fix(core): settle unadvertised tool calls and repair session hook test contexts

packages/core/test/lib/tool.ts

@@ -6,6 +6,7 @@ import { Tool } from "@opencode-ai/core/tool/tool"
 import { Tools } from "@opencode-ai/core/tool/tools"
 import type { Context as PluginContext } from "@opencode-ai/plugin/v2/effect/plugin"
 import { Effect, type Scope } from "effect"
+import { host } from "../plugin/host"
 
 export const toolIdentity = {
   agent: AgentV2.ID.make("build"),
@@ -48,7 +49,7 @@ export const registerToolPlugin = <R>(plugin: {
 }): Effect.Effect<void, never, R | Tools.Service | Scope.Scope> =>
   Effect.gen(function* () {
     const tools = yield* Tools.Service
-    const context: Pick<PluginContext, "tool"> = {
+    const context = host({
       tool: {
         transform: (callback) =>
           Effect.gen(function* () {
@@ -71,8 +72,8 @@ export const registerToolPlugin = <R>(plugin: {
           }),
         hook: () => Effect.die("registerToolPlugin does not support tool hooks"),
       },
-    }
-    yield* plugin.effect(context as PluginContext)
+    })
+    yield* plugin.effect(context)
   })
 
 export const settleTool = (registry: ToolRegistry.Interface, input: ToolRegistry.ExecuteInput, model = testModel) =>