fix(auto-instrumentation): Use sync channel for AI SDK CJS streamText/streamObject in v4+ (#1768)

## Summary

- The CJS bundle entries for `streamText` and `streamObject` used `kind:
"Async"` for all versions (`>=3.0.0`), but
`DefaultStreamTextResult`/`DefaultStreamObjectResult` have no `.then()`,
so `asyncEnd` never fires when the transformer wraps via
`promise.then()`
- Splits the CJS entries to mirror the existing ESM split (which was
already correct in main):
- `>=3.0.0 <4.0.0`: `kind: "Async"` — v3, where the function was
genuinely async
- `>=4.0.0`: `kind: "Sync"` + sync channel — v4+, after the sync
refactor
- The `traceSyncStreamChannel` handlers for
`streamTextSync`/`streamObjectSync` already exist in `ai-sdk-plugin.ts`
(they were added when the ESM path was fixed), so no plugin change is
needed

## Test plan

- [x] `ai-sdk-plugin.test.ts` — 96 tests pass
- [x] Pre-existing test failures in `transformation.test.ts` /
`loader-hook.test.ts` confirmed unrelated (same failures on `main`)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: Qard

js/src/auto-instrumentations/configs/ai-sdk.ts

@@ -70,14 +70,26 @@ export const aiSDKConfigs: InstrumentationConfig[] = [
     channelName: aiSDKChannels.streamText.channelName,
     module: {
       name: "ai",
-      versionRange: ">=3.0.0",
+      versionRange: ">=3.0.0 <4.0.0",
       filePath: "dist/index.js",
     },
     functionQuery: {
       functionName: "streamText",
       kind: "Async",
     },
   },
+  {
+    channelName: aiSDKChannels.streamTextSync.channelName,
+    module: {
+      name: "ai",
+      versionRange: ">=4.0.0",
+      filePath: "dist/index.js",
+    },
+    functionQuery: {
+      functionName: "streamText",
+      kind: "Sync",
+    },
+  },
 
   // generateObject - async function
   {
@@ -188,14 +200,26 @@ export const aiSDKConfigs: InstrumentationConfig[] = [
     channelName: aiSDKChannels.streamObject.channelName,
     module: {
       name: "ai",
-      versionRange: ">=3.0.0",
+      versionRange: ">=3.0.0 <4.0.0",
       filePath: "dist/index.js",
     },
     functionQuery: {
       functionName: "streamObject",
       kind: "Async",
     },
   },
+  {
+    channelName: aiSDKChannels.streamObjectSync.channelName,
+    module: {
+      name: "ai",
+      versionRange: ">=4.0.0",
+      filePath: "dist/index.js",
+    },
+    functionQuery: {
+      functionName: "streamObject",
+      kind: "Sync",
+    },
+  },
 
   // Agent.generate - async method (v5 only)
   // The compiled AI SDK bundle emits this as an anonymous class method, so we