Merge bulk into evaluate

.changeset/adapter-bulk-evaluation.md

@@ -2,8 +2,8 @@
 '@flags-sdk/vercel': minor
 ---
 
-Faster evaluation of flags when using the Vercel adapter via `bulk()`.
+Faster evaluation of flags when using the Vercel adapter via `evaluate()`.
 
-This version of `flags-sdk/vercel` implements `bulkDecide` on the Vercel Flags adapter so flags can be evaluated together via `bulk()` from `flags/next`.
+This version of `flags-sdk/vercel` implements `bulkDecide` on the Vercel Flags adapter so flags can be evaluated together via `evaluate()` from `flags/next`.
 
-This improves performance by avoiding the per-flag overhead of separate `evaluate()` calls. We've seen a 10x improvement in evaluation time for large batches of flags.
+This improves performance by avoiding the per-flag overhead of separate `decide()` calls. We've seen a 10x improvement in evaluation time for large batches of flags.

.changeset/flags-evaluate.md

@@ -0,0 +1,18 @@
+---
+'flags': minor
+---
+
+Extend `evaluate()` from the `flags/next` entry point to resolve multiple flags in a single call.
+
+```tsx
+import { evaluate } from 'flags/next';
+import { flagA, flagB } from '../flags';
+
+// pass a list of flags
+const [valueA, valueB] = await evaluate([flagA, flagB]);
+
+// pass an object
+const { a, b } = await evaluate({ a: flagA, b: flagB });
+```
+
+Adapters can now opt into batched evaluation by implementing an optional `bulkDecide` method and setting a stable `adapterId`. When both are present, `evaluate()` groups flags that share the same `adapterId` and `identify` source and invokes `bulkDecide` once per group instead of calling `decide` per flag. Flags without a bulk-capable adapter (or with an inline `decide`) still resolve through the normal per-flag path inside `evaluate()` and benefit from the shared per-request headers, cookies, and overrides reads.

packages/adapter-vercel/src/index.ts

@@ -32,8 +32,8 @@ export function createVercelAdapter(
 
   // Stable identity for this adapter's underlying flagsClient. Captured in
   // the closure so every adapter object the factory below returns shares it,
-  // letting `bulk()` group flags from multiple `vercelAdapter()` calls into
-  // a single `bulkDecide` invocation.
+  // letting `evaluate()` group flags from multiple `vercelAdapter()` calls
+  // into a single `bulkDecide` invocation.
   const adapterId = Symbol('vercelAdapter');
 
   return function vercelAdapter<ValueType, EntitiesType>(): Adapter<