refactor(cli): split doctor/model-resolution and run/events into focused modules

Doctor checks:
- model-resolution-cache.ts, model-resolution-config.ts
- model-resolution-details.ts, model-resolution-effective-model.ts
- model-resolution-types.ts, model-resolution-variant.ts

Run events:
- event-formatting.ts, event-handlers.ts
- event-state.ts, event-stream-processor.ts

src/cli/run/event-stream-processor.ts

@@ -0,0 +1,43 @@
+import pc from "picocolors"
+import type { RunContext, EventPayload } from "./types"
+import type { EventState } from "./event-state"
+import { logEventVerbose } from "./event-formatting"
+import {
+  handleSessionError,
+  handleSessionIdle,
+  handleSessionStatus,
+  handleMessagePartUpdated,
+  handleMessageUpdated,
+  handleToolExecute,
+  handleToolResult,
+} from "./event-handlers"
+
+export async function processEvents(
+  ctx: RunContext,
+  stream: AsyncIterable<unknown>,
+  state: EventState
+): Promise<void> {
+  for await (const event of stream) {
+    if (ctx.abortController.signal.aborted) break
+
+    try {
+      const payload = event as EventPayload
+      if (!payload?.type) {
+        console.error(pc.dim(`[event] no type: ${JSON.stringify(event)}`))
+        continue
+      }
+
+      logEventVerbose(ctx, payload)
+
+      handleSessionError(ctx, payload, state)
+      handleSessionIdle(ctx, payload, state)
+      handleSessionStatus(ctx, payload, state)
+      handleMessagePartUpdated(ctx, payload, state)
+      handleMessageUpdated(ctx, payload, state)
+      handleToolExecute(ctx, payload, state)
+      handleToolResult(ctx, payload, state)
+    } catch (err) {
+      console.error(pc.red(`[event error] ${err}`))
+    }
+  }
+}