Wiki](https://git.nix13.pw/ScuroNeko/Laniakea/wiki)
+[Wiki](https://git.scuroneko.dev/ScuroNeko/Laniakea/wiki)
 
 ---
 
@@ -29,7 +29,7 @@ A lightweight, easy-to-use, and performant Telegram Bot API wrapper for Go. It s
 ## 📦 Installation
 
 ```bash
-go get git.nix13.pw/scuroneko/laniakea
+go get git.scuroneko.dev/scuroneko/laniakea
 ```
 
 or
@@ -47,7 +47,7 @@ package main
 import (
 	"log"
 
-	"git.nix13.pw/scuroneko/laniakea" // Import the Laniakea library
+	"git.scuroneko.dev/scuroneko/laniakea" // Import the Laniakea library
 )
 
 // echo is a command handler function.
@@ -182,6 +182,43 @@ if err != nil {
 bot.DatabaseContext(db)
 ```
 
+### Scenes and Sessions
+
+Scenes model multi-step conversations inside a plugin. Each active scene is stored in a session keyed by scope, so you can isolate flows per user, per chat, or per user-chat pair.
+
+```go
+plugin := laniakea.NewPlugin[MyDB]("signup")
+
+plugin.NewScene("signup").
+    SetScope(laniakea.SceneScopeUserChat).
+    SetEntry("ask_name").
+    OnStep("ask_name", func(ctx *laniakea.SceneContext, db MyDB) (laniakea.SceneResult, error) {
+        if ctx.Text == "" {
+            ctx.Answer("What is your name?")
+            return ctx.Stay(), nil
+        }
+
+        if err := ctx.SaveData(struct {
+            Name string `json:"name"`
+        }{Name: ctx.Text}); err != nil {
+            return laniakea.SceneResult{}, err
+        }
+
+        ctx.Answer("Nice to meet you.")
+        return ctx.Next("done"), nil
+    }).
+    OnStep("done", func(ctx *laniakea.SceneContext, db MyDB) (laniakea.SceneResult, error) {
+        return ctx.Exit(), nil
+    })
+```
+
+- Use `ctx.EnterScene("signup")` to enter the configured entry step.
+- Use `ctx.EnterSceneStep("signup", "done")` when you need an explicit starting step.
+- Return `ctx.Stay()`, `ctx.Next(step)`, `ctx.Exit()`, or `ctx.Pass()` from scene handlers to control flow.
+- `SceneActionPass` keeps the current session unchanged and continues normal bot routing.
+- Use `SceneContext.SaveData(...)` and `SceneContext.BindData(...)` for JSON session state.
+- Use `SceneScopeUser`, `SceneScopeChat`, or `SceneScopeUserChat` depending on how widely a conversation should be shared.
+
 ## 🧩 Middleware
 Middleware are functions that run before a command handler. They are perfect for cross-cutting concerns like logging, access control, rate limiting, or modifying the context.
 
@@ -247,9 +284,9 @@ func adminOnlyMiddleware(ctx *laniakea.MsgContext, db *MyDB) bool {
 This project is licensed under the GNU General Public License v3.0 — see the [LICENSE](LICENSE) file for details.
 
 ## 📚 Learn More
-[GoDoc](https://pkg.go.dev/git.nix13.pw/scuroneko/laniakea)
+[GoDoc](https://pkg.go.dev/git.scuroneko.dev/scuroneko/laniakea)
 
-[Wiki](https://git.nix13.pw/ScuroNeko/Laniakea/wiki)
+[Wiki](https://git.scuroneko.dev/ScuroNeko/Laniakea/wiki)
 
 [Telegram Bot API](https://core.telegram.org/bots/api)
 

README_RU.md

@@ -4,13 +4,13 @@
 
 [![Go Version](https://img.shields.io/badge/Go-1.24+-00ADD8?logo=go&style=flat-square)](https://go.dev/)
 [![License: GPL-3.0](https://img.shields.io/badge/License-GPL%203.0-blue.svg?style=flat-square)](LICENSE)
-![Gitea Release](https://img.shields.io/gitea/v/release/ScuroNeko/Laniakea?gitea_url=https%3A%2F%2Fgit.nix13.pw&sort=semver&display_name=release&style=flat-square&color=purple&link=https%3A%2F%2Fgit.nix13.pw%2FScuroNeko%2FLaniakea%2Freleases)
+![Gitea Release](https://img.shields.io/gitea/v/release/ScuroNeko/Laniakea?gitea_url=https%3A%2F%2Fgit.scuroneko.dev&sort=semver&display_name=release&style=flat-square&color=purple&link=https%3A%2F%2Fgit.scuroneko.dev%2FScuroNeko%2FLaniakea%2Freleases)
 
 Легковесная, простая в использовании и производительная обёртка для Telegram Bot API на Go. Она упрощает разработку ботов благодаря чистой системе плагинов, поддержке Middleware, автоматической генерации команд и встроенному рейтлимитеру.
 
 [English](README.md)
 
-[Wiki](https://git.nix13.pw/ScuroNeko/Laniakea/wiki)
+[Wiki](https://git.scuroneko.dev/ScuroNeko/Laniakea/wiki)
 
 ---
 
@@ -30,7 +30,7 @@
 ## 📦 Установка
 
 ```bash
-go get git.nix13.pw/scuroneko/laniakea
+go get git.scuroneko.dev/scuroneko/laniakea
 ```
 
 или
@@ -48,7 +48,7 @@ package main
 import (
 	"log"
 
-	"git.nix13.pw/scuroneko/laniakea" // Импортируем библиотеку Laniakea
+	"git.scuroneko.dev/scuroneko/laniakea" // Импортируем библиотеку Laniakea
 )
 
 // echo — это функция-обработчик команды.
@@ -170,6 +170,43 @@ if err != nil {
 bot.DatabaseContext(db)
 ```
 
+### Сцены и сессии (Scenes and Sessions)
+
+Сцены описывают многошаговые диалоги внутри плагина. Активная сцена хранится в session state, ключ которого зависит от scope, поэтому поток можно изолировать на пользователя, на чат или на пару пользователь-чат.
+
+```go
+plugin := laniakea.NewPlugin[MyDB]("signup")
+
+plugin.NewScene("signup").
+    SetScope(laniakea.SceneScopeUserChat).
+    SetEntry("ask_name").
+    OnStep("ask_name", func(ctx *laniakea.SceneContext, db MyDB) (laniakea.SceneResult, error) {
+        if ctx.Text == "" {
+            ctx.Answer("Как тебя зовут?")
+            return ctx.Stay(), nil
+        }
+
+        if err := ctx.SaveData(struct {
+            Name string `json:"name"`
+        }{Name: ctx.Text}); err != nil {
+            return laniakea.SceneResult{}, err
+        }
+
+        ctx.Answer("Приятно познакомиться.")
+        return ctx.Next("done"), nil
+    }).
+    OnStep("done", func(ctx *laniakea.SceneContext, db MyDB) (laniakea.SceneResult, error) {
+        return ctx.Exit(), nil
+    })
+```
+
+- Используйте `ctx.EnterScene("signup")`, чтобы войти в entry step, настроенный у сцены.
+- Используйте `ctx.EnterSceneStep("signup", "done")`, если нужен явный стартовый step.
+- Из scene handler возвращайте `ctx.Stay()`, `ctx.Next(step)`, `ctx.Exit()` или `ctx.Pass()` для управления потоком.
+- `SceneActionPass` не меняет текущую session state и продолжает обычный routing бота.
+- Для JSON-состояния сцены используйте `SceneContext.SaveData(...)` и `SceneContext.BindData(...)`.
+- Выбирайте `SceneScopeUser`, `SceneScopeChat` или `SceneScopeUserChat` в зависимости от того, насколько широко должен разделяться диалог.
+
 ### tgapi: API и Uploader
 
 В `tgapi` есть два клиента:
@@ -243,9 +280,9 @@ func adminOnlyMiddleware(ctx *laniakea.MsgContext, db *MyDB) bool {
 Этот проект лицензирован под GNU General Public License v3.0 - подробности см. в файле [LICENSE](LICENSE).
 
 ## 📚 Дополнительная информация
-[GoDoc Laniakea](https://pkg.go.dev/git.nix13.pw/scuroneko/laniakea)
+[GoDoc Laniakea](https://pkg.go.dev/git.scuroneko.dev/scuroneko/laniakea)
 
-[Wiki](https://git.nix13.pw/ScuroNeko/Laniakea/wiki)
+[Wiki](https://git.scuroneko.dev/ScuroNeko/Laniakea/wiki)
 
 [Telegram Bot API](https://core.telegram.org/bots/api)
 

TODO.md

@@ -4,14 +4,20 @@ The framework backlog has moved to the wiki.
 
 Primary page:
 
-- https://git.nix13.pw/ScuroNeko/Laniakea/wiki/Framework-Backlog
+- https://git.scuroneko.dev/ScuroNeko/Laniakea/wiki/Framework-Backlog
 
 Russian page:
 
-- https://git.nix13.pw/ScuroNeko/Laniakea/wiki/Framework-Backlog-RU
+- https://git.scuroneko.dev/ScuroNeko/Laniakea/wiki/Framework-Backlog-RU
 
-Current high-priority status:
+Current priority split:
 
-- `1. Conversation / Scene Model`: not implemented yet.
+- `Priority 1`: update schema contract, user-facing vs internal error model, configuration freeze model.
+- `Priority 2`: webhook runtime model, authorization and policy model, observability model.
+- `Priority 3`: service layer and dependency graph model, plugin composition contract.
+
+Completed former high-priority items:
+
+- `1. Conversation / Scene Model`: completed in `v1.0.0-rc.12`.
 - `2. Typed Handler Input Model`: completed in `v1.0.0-rc.12`.
 - `3. Request Context / Cancellation Model`: completed in `v1.0.0-rc.12`.

bot.go

@@ -12,10 +12,10 @@ import (
 	"sync"
 	"time"
 
-	"git.nix13.pw/scuroneko/extypes"
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/laniakea/utils"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/extypes"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/utils"
+	"git.scuroneko.dev/scuroneko/slog"
 	"github.com/alitto/pond/v2"
 )
 
@@ -342,21 +342,35 @@ func (bot *Bot[T]) SetDraftProvider(p *DraftProvider) *Bot[T] {
 	bot.draftProvider = p
 	return bot
 }
+
+// GetDraftProvider returns the draft provider currently used by the bot.
 func (bot *Bot[T]) GetDraftProvider() *DraftProvider {
 	return bot.draftProvider
 }
 
-func (bot *Bot[T]) SetSettionStore(store SessionStore) *Bot[T] {
+// SetSessionStore replaces the session store used for scene management.
+func (bot *Bot[T]) SetSessionStore(store SessionStore) *Bot[T] {
+	if store == nil {
+		bot.logger.Warn("SetSessionStore called with nil store; using default MemorySessionStore")
+		return bot
+	}
 	bot.sessionStore = store
 	return bot
 }
+
+// GetSessionStore returns the session store used for scene management.
 func (bot *Bot[T]) GetSessionStore() SessionStore {
 	return bot.sessionStore
 }
 
+// SetSceneScopePriority sets the lookup order for resolving active scene sessions.
 func (bot *Bot[T]) SetSceneScopePriority(priority []SceneScope) *Bot[T] {
 	newPriority := make([]SceneScope, 0, 3)
 	for _, scope := range priority {
+		if scope != SceneScopeUser && scope != SceneScopeChat && scope != SceneScopeUserChat {
+			bot.logger.Warnln(fmt.Sprintf("invalid scene scope %v in priority list; ignoring", scope))
+			continue
+		}
 		if slices.Index(newPriority, scope) >= 0 {
 			bot.logger.Warnln(fmt.Sprintf("duplicate scope %v in scene scope priority; ignoring duplicates", scope))
 			continue
@@ -782,6 +796,7 @@ func clonePlugin[T DbContext](p *Plugin[T]) Plugin[T] {
 		name:        p.name,
 		commands:    make(map[string]*Command[T], len(p.commands)),
 		payloads:    make(map[string]*Command[T], len(p.payloads)),
+		scenes:      make(map[string]*Scene[T], len(p.scenes)),
 		middlewares: append(extypes.Slice[Middleware[T]](nil), p.middlewares...),
 		skipAutoCmd: p.skipAutoCmd,
 		logger:      p.logger,
@@ -795,6 +810,9 @@ func clonePlugin[T DbContext](p *Plugin[T]) Plugin[T] {
 	for name, command := range p.payloads {
 		cloned.payloads[name] = cloneCommand(command)
 	}
+	for name, scene := range p.scenes {
+		cloned.scenes[name] = cloneScene(scene)
+	}
 	maps.Copy(cloned.handlers, p.handlers)
 
 	return cloned
@@ -810,3 +828,22 @@ func cloneCommand[T DbContext](command *Command[T]) *Command[T] {
 	cloned.middlewares = append(extypes.Slice[Middleware[T]](nil), command.middlewares...)
 	return &cloned
 }
+
+func cloneScene[T DbContext](scene *Scene[T]) *Scene[T] {
+	if scene == nil {
+		return nil
+	}
+
+	cloned := *scene
+	cloned.steps = make(map[string]SceneHandler[T], len(scene.steps))
+	cloned.commands = make(map[string]SceneHandler[T], len(scene.commands))
+
+	for name, handler := range scene.steps {
+		cloned.steps[name] = handler
+	}
+	for name, handler := range scene.commands {
+		cloned.commands[name] = handler
+	}
+
+	return &cloned
+}

bot_opts.go

@@ -5,7 +5,7 @@ import (
 	"strconv"
 	"strings"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
 // BotOpts holds configuration options for initializing a Bot.

bot_opts_test.go

@@ -4,7 +4,7 @@ import (
 	"reflect"
 	"testing"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
 func TestLoadOptsFromEnvIgnoresEmptyUpdateTypes(t *testing.T) {

bot_scene.go

@@ -1,17 +1,17 @@
 package laniakea
 
-func (bot *Bot[T]) GetSession(key string) (SceneSession, error) {
+func (bot *Bot[T]) getSession(key string) (SceneSession, error) {
 	return bot.sessionStore.Get(key)
 }
 
-func (bot *Bot[T]) SetSession(key string, session SceneSession) error {
+func (bot *Bot[T]) setSession(key string, session SceneSession) error {
 	return bot.sessionStore.Set(key, session)
 }
 
-func (bot *Bot[T]) DeleteSession(key string) error {
+func (bot *Bot[T]) deleteSession(key string) error {
 	return bot.sessionStore.Delete(key)
 }
-func (bot *Bot[T]) FindScene(name string) (*sceneMeta, bool) {
+func (bot *Bot[T]) findScene(name string) (*sceneMeta, bool) {
 	for _, plugin := range bot.plugins {
 		scene, ok := plugin.scenes[name]
 		if !ok {
@@ -33,11 +33,8 @@ func (bot *Bot[T]) FindScene(name string) (*sceneMeta, bool) {
 	return nil, false
 }
 
-func (bot *Bot[T]) FindSceneSession(ctx *MsgContext) (string, SceneSession, error) {
+func (bot *Bot[T]) findSceneSession(ctx *MsgContext) (string, SceneSession, error) {
 	var zero SceneSession
-	if ctx.Msg == nil {
-		return "", zero, ErrMessageNil
-	}
 
 	for _, scope := range bot.sceneScopePriority {
 		key, ok := buildSceneKey(scope, ctx)
@@ -56,6 +53,7 @@ func (bot *Bot[T]) FindSceneSession(ctx *MsgContext) (string, SceneSession, erro
 
 	return "", zero, ErrCantFindSession
 }
-func (bot *Bot[T]) BuildSceneKey(scope SceneScope, ctx *MsgContext) (string, bool) {
+
+func (bot *Bot[T]) buildSceneKey(scope SceneScope, ctx *MsgContext) (string, bool) {
 	return buildSceneKey(scope, ctx)
 }

bot_test.go

@@ -8,8 +8,8 @@ import (
 	"testing"
 	"time"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 func TestGetUpdateTypesReturnsCopy(t *testing.T) {

cmd_generator.go

@@ -7,7 +7,7 @@ import (
 	"sort"
 	"strings"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
 // CmdRegexp matches command names allowed for Telegram command registration.

cmd_generator_test.go

@@ -10,8 +10,8 @@ import (
 	"sync/atomic"
 	"testing"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 type roundTripFunc func(*http.Request) (*http.Response, error)

drafts.go

@@ -5,7 +5,7 @@ import (
 	"sync"
 	"sync/atomic"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
 // Interface for generating unique draft IDs.

drafts_test.go

@@ -5,8 +5,8 @@ import (
 	"strings"
 	"testing"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 func TestDraftFlushRequiresChatID(t *testing.T) {

errors.go

@@ -24,6 +24,7 @@ var (
 	ErrPayloadTypeMismatch = errors.New("payload type mismatch")
 	// ErrDraftChatIDZero reports that a draft has no target chat ID.
 	ErrDraftChatIDZero = errors.New("zero draft chat ID")
+	// ErrMessageNil reports that a required message value is nil.
 	ErrMessageNil = errors.New("message is nil")
 	// ErrMessageContextNil reports that an operation requires ctx.Msg but none is set.
 	ErrMessageContextNil = errors.New("message context is nil")
@@ -45,11 +46,18 @@ var (
 	ErrBindArgsUnsupportedFieldType = errors.New("bind args: unsupported field type")
 	// ErrBindArgsConversion reports that BindArgs could not convert a string argument into a field type.
 	ErrBindArgsConversion = errors.New("bind args: conversion failed")
+	// ErrCantFindSession reports that no scene session matches the current context.
 	ErrCantFindSession = errors.New("can't find session for this context")
+	// ErrSceneNotFound reports that the requested scene is not registered.
 	ErrSceneNotFound = errors.New("scene not found")
+	// ErrSceneStepNotFound reports that the requested scene step is not registered.
 	ErrSceneStepNotFound = errors.New("scene step not found")
-	ErrSceneCommandNotFound = errors.New("scene command not found")
+	// ErrNotInScene reports that the current context has no active scene session.
 	ErrNotInScene = errors.New("not in scene")
+	// ErrSceneEntryNotSet reports that a scene has no configured entry step.
+	ErrSceneEntryNotSet = errors.New("scene entry step not set")
+	// ErrSceneRuntimeNil reports that scene APIs were used without an attached runtime.
+	ErrSceneRuntimeNil = errors.New("scene runtime is nil")
 )
 
 func validateMessageText(text string) error {

go.mod

@@ -1,12 +1,12 @@
-module git.nix13.pw/scuroneko/laniakea
+module git.scuroneko.dev/scuroneko/laniakea
 
 go 1.26
 
 retract v1.0.0-rc.5
 
 require (
-	git.nix13.pw/scuroneko/extypes v1.2.2
-	git.nix13.pw/scuroneko/slog v1.1.2
+	git.scuroneko.dev/scuroneko/extypes v1.2.3
+	git.scuroneko.dev/scuroneko/slog v1.1.3
 	github.com/alitto/pond/v2 v2.7.0
 	golang.org/x/time v0.15.0
 )

go.sum

@@ -1,7 +1,7 @@
-git.nix13.pw/scuroneko/extypes v1.2.2 h1:N54c1ejrPs1yfIkvYuwqI7B1+8S9mDv2GqQA6sct4dk=
-git.nix13.pw/scuroneko/extypes v1.2.2/go.mod h1:b4XYk1OW1dVSiE2MT/OMuX/K/UItf1swytX6eroVYnk=
-git.nix13.pw/scuroneko/slog v1.1.2 h1:pl7tV5FN25Yso7sLYoOgBXi9+jLo5BDJHWmHlNPjpY0=
-git.nix13.pw/scuroneko/slog v1.1.2/go.mod h1:UcfRIHDqpVQHahBGM93awLDK8//AsAvOqBwwbWqMkjM=
+git.scuroneko.dev/scuroneko/extypes v1.2.3 h1:n7QsfTZEn9fJNZLXGH/LkNq4cADaRk+LTu6LNMv9y6s=
+git.scuroneko.dev/scuroneko/extypes v1.2.3/go.mod h1:MhYpXC6sloLOpoM2guf64eSOrz+ET/QJZ8toobc3Ors=
+git.scuroneko.dev/scuroneko/slog v1.1.3 h1:vI4GZykn8gDb6OJ2xq+KLcEk38M7O4e/z1kzpeRHEHw=
+git.scuroneko.dev/scuroneko/slog v1.1.3/go.mod h1:gnDap54sfZv3EuSyZd7fjOH46aLbDFpvtN2wgFcWkgE=
 github.com/alitto/pond/v2 v2.7.0 h1:c76L+yN916m/DRXjGCeUBHHu92uWnh/g1bwVk4zyyXg=
 github.com/alitto/pond/v2 v2.7.0/go.mod h1:xkjYEgQ05RSpWdfSd1nM3OVv7TBhLdy7rMp3+2Nq+yE=
 github.com/fatih/color v1.18.0 h1:S8gINlzdQ840/4pfAwic/ZE0djQEH3wM94VfqLTZcOM=

handler.go

@@ -8,7 +8,7 @@ import (
 	"fmt"
 	"strings"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
 // ErrInvalidPayloadType is returned when callback payload encoding type is unknown.

handler_test.go

@@ -4,8 +4,8 @@ import (
 	"context"
 	"testing"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 func TestCheckPrefixesSkipsEmptyPrefixes(t *testing.T) {

keyboard.go

@@ -3,8 +3,8 @@ package laniakea
 import (
 	"fmt"
 
-	"git.nix13.pw/scuroneko/extypes"
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/extypes"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
 const (

methods.go

@@ -4,7 +4,7 @@ import (
 	"context"
 	"encoding/json"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
 )
 
 // Updates fetches new updates from Telegram API using long polling.

msg_context.go

@@ -9,8 +9,8 @@ import (
 	"strings"
 	"time"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 // MsgContext holds the context for handling a Telegram message or callback query.
@@ -644,26 +644,43 @@ func (ctx *MsgContext) Context() context.Context {
 	return ctx.ctx
 }
 
+// EnterScene enters the named scene at its configured entry step.
 func (ctx *MsgContext) EnterScene(name string) error {
-	scene, ok := ctx.sceneRuntime.FindScene(name)
+	if ctx.sceneRuntime == nil {
+		return ErrSceneRuntimeNil
+	}
+
+	scene, ok := ctx.sceneRuntime.findScene(name)
 	if !ok {
 		return ErrSceneNotFound
 	}
 
-	key, ok := ctx.sceneRuntime.BuildSceneKey(scene.Scope, ctx)
+	key, ok := ctx.sceneRuntime.buildSceneKey(scene.Scope, ctx)
 	if !ok {
 		return ErrCantFindSession
 	}
+	if scene.Entry == "" {
+		return ErrSceneEntryNotSet
+	}
+	if _, ok := scene.Steps[scene.Entry]; !ok {
+		return ErrSceneStepNotFound
+	}
 
 	session := SceneSession{
 		Scene: scene.Name,
 		Step:  scene.Entry,
 	}
 
-	return ctx.sceneRuntime.SetSession(key, session)
+	return ctx.sceneRuntime.setSession(key, session)
 }
+
+// EnterSceneStep enters the named scene at a specific step.
 func (ctx *MsgContext) EnterSceneStep(name, step string) error {
-	scene, ok := ctx.sceneRuntime.FindScene(name)
+	if ctx.sceneRuntime == nil {
+		return ErrSceneRuntimeNil
+	}
+
+	scene, ok := ctx.sceneRuntime.findScene(name)
 	if !ok {
 		return ErrSceneNotFound
 	}
@@ -671,7 +688,7 @@ func (ctx *MsgContext) EnterSceneStep(name, step string) error {
 		return ErrSceneStepNotFound
 	}
 
-	key, ok := ctx.sceneRuntime.BuildSceneKey(scene.Scope, ctx)
+	key, ok := ctx.sceneRuntime.buildSceneKey(scene.Scope, ctx)
 	if !ok {
 		return ErrCantFindSession
 	}
@@ -681,10 +698,16 @@ func (ctx *MsgContext) EnterSceneStep(name, step string) error {
 		Step:  step,
 	}
 
-	return ctx.sceneRuntime.SetSession(key, session)
+	return ctx.sceneRuntime.setSession(key, session)
 }
+
+// ExitScene leaves the currently active scene for this context.
 func (ctx *MsgContext) ExitScene() error {
-	_, session, err := ctx.sceneRuntime.FindSceneSession(ctx)
+	if ctx.sceneRuntime == nil {
+		return ErrSceneRuntimeNil
+	}
+
+	_, session, err := ctx.sceneRuntime.findSceneSession(ctx)
 	if err != nil {
 		return err
 	}
@@ -692,15 +715,15 @@ func (ctx *MsgContext) ExitScene() error {
 		return ErrNotInScene
 	}
 
-	scene, ok := ctx.sceneRuntime.FindScene(session.Scene)
+	scene, ok := ctx.sceneRuntime.findScene(session.Scene)
 	if !ok {
 		return ErrSceneNotFound
 	}
 
-	key, ok := ctx.sceneRuntime.BuildSceneKey(scene.Scope, ctx)
+	key, ok := ctx.sceneRuntime.buildSceneKey(scene.Scope, ctx)
 	if !ok {
 		return ErrCantFindSession
 	}
 
-	return ctx.sceneRuntime.DeleteSession(key)
+	return ctx.sceneRuntime.deleteSession(key)
 }

msg_context_test.go

@@ -9,8 +9,8 @@ import (
 	"strings"
 	"testing"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 func TestAnswerPhotoIncludesDirectMessagesTopicID(t *testing.T) {

plugins.go

@@ -4,10 +4,10 @@ import (
 	"errors"
 	"regexp"
 
-	"git.nix13.pw/scuroneko/extypes"
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/laniakea/utils"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/extypes"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/utils"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 // CommandValueType defines the expected type of command argument.
@@ -215,11 +215,18 @@ func (p *Plugin[T]) NewPayload(exec CommandExecutor[T], command string, args ...
 	return cmd
 }
 
+// AddScene registers a multi-step scene in the plugin.
 func (p *Plugin[T]) AddScene(scene *Scene[T]) *Plugin[T] {
+	if scene == nil {
+		return p
+	}
 	scene.PluginName = p.name
 	scene.setPluginName(p.name)
+	p.scenes[scene.Name] = scene
 	return p
 }
+
+// NewScene creates, registers, and returns a new scene owned by the plugin.
 func (p *Plugin[T]) NewScene(name string) *Scene[T] {
 	scene := NewScene[T](name)
 	scene.setPluginName(p.name)

runners_test.go

@@ -6,7 +6,7 @@ import (
 	"testing"
 	"time"
 
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 func TestExecRunnersRunsOnetimeSyncRunner(t *testing.T) {

scene.go

@@ -5,11 +5,18 @@ import (
 	"sync"
 )
 
+// SceneHandler handles a scene step, scene command, or fallback message.
 type SceneHandler[T any] func(ctx *SceneContext, db T) (SceneResult, error)
+
+// Scene defines a multi-step conversational flow.
 type Scene[T any] struct {
+	// Name identifies the scene in plugin registration and session state.
 	Name string
+	// Scope controls how active scene sessions are keyed and shared.
 	Scope SceneScope
-	Entry      string // starting step
+	// Entry names the first step used by MsgContext.EnterScene.
+	Entry string
+	// PluginName stores the owning plugin name for scene resolution.
 	PluginName string
 
 	steps    map[string]SceneHandler[T]
@@ -17,6 +24,7 @@ type Scene[T any] struct {
 	message  SceneHandler[T]
 }
 
+// NewScene creates a new scene with user-chat scope by default.
 func NewScene[T any](name string) *Scene[T] {
 	return &Scene[T]{
 		Name:     name,
@@ -27,27 +35,37 @@ func NewScene[T any](name string) *Scene[T] {
 		message:  nil,
 	}
 }
+
+// SetScope changes how scene sessions are keyed and shared.
 func (s *Scene[T]) SetScope(scope SceneScope) *Scene[T] {
 	s.Scope = scope
 	return s
 }
+
+// SetEntry sets the initial step entered by MsgContext.EnterScene.
 func (s *Scene[T]) SetEntry(step string) *Scene[T] {
 	s.Entry = step
 	return s
 }
+
 func (s *Scene[T]) setPluginName(name string) *Scene[T] {
 	s.PluginName = name
 	return s
 }
 
+// OnStep registers a handler for a named scene step.
 func (s *Scene[T]) OnStep(step string, handler SceneHandler[T]) *Scene[T] {
 	s.steps[step] = handler
 	return s
 }
+
+// OnCommand registers a command handler active while the scene is running.
 func (s *Scene[T]) OnCommand(cmd string, handler SceneHandler[T]) *Scene[T] {
 	s.commands[cmd] = handler
 	return s
 }
+
+// OnMessage registers a fallback handler used when no scene command or step matches.
 func (s *Scene[T]) OnMessage(handler SceneHandler[T]) *Scene[T] {
 	s.message = handler
 	return s
@@ -77,39 +95,45 @@ func (s *Scene[T]) executeMessage(ctx *SceneContext, db T) (SceneResult, bool, e
 	return result, true, err
 }
 
+// SceneSession stores the active scene state for one session key.
 type SceneSession struct {
+	// Scene is the registered scene name for the active session.
 	Scene string
+	// Step is the current step name inside the active scene.
 	Step string
+	// Data stores opaque session payload bytes, typically JSON.
 	Data []byte
 }
 
-// SetData sets the session data. It is thread-safe and can be used to store any arbitrary data as a byte slice.
+// SetData stores arbitrary opaque session data.
 func (s *SceneSession) SetData(data []byte) {
 	s.Data = data
 }
 
-// GetData retrieves the session data. It is thread-safe and returns the data as a byte slice.
+// GetData returns the raw session data payload.
 func (s *SceneSession) GetData() []byte {
 	return s.Data
 }
+
+// HasData reports whether the session has a non-empty data payload.
 func (s *SceneSession) HasData() bool {
 	return len(s.Data) > 0
 }
 
-// ClearData clears the session data. It is thread-safe and sets the data to nil.
+// ClearData removes any stored session data.
 func (s *SceneSession) ClearData() {
 	s.Data = nil
 }
 
-// BindData binds the session data to the provided struct.
+// BindData unmarshals the stored JSON payload into v.
 func (s *SceneSession) BindData(v any) error {
 	if len(s.Data) == 0 {
-		return nil // No data to bind, return nil error
+		return nil
 	}
 	return json.Unmarshal(s.Data, v)
 }
 
-// SaveData saves the provided struct as JSON in the session data.
+// SaveData marshals v as JSON and stores it in the session.
 func (s *SceneSession) SaveData(v any) error {
 	data, err := json.Marshal(v)
 	if err != nil {
@@ -119,22 +143,27 @@ func (s *SceneSession) SaveData(v any) error {
 	return nil
 }
 
+// SessionStore persists scene sessions by key.
 type SessionStore interface {
 	Get(key string) (SceneSession, error)
 	Set(key string, session SceneSession) error
 	Delete(key string) error
 }
 
+// MemorySessionStore stores scene sessions in memory.
 type MemorySessionStore struct {
 	store map[string]SceneSession
 	mu    sync.RWMutex
 }
 
+// NewMemorySessionStore creates an empty in-memory session store.
 func NewMemorySessionStore() *MemorySessionStore {
 	return &MemorySessionStore{
 		store: make(map[string]SceneSession),
 	}
 }
+
+// Get returns the session stored under key, or the zero session when absent.
 func (s *MemorySessionStore) Get(key string) (SceneSession, error) {
 	s.mu.RLock()
 	defer s.mu.RUnlock()
@@ -143,12 +172,16 @@ func (s *MemorySessionStore) Get(key string) (SceneSession, error) {
 	}
 	return SceneSession{}, nil
 }
+
+// Set stores session under key.
 func (s *MemorySessionStore) Set(key string, session SceneSession) error {
 	s.mu.Lock()
 	s.store[key] = session
 	s.mu.Unlock()
 	return nil
 }
+
+// Delete removes the session stored under key.
 func (s *MemorySessionStore) Delete(key string) error {
 	s.mu.Lock()
 	delete(s.store, key)
@@ -156,35 +189,45 @@ func (s *MemorySessionStore) Delete(key string) error {
 	return nil
 }
 
+// SceneResult describes how scene execution should proceed after a handler returns.
 type SceneResult struct {
 	Action SceneAction
 	Next   string
 }
 
+// SceneAction controls how the bot updates scene state after a handler returns.
 type SceneAction int
 
 const (
+	// SceneActionStay keeps the current scene and step active.
 	SceneActionStay SceneAction = iota
+	// SceneActionNext moves the session to another named step.
 	SceneActionNext
+	// SceneActionExit removes the current scene session.
 	SceneActionExit
+	// SceneActionPass lets normal bot routing continue after the scene handler.
 	SceneActionPass
 )
 
+// SceneScope defines how scene sessions are keyed.
 type SceneScope int
 
 const (
+	// SceneScopeUser shares a scene across all chats for one user.
 	SceneScopeUser SceneScope = iota
+	// SceneScopeChat shares a scene across all users in one chat.
 	SceneScopeChat
+	// SceneScopeUserChat isolates a scene per user-chat pair.
 	SceneScopeUserChat
 )
 
 type sceneRuntime interface {
-	FindScene(name string) (*sceneMeta, bool)
-	GetSession(key string) (SceneSession, error)
-	SetSession(key string, session SceneSession) error
-	DeleteSession(key string) error
-	BuildSceneKey(scope SceneScope, ctx *MsgContext) (string, bool)
-	FindSceneSession(ctx *MsgContext) (string, SceneSession, error)
+	findScene(name string) (*sceneMeta, bool)
+	getSession(key string) (SceneSession, error)
+	setSession(key string, session SceneSession) error
+	deleteSession(key string) error
+	buildSceneKey(scope SceneScope, ctx *MsgContext) (string, bool)
+	findSceneSession(ctx *MsgContext) (string, SceneSession, error)
 }
 
 type sceneMeta struct {

scene_context.go

@@ -1,23 +1,41 @@
 package laniakea
 
+// SceneContext wraps MsgContext with scene session state for scene handlers.
 type SceneContext struct {
 	*MsgContext
 	sess SceneSession
 	key  string
 }
 
+// Next advances the current scene to step.
 func (ctx *SceneContext) Next(step string) SceneResult {
 	return SceneResult{
 		Action: SceneActionNext,
 		Next:   step,
 	}
 }
+
+// Stay keeps the current scene step active.
 func (ctx *SceneContext) Stay() SceneResult {
 	return SceneResult{Action: SceneActionStay}
 }
+
+// Exit leaves the current scene.
 func (ctx *SceneContext) Exit() SceneResult {
 	return SceneResult{Action: SceneActionExit}
 }
+
+// Pass stops scene handling and lets normal routing continue.
 func (ctx *SceneContext) Pass() SceneResult {
 	return SceneResult{Action: SceneActionPass}
 }
+
+// BindData unmarshals the current scene session payload into v.
+func (ctx *SceneContext) BindData(v any) error {
+	return ctx.sess.BindData(v)
+}
+
+// SaveData marshals v and stores it in the current scene session payload.
+func (ctx *SceneContext) SaveData(v any) error {
+	return ctx.sess.SaveData(v)
+}

scene_handler.go

@@ -7,7 +7,7 @@ import (
 )
 
 func (bot *Bot[T]) tryHandleScene(ctx *MsgContext) (bool, error) {
-	key, session, err := bot.FindSceneSession(ctx)
+	key, session, err := bot.findSceneSession(ctx)
 	if err != nil {
 		if errors.Is(err, ErrCantFindSession) || errors.Is(err, ErrMessageNil) {
 			return false, nil
@@ -26,6 +26,9 @@ func (bot *Bot[T]) tryHandleScene(ctx *MsgContext) (bool, error) {
 		if scene.PluginName != "" && scene.PluginName != plugin.name {
 			continue
 		}
+		if !plugin.executeMiddlewares(ctx, bot.dbContext) {
+			return false, nil
+		}
 		sceneCtx := &SceneContext{
 			MsgContext: ctx,
 			sess:       session,
@@ -40,10 +43,15 @@ func (bot *Bot[T]) executeScene(scene *Scene[T], ctx *SceneContext) (bool, error
 	if ctx.MsgContext == nil || ctx.sess.Scene == "" {
 		return false, nil
 	}
-	text := ctx.Msg.Text
+
+	var text string
+	if ctx.Msg != nil {
+		text = ctx.Msg.Text
 		if text == "" {
 			text = ctx.Msg.Caption
 		}
+	}
+
 	text = strings.TrimSpace(text)
 	prefix, cmd, args := bot.parseCommand(text)
 	if cmd != "" {
@@ -89,7 +97,6 @@ func (bot *Bot[T]) applySceneResult(scene *Scene[T], ctx *SceneContext, result S
 			return false, err
 		}
 		return true, nil
-
 	case SceneActionNext:
 		if result.Next == "" {
 			return false, ErrSceneStepNotFound
@@ -102,27 +109,37 @@ func (bot *Bot[T]) applySceneResult(scene *Scene[T], ctx *SceneContext, result S
 			return false, err
 		}
 		return true, nil
-
 	case SceneActionExit:
 		if err := bot.sessionStore.Delete(ctx.key); err != nil {
 			return false, err
 		}
 		return true, nil
-
 	case SceneActionPass:
 		return false, nil
-
 	default:
 		return false, nil
 	}
 }
 func buildSceneKey(scope SceneScope, ctx *MsgContext) (string, bool) {
+	if ctx == nil {
+		return "", false
+	}
+
 	switch scope {
 	case SceneScopeUserChat:
+		if ctx.Msg == nil || ctx.Msg.Chat == nil || ctx.FromID == 0 {
+			return "", false
+		}
 		return fmt.Sprintf("user_id:%d:chat_id:%d", ctx.FromID, ctx.Msg.Chat.ID), true
 	case SceneScopeChat:
+		if ctx.Msg == nil || ctx.Msg.Chat == nil {
+			return "", false
+		}
 		return fmt.Sprintf("chat_id:%d", ctx.Msg.Chat.ID), true
 	case SceneScopeUser:
+		if ctx.FromID == 0 {
+			return "", false
+		}
 		return fmt.Sprintf("user_id:%d", ctx.FromID), true
 	default:
 		return "", false

scene_test.go

@@ -0,0 +1,468 @@
+package laniakea
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/slog"
+)
+
+type failingSessionStore struct {
+	getErr    error
+	setErr    error
+	deleteErr error
+}
+
+func (s failingSessionStore) Get(key string) (SceneSession, error) {
+	return SceneSession{}, s.getErr
+}
+
+func (s failingSessionStore) Set(key string, session SceneSession) error {
+	return s.setErr
+}
+
+func (s failingSessionStore) Delete(key string) error {
+	return s.deleteErr
+}
+
+func TestPluginAddSceneRegistersScene(t *testing.T) {
+	plugin := NewPlugin[NoDB]("wizard")
+	scene := NewScene[NoDB]("signup")
+
+	plugin.AddScene(scene)
+
+	if got, ok := plugin.scenes["signup"]; !ok || got != scene {
+		t.Fatalf("scene was not registered in plugin: ok=%v got=%p want=%p", ok, got, scene)
+	}
+	if scene.PluginName != "wizard" {
+		t.Fatalf("unexpected plugin name on scene: got %q want %q", scene.PluginName, "wizard")
+	}
+}
+
+func TestBotAddPluginsPreservesScenesAndHandlesThem(t *testing.T) {
+	called := false
+
+	plugin := NewPlugin[NoDB]("wizard")
+	plugin.NewScene("signup").
+		SetEntry("start").
+		OnStep("start", func(ctx *SceneContext, db NoDB) (SceneResult, error) {
+			called = true
+			if ctx.Text != "hello there" {
+				t.Fatalf("unexpected scene text: got %q want %q", ctx.Text, "hello there")
+			}
+			return ctx.Exit(), nil
+		})
+
+	bot := &Bot[NoDB]{
+		logger:             slog.CreateLogger(),
+		prefixes:           []string{"/"},
+		sessionStore:       NewMemorySessionStore(),
+		sceneScopePriority: []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser},
+	}
+	bot.AddPlugins(plugin)
+
+	sceneMeta, ok := bot.findScene("signup")
+	if !ok {
+		t.Fatal("expected scene metadata to be available after plugin registration")
+	}
+	if sceneMeta.Entry != "start" {
+		t.Fatalf("unexpected scene entry: got %q want %q", sceneMeta.Entry, "start")
+	}
+
+	enterCtx := &MsgContext{
+		Msg:          &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+		FromID:       42,
+		sceneRuntime: bot,
+	}
+	if err := enterCtx.EnterScene("signup"); err != nil {
+		t.Fatalf("EnterScene returned error: %v", err)
+	}
+
+	bot.handle(context.Background(), &tgapi.Update{
+		UpdateID: 1,
+		Type:     tgapi.UpdateTypeMessage,
+		Message: &tgapi.Message{
+			MessageID: 7,
+			Text:      "hello there",
+			Chat:      &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)},
+			From:      &tgapi.User{ID: 42},
+		},
+	})
+
+	if !called {
+		t.Fatal("expected scene step handler to be called")
+	}
+
+	lookupCtx := &MsgContext{
+		Msg:    &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+		FromID: 42,
+	}
+	if _, session, err := bot.findSceneSession(lookupCtx); err == nil && session.Scene != "" {
+		t.Fatalf("expected scene session to be removed after exit, got %#v", session)
+	}
+}
+
+func TestBuildSceneKeyRejectsMissingContextFields(t *testing.T) {
+	tests := []struct {
+		name  string
+		scope SceneScope
+		ctx   *MsgContext
+	}{
+		{
+			name:  "nil context",
+			scope: SceneScopeUserChat,
+			ctx:   nil,
+		},
+		{
+			name:  "missing message for chat scope",
+			scope: SceneScopeChat,
+			ctx:   &MsgContext{},
+		},
+		{
+			name:  "missing from id for user scope",
+			scope: SceneScopeUser,
+			ctx:   &MsgContext{},
+		},
+		{
+			name:  "missing from id for user chat scope",
+			scope: SceneScopeUserChat,
+			ctx: &MsgContext{
+				Msg: &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+			},
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if key, ok := buildSceneKey(tt.scope, tt.ctx); ok || key != "" {
+				t.Fatalf("expected invalid scene key, got key=%q ok=%v", key, ok)
+			}
+		})
+	}
+}
+
+func TestEnterSceneRejectsMissingEntryConfiguration(t *testing.T) {
+	t.Run("empty entry", func(t *testing.T) {
+		plugin := NewPlugin[NoDB]("wizard")
+		plugin.NewScene("signup")
+
+		bot := &Bot[NoDB]{
+			logger:             slog.CreateLogger(),
+			sessionStore:       NewMemorySessionStore(),
+			sceneScopePriority: []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser},
+		}
+		bot.AddPlugins(plugin)
+
+		ctx := &MsgContext{
+			Msg:          &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+			FromID:       42,
+			sceneRuntime: bot,
+		}
+
+		err := ctx.EnterScene("signup")
+		if !errors.Is(err, ErrSceneEntryNotSet) {
+			t.Fatalf("expected ErrSceneEntryNotSet, got %v", err)
+		}
+	})
+
+	t.Run("missing entry step", func(t *testing.T) {
+		plugin := NewPlugin[NoDB]("wizard")
+		plugin.NewScene("signup").SetEntry("start")
+
+		bot := &Bot[NoDB]{
+			logger:             slog.CreateLogger(),
+			sessionStore:       NewMemorySessionStore(),
+			sceneScopePriority: []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser},
+		}
+		bot.AddPlugins(plugin)
+
+		ctx := &MsgContext{
+			Msg:          &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+			FromID:       42,
+			sceneRuntime: bot,
+		}
+
+		err := ctx.EnterScene("signup")
+		if !errors.Is(err, ErrSceneStepNotFound) {
+			t.Fatalf("expected ErrSceneStepNotFound, got %v", err)
+		}
+	})
+}
+
+func TestSceneContextMethodsRequireRuntime(t *testing.T) {
+	ctx := &MsgContext{}
+
+	if err := ctx.EnterScene("signup"); !errors.Is(err, ErrSceneRuntimeNil) {
+		t.Fatalf("expected ErrSceneRuntimeNil from EnterScene, got %v", err)
+	}
+	if err := ctx.EnterSceneStep("signup", "start"); !errors.Is(err, ErrSceneRuntimeNil) {
+		t.Fatalf("expected ErrSceneRuntimeNil from EnterSceneStep, got %v", err)
+	}
+	if err := ctx.ExitScene(); !errors.Is(err, ErrSceneRuntimeNil) {
+		t.Fatalf("expected ErrSceneRuntimeNil from ExitScene, got %v", err)
+	}
+}
+
+func TestSceneCommandHandlerRunsBeforeStep(t *testing.T) {
+	sceneCommandCalled := false
+	stepCalled := false
+
+	plugin := NewPlugin[NoDB]("wizard")
+	plugin.NewScene("signup").
+		SetEntry("start").
+		OnStep("start", func(ctx *SceneContext, db NoDB) (SceneResult, error) {
+			stepCalled = true
+			return ctx.Stay(), nil
+		}).
+		OnCommand("cancel", func(ctx *SceneContext, db NoDB) (SceneResult, error) {
+			sceneCommandCalled = true
+			if ctx.Prefix != "/" {
+				t.Fatalf("unexpected prefix: got %q want /", ctx.Prefix)
+			}
+			if ctx.Text != "right now" {
+				t.Fatalf("unexpected scene command text: got %q want %q", ctx.Text, "right now")
+			}
+			if len(ctx.Args) != 2 || ctx.Args[0] != "right" || ctx.Args[1] != "now" {
+				t.Fatalf("unexpected scene command args: %#v", ctx.Args)
+			}
+			return ctx.Exit(), nil
+		})
+
+	bot := &Bot[NoDB]{
+		logger:             slog.CreateLogger(),
+		prefixes:           []string{"/"},
+		sessionStore:       NewMemorySessionStore(),
+		sceneScopePriority: []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser},
+	}
+	bot.AddPlugins(plugin)
+
+	enterCtx := &MsgContext{
+		Msg:          &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+		FromID:       42,
+		sceneRuntime: bot,
+	}
+	if err := enterCtx.EnterScene("signup"); err != nil {
+		t.Fatalf("EnterScene returned error: %v", err)
+	}
+
+	bot.handle(context.Background(), &tgapi.Update{
+		UpdateID: 2,
+		Type:     tgapi.UpdateTypeMessage,
+		Message: &tgapi.Message{
+			MessageID: 8,
+			Text:      "/cancel right now",
+			Chat:      &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)},
+			From:      &tgapi.User{ID: 42},
+		},
+	})
+
+	if !sceneCommandCalled {
+		t.Fatal("expected scene command handler to be called")
+	}
+	if stepCalled {
+		t.Fatal("expected scene command to short-circuit the scene step")
+	}
+}
+
+func TestScenePassDoesNotPersistSessionData(t *testing.T) {
+	commandCalled := false
+
+	plugin := NewPlugin[NoDB]("wizard")
+	plugin.NewCommand(func(ctx *MsgContext, db NoDB) error {
+		commandCalled = true
+		return nil
+	}, "ping")
+	plugin.NewScene("signup").
+		SetEntry("start").
+		OnStep("start", func(ctx *SceneContext, db NoDB) (SceneResult, error) {
+			if err := ctx.SaveData(struct {
+				Value string `json:"value"`
+			}{Value: "changed"}); err != nil {
+				t.Fatalf("SaveData returned error: %v", err)
+			}
+			return ctx.Pass(), nil
+		})
+
+	bot := &Bot[NoDB]{
+		logger:             slog.CreateLogger(),
+		prefixes:           []string{"/"},
+		sessionStore:       NewMemorySessionStore(),
+		sceneScopePriority: []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser},
+	}
+	bot.AddPlugins(plugin)
+
+	enterCtx := &MsgContext{
+		Msg:          &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+		FromID:       42,
+		sceneRuntime: bot,
+	}
+	if err := enterCtx.EnterScene("signup"); err != nil {
+		t.Fatalf("EnterScene returned error: %v", err)
+	}
+
+	key, ok := buildSceneKey(SceneScopeUserChat, &MsgContext{
+		Msg:    &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+		FromID: 42,
+	})
+	if !ok {
+		t.Fatal("expected scene key to be built")
+	}
+
+	before, err := bot.sessionStore.Get(key)
+	if err != nil {
+		t.Fatalf("Get before handle returned error: %v", err)
+	}
+	if before.HasData() {
+		t.Fatalf("expected empty session data before handle, got %#v", before)
+	}
+
+	bot.handle(context.Background(), &tgapi.Update{
+		UpdateID: 3,
+		Type:     tgapi.UpdateTypeMessage,
+		Message: &tgapi.Message{
+			MessageID: 9,
+			Text:      "/ping",
+			Chat:      &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)},
+			From:      &tgapi.User{ID: 42},
+		},
+	})
+
+	if !commandCalled {
+		t.Fatal("expected normal command routing to continue after SceneActionPass")
+	}
+
+	after, err := bot.sessionStore.Get(key)
+	if err != nil {
+		t.Fatalf("Get after handle returned error: %v", err)
+	}
+	if after.Scene != "signup" || after.Step != "start" {
+		t.Fatalf("unexpected session after pass: %#v", after)
+	}
+	if after.HasData() {
+		t.Fatalf("expected SceneActionPass to leave session data unchanged, got %#v", after)
+	}
+}
+
+func TestSceneMessageFallbackRunsWhenNoCommandOrStepMatch(t *testing.T) {
+	fallbackCalled := false
+
+	plugin := NewPlugin[NoDB]("wizard")
+	plugin.NewScene("signup").
+		SetEntry("start").
+		OnStep("start", func(ctx *SceneContext, db NoDB) (SceneResult, error) {
+			return ctx.Stay(), nil
+		}).
+		OnMessage(func(ctx *SceneContext, db NoDB) (SceneResult, error) {
+			fallbackCalled = true
+			if ctx.Text != "hello fallback" {
+				t.Fatalf("unexpected fallback text: got %q want %q", ctx.Text, "hello fallback")
+			}
+			return ctx.Exit(), nil
+		})
+
+	bot := &Bot[NoDB]{
+		logger:             slog.CreateLogger(),
+		prefixes:           []string{"/"},
+		sessionStore:       NewMemorySessionStore(),
+		sceneScopePriority: []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser},
+	}
+	bot.AddPlugins(plugin)
+
+	enterCtx := &MsgContext{
+		Msg:          &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+		FromID:       42,
+		sceneRuntime: bot,
+	}
+	if err := enterCtx.EnterScene("signup"); err != nil {
+		t.Fatalf("EnterScene returned error: %v", err)
+	}
+
+	key, ok := buildSceneKey(SceneScopeUserChat, &MsgContext{
+		Msg:    &tgapi.Message{Chat: &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)}},
+		FromID: 42,
+	})
+	if !ok {
+		t.Fatal("expected scene key to be built")
+	}
+	if err := bot.sessionStore.Set(key, SceneSession{Scene: "signup", Step: "unknown"}); err != nil {
+		t.Fatalf("Set returned error: %v", err)
+	}
+
+	bot.handle(context.Background(), &tgapi.Update{
+		UpdateID: 4,
+		Type:     tgapi.UpdateTypeMessage,
+		Message: &tgapi.Message{
+			MessageID: 10,
+			Text:      "hello fallback",
+			Chat:      &tgapi.Chat{ID: 100, Type: string(tgapi.ChatTypePrivate)},
+			From:      &tgapi.User{ID: 42},
+		},
+	})
+
+	if !fallbackCalled {
+		t.Fatal("expected scene fallback handler to be called")
+	}
+}
+
+func TestFindSceneSessionSupportsUserScopeWithoutMessage(t *testing.T) {
+	bot := &Bot[NoDB]{
+		logger:             slog.CreateLogger(),
+		sessionStore:       NewMemorySessionStore(),
+		sceneScopePriority: []SceneScope{SceneScopeUser, SceneScopeChat, SceneScopeUserChat},
+	}
+
+	if err := bot.sessionStore.Set("user_id:42", SceneSession{Scene: "signup", Step: "start"}); err != nil {
+		t.Fatalf("Set returned error: %v", err)
+	}
+
+	key, session, err := bot.findSceneSession(&MsgContext{FromID: 42})
+	if err != nil {
+		t.Fatalf("findSceneSession returned error: %v", err)
+	}
+	if key != "user_id:42" {
+		t.Fatalf("unexpected session key: got %q want %q", key, "user_id:42")
+	}
+	if session.Scene != "signup" || session.Step != "start" {
+		t.Fatalf("unexpected session: %#v", session)
+	}
+}
+
+func TestSceneStoreErrorsPropagate(t *testing.T) {
+	getErr := errors.New("get failed")
+	setErr := errors.New("set failed")
+
+	t.Run("find scene session get error", func(t *testing.T) {
+		bot := &Bot[NoDB]{
+			logger:             slog.CreateLogger(),
+			sessionStore:       failingSessionStore{getErr: getErr},
+			sceneScopePriority: []SceneScope{SceneScopeUser},
+		}
+
+		_, _, err := bot.findSceneSession(&MsgContext{FromID: 42})
+		if !errors.Is(err, getErr) {
+			t.Fatalf("expected getErr, got %v", err)
+		}
+	})
+
+	t.Run("apply scene result set error", func(t *testing.T) {
+		scene := NewScene[NoDB]("signup").OnStep("start", func(ctx *SceneContext, db NoDB) (SceneResult, error) {
+			return ctx.Stay(), nil
+		})
+		bot := &Bot[NoDB]{
+			logger:             slog.CreateLogger(),
+			sessionStore:       failingSessionStore{setErr: setErr},
+			sceneScopePriority: []SceneScope{SceneScopeUserChat, SceneScopeChat, SceneScopeUser},
+		}
+
+		_, err := bot.applySceneResult(scene, &SceneContext{
+			MsgContext: &MsgContext{},
+			sess:       SceneSession{Scene: "signup", Step: "start"},
+			key:        "user_id:42:chat_id:100",
+		}, SceneResult{Action: SceneActionStay})
+		if !errors.Is(err, setErr) {
+			t.Fatalf("expected setErr, got %v", err)
+		}
+	})
+}

tgapi/api.go

@@ -9,8 +9,8 @@ import (
 	"net/http"
 	"time"
 
-	"git.nix13.pw/scuroneko/laniakea/utils"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/laniakea/utils"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 // APIOpts holds configuration options for initializing the Telegram API client.

tgapi/messages_types.go

@@ -1,6 +1,6 @@
 package tgapi
 
-import "git.nix13.pw/scuroneko/extypes"
+import "git.scuroneko.dev/scuroneko/extypes"
 
 // MessageID represents a message identifier wrapper returned by some API methods.
 type MessageID struct {

tgapi/methods.go

@@ -6,7 +6,7 @@ import (
 	"io"
 	"net/http"
 
-	"git.nix13.pw/scuroneko/laniakea/utils"
+	"git.scuroneko.dev/scuroneko/laniakea/utils"
 )
 
 // UpdateParams holds parameters for the getUpdates method.

tgapi/uploader_api.go

@@ -10,8 +10,8 @@ import (
 	"strings"
 	"time"
 
-	"git.nix13.pw/scuroneko/laniakea/utils"
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/laniakea/utils"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 const (

utils.go

@@ -3,7 +3,7 @@ package laniakea
 import (
 	"strings"
 
-	"git.nix13.pw/scuroneko/laniakea/utils"
+	"git.scuroneko.dev/scuroneko/laniakea/utils"
 )
 
 // Ptr returns a pointer to v.

utils/multipart_test.go

@@ -6,8 +6,8 @@ import (
 	"mime/multipart"
 	"testing"
 
-	"git.nix13.pw/scuroneko/laniakea/tgapi"
-	"git.nix13.pw/scuroneko/laniakea/utils"
+	"git.scuroneko.dev/scuroneko/laniakea/tgapi"
+	"git.scuroneko.dev/scuroneko/laniakea/utils"
 )
 
 type multipartEncodeParams struct {

utils/utils.go

@@ -3,7 +3,7 @@ package utils
 import (
 	"os"
 
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 // GetLoggerLevel returns DEBUG when DEBUG=true in env, otherwise FATAL.

utils/utils_test.go

@@ -6,7 +6,7 @@ import (
 	"strings"
 	"testing"
 
-	"git.nix13.pw/scuroneko/slog"
+	"git.scuroneko.dev/scuroneko/slog"
 )
 
 func TestCreateFileLoggerWritesToConfiguredFile(t *testing.T) {