2.0.0: changelog and skill docs for slugs and environments

Claude-Session: https://claude.ai/code/session_01SMCvdwDmuxoaqGgvGBLk1V

skills/rudder-web-sdk/reference/scenarios.md

@@ -122,7 +122,7 @@ counter response may carry the next `PendingEffect`.
 }
 ```
 
-These wrap `client.battlePass` with the run's `scenarioId`/`nodeId`/`runId`
+These wrap `client.battlePass` with the run's `scenarioSlug`/`nodeId`/`runId`
 already bound — prefer them over calling the service manually.
 
 ### `BattlePassLevelEffect` — a `battlepass_level` node (single claimable tier)
@@ -134,9 +134,9 @@ already bound — prefer them over calling the service manually.
 ### Run lifecycle effects
 
 ```ts
-interface ScenarioCompletedEffect { readonly runId: string; readonly scenarioId: string }
+interface ScenarioCompletedEffect { readonly runId: string; readonly scenarioSlug: string }
 interface ScenarioFailedEffect {
-  readonly runId: string; readonly scenarioId: string; readonly nodeId: string;
+  readonly runId: string; readonly scenarioSlug: string; readonly nodeId: string;
   readonly error: Error;
 }
 ```
@@ -154,7 +154,7 @@ not delivered to the client.
 ## Reliability notes
 
 - Completion methods POST `/sdk/v1/scenarios/callback` with
-  `{scenarioId, runId, nodeId, handle}` using the handles `output`,
+  `{scenarioSlug, runId, nodeId, handle}` using the handles `output`,
   `onPurchase`, `onDecline`, `onEnd`, `onClaim`, `onComplete`, `onLevelUp`,
   `onPremiumPurchase`.
 - Transient callback failures (network error, 5xx) leave the effect active