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/client/src/generated/types.ts

@@ -512,6 +512,7 @@ export type SessionsContextOutput = {
               readonly id: string
               readonly text: string
               readonly providerMetadata?: { readonly [x: string]: { readonly [x: string]: JsonValue } }
+              readonly time?: { readonly created: number; readonly completed?: number }
             }
           | {
               readonly type: "tool"
@@ -1589,6 +1590,7 @@ export type SessionsMessageOutput = {
               readonly id: string
               readonly text: string
               readonly providerMetadata?: { readonly [x: string]: { readonly [x: string]: JsonValue } }
+              readonly time?: { readonly created: number; readonly completed?: number }
             }
           | {
               readonly type: "tool"