diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a92e4c..6b05a78 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,8 @@ The English README is the source of truth; localized READMEs may lag.
 
 ## Unreleased
 
+## 0.9.0 - 2026-05-14
+
 ### Added
 - Simulator base device auto-creation (#110): when `vch build --device "iPhone 17" --runtime "iOS 26.5"` is invoked and the device type + runtime are installed but no base device instance exists, vch now automatically creates it via `xcrun simctl create`. This removes the need for users to manually run `simctl create` before their first build — the device type + runtime are sufficient. The created device is not auto-deleted; the user owns its lifecycle and can clean up via `vch doctor --clean` if desired.
 
diff --git a/Sources/VibeChardCore/Domain/VibeChard.swift b/Sources/VibeChardCore/Domain/VibeChard.swift
index 86a988f..09c4afa 100644
--- a/Sources/VibeChardCore/Domain/VibeChard.swift
+++ b/Sources/VibeChardCore/Domain/VibeChard.swift
@@ -11,7 +11,7 @@ public enum VibeChard {
     /// Semantic version of the `vch` binary.
     /// Bumped manually in `git tag v*` releases. The release workflow
     /// fails fast if this constant doesn't match the pushed tag.
-    public static let version = "0.8.1"
+    public static let version = "0.9.0"
 
     /// Canonical public repository URL used for version-pinned docs.
     public static let repositoryURL = "https://github.com/Maples7/VibeChard"
diff --git a/docs/agent-runbook.md b/docs/agent-runbook.md
index b72abb2..e55b5ad 100644
--- a/docs/agent-runbook.md
+++ b/docs/agent-runbook.md
@@ -78,6 +78,14 @@ Run the app on the task's simulator clone:
 vch run fix-login --scheme MyApp --device "iPhone 16" -- -UITestMode
 ```
 
+If the requested device type and runtime are installed but no base
+simulator exists yet, pass the runtime explicitly. vch will create the
+base simulator before cloning it for the task:
+
+```sh
+vch test fix-login --scheme MyApp --device "iPhone 17" --runtime "iOS 26.5"
+```
+
 Open the worktree in Xcode for manual inspection or to read build logs:
 
 ```sh
@@ -148,6 +156,11 @@ If the task is abandoned:
 vch remove fix-login
 ```
 
+For tasks registered with `vch new --adopt-current`, `vch remove`
+unregisters vch and deletes only `.vch/` and `.agent-build/`. The
+external git worktree and branch remain in place; use git directly if
+the user also wants those removed.
+
 Clean up already-merged tasks:
 
 ```sh