Refactor LLM route-first provider API (#28523)

packages/llm/test/provider/bedrock-converse-cache.recorded.test.ts

@@ -2,7 +2,7 @@ import { describe, expect } from "bun:test"
 import { Effect } from "effect"
 import { CacheHint, LLM } from "../../src"
 import { LLMClient } from "../../src/route"
-import * as BedrockConverse from "../../src/protocols/bedrock-converse"
+import { AmazonBedrock } from "../../src/providers"
 import { LARGE_CACHEABLE_SYSTEM } from "../recorded-scenarios"
 import { recordedTests } from "../recorded-test"
 
@@ -12,15 +12,14 @@ const RECORDING_REGION = process.env.BEDROCK_RECORDING_REGION ?? "us-east-1"
 // doesn't reliably surface `cacheRead`/`cacheWrite` in usage, so the second
 // call wouldn't deterministically prove cache mapping works. Override with
 // BEDROCK_CACHE_MODEL_ID if your account has access elsewhere.
-const model = BedrockConverse.model({
-  id: process.env.BEDROCK_CACHE_MODEL_ID ?? "us.anthropic.claude-haiku-4-5-20251001-v1:0",
+const model = AmazonBedrock.configure({
   credentials: {
     region: RECORDING_REGION,
     accessKeyId: process.env.AWS_ACCESS_KEY_ID ?? "fixture",
     secretAccessKey: process.env.AWS_SECRET_ACCESS_KEY ?? "fixture",
     sessionToken: process.env.AWS_SESSION_TOKEN,
   },
-})
+}).model(process.env.BEDROCK_CACHE_MODEL_ID ?? "us.anthropic.claude-haiku-4-5-20251001-v1:0")
 
 const cacheRequest = LLM.request({
   id: "recorded_bedrock_cache",