feat(core): port v2 runtime fixes onto dev

Cherry-picks the packages/core changes from the v2 branch onto dev:
- combined ordered stdout/stderr in AppProcess + bash structured output
- edit/apply-patch return FileDiff info with status and line stats
- ignore no-op model switches; record reasoning timestamps
- return unexpected local tool defects to the model and continue
- keep OAuth account metadata out of request bodies
- nest OpenAI reasoning effort/summary options
- load OpenCode provider config asynchronously; batch plugin boot
- export latest public event manifest

Includes the supporting schema reasoning time field and regenerated
client/SDK types.

packages/sdk/js/src/v2/gen/types.gen.ts

@@ -4030,6 +4030,10 @@ export type SessionMessageAssistantReasoning = {
   id: string
   text: string
   providerMetadata?: LlmProviderMetadata
+  time?: {
+    created: number
+    completed?: number
+  }
 }
 
 export type SessionMessageToolStatePending = {