opencode: lazily compose default layers

defaultLayer is currently composed at import time. This makes module evaluation
sensitive to transitive import order, even though the layer graph itself is
unchanged.

Wrap these compositions in Layer.suspend() so the same graph is built on
demand instead of during module load. This reduces init-order coupling and
makes import reordering for startup work safer.

packages/opencode/src/agent/agent.ts

@@ -398,11 +398,13 @@ export namespace Agent {
     }),
   )
 
-  export const defaultLayer = layer.pipe(
-    Layer.provide(Provider.defaultLayer),
-    Layer.provide(Auth.defaultLayer),
-    Layer.provide(Config.defaultLayer),
-    Layer.provide(Skill.defaultLayer),
+  export const defaultLayer = Layer.suspend(() =>
+    layer.pipe(
+      Layer.provide(Provider.defaultLayer),
+      Layer.provide(Auth.defaultLayer),
+      Layer.provide(Config.defaultLayer),
+      Layer.provide(Skill.defaultLayer),
+    ),
   )
 
   const { runPromise } = makeRuntime(Service, defaultLayer)

packages/opencode/src/command/index.ts

@@ -183,9 +183,7 @@ export namespace Command {
     }),
   )
 
-  export const defaultLayer = layer.pipe(
-    Layer.provide(Config.defaultLayer),
-    Layer.provide(MCP.defaultLayer),
-    Layer.provide(Skill.defaultLayer),
+  export const defaultLayer = Layer.suspend(() =>
+    layer.pipe(Layer.provide(Config.defaultLayer), Layer.provide(MCP.defaultLayer), Layer.provide(Skill.defaultLayer)),
   )
 }

packages/opencode/src/session/index.ts

@@ -678,7 +678,9 @@ export namespace Session {
     }),
   )
 
-  export const defaultLayer = layer.pipe(Layer.provide(Bus.layer), Layer.provide(Storage.defaultLayer))
+  export const defaultLayer = Layer.suspend(() =>
+    layer.pipe(Layer.provide(Bus.layer), Layer.provide(Storage.defaultLayer)),
+  )
 
   const { runPromise } = makeRuntime(Service, defaultLayer)
 

packages/opencode/src/share/share-next.ts

@@ -339,12 +339,14 @@ export namespace ShareNext {
     }),
   )
 
-  export const defaultLayer = layer.pipe(
-    Layer.provide(Bus.layer),
-    Layer.provide(Account.defaultLayer),
-    Layer.provide(Config.defaultLayer),
-    Layer.provide(FetchHttpClient.layer),
-    Layer.provide(Provider.defaultLayer),
-    Layer.provide(Session.defaultLayer),
+  export const defaultLayer = Layer.suspend(() =>
+    layer.pipe(
+      Layer.provide(Bus.layer),
+      Layer.provide(Account.defaultLayer),
+      Layer.provide(Config.defaultLayer),
+      Layer.provide(FetchHttpClient.layer),
+      Layer.provide(Provider.defaultLayer),
+      Layer.provide(Session.defaultLayer),
+    ),
   )
 }

packages/opencode/src/skill/index.ts

@@ -230,11 +230,13 @@ export namespace Skill {
     }),
   )
 
-  export const defaultLayer = layer.pipe(
-    Layer.provide(Discovery.defaultLayer),
-    Layer.provide(Config.defaultLayer),
-    Layer.provide(Bus.layer),
-    Layer.provide(AppFileSystem.defaultLayer),
+  export const defaultLayer = Layer.suspend(() =>
+    layer.pipe(
+      Layer.provide(Discovery.defaultLayer),
+      Layer.provide(Config.defaultLayer),
+      Layer.provide(Bus.layer),
+      Layer.provide(AppFileSystem.defaultLayer),
+    ),
   )
 
   export function fmt(list: Info[], opts: { verbose: boolean }) {