rename app data API

Align docs, examples, and tests with AppData and NoData

Update handler, scene, runner, and plugin generics to the new naming

Ignore .codex and record the cleanup in the changelog

runners.go

@@ -7,7 +7,7 @@ import (
 
 // RunnerFn is the function type for a runner. It receives a pointer to
 // the Bot and returns an error if execution fails.
-type RunnerFn[T DbContext] func(*Bot[T]) error
+type RunnerFn[T AppData] func(*Bot[T]) error
 
 // Runner represents a configurable background or one-time task to be
 // executed by a Bot.
@@ -20,7 +20,7 @@ type RunnerFn[T DbContext] func(*Bot[T]) error
 //   - onetime=true, async=true:  Run once in a goroutine (non-blocking).
 //   - onetime=false, async=true: Run repeatedly in a goroutine with timeout.
 //   - onetime=false, async=false: Invalid configuration — ignored with warning.
-type Runner[T DbContext] struct {
+type Runner[T AppData] struct {
 	name    string        // Human-readable name for logging
 	onetime bool          // If true, runs once; if false, runs periodically
 	async   bool          // If true, runs in a goroutine; else, runs synchronously
@@ -33,7 +33,7 @@ type Runner[T DbContext] struct {
 //
 // Builder methods (Onetime, Async, Timeout) can be chained to customize behavior.
 // DO NOT call builder methods concurrently or after Execute().
-func NewRunner[T DbContext](name string, fn RunnerFn[T]) Runner[T] {
+func NewRunner[T AppData](name string, fn RunnerFn[T]) Runner[T] {
 	return Runner[T]{
 		name:    name,
 		fn:      fn,