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/core/test/config/config.test.ts

@@ -601,9 +601,9 @@ describe("Config", () => {
               models: {
                 model: {
                   request: {
-                    body: { temperature: 0.3, reasoning_effort: "high", service_tier: "priority" },
+                    body: { temperature: 0.3, reasoning: { effort: "high" }, service_tier: "priority" },
                   },
-                  variants: [{ id: "high", body: { reasoning_effort: "high", reasoning_summary: "auto" } }],
+                  variants: [{ id: "high", body: { reasoning: { effort: "high", summary: "auto" } } }],
                 },
               },
             })