feat(opencode): fff search tools (#27802)

Co-authored-by: Shoubhit Dash <shoubhit2005@gmail.com>

packages/opencode/test/tool/read.test.ts

@@ -8,6 +8,7 @@ import { FSUtil } from "@opencode-ai/core/fs-util"
 import { Global } from "@opencode-ai/core/global"
 import { Config } from "@/config/config"
 import { RuntimeFlags } from "@/effect/runtime-flags"
+import { Search } from "@opencode-ai/core/filesystem/search"
 import { LSP } from "@/lsp/lsp"
 import { Permission } from "../../src/permission"
 import { SessionID, MessageID } from "../../src/session/schema"
@@ -59,6 +60,7 @@ const readLayer = (flags: Partial<RuntimeFlags.Info> = {}) =>
     Instruction.defaultLayer,
     LSP.defaultLayer,
     referenceLayer(flags),
+    Search.defaultLayer,
     Truncate.defaultLayer,
   )