test: add bun workspace tests

examples/workspace/BUILD.bazel

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+load("//bun:defs.bzl", "bun_bundle", "ts_library")
+
+package(default_visibility = ["//visibility:public"])
+
+exports_files([
+    "README.md",
+    "package.json",
+    "packages/pkg-a/package.json",
+    "packages/pkg-b/package.json",
+])
+
+ts_library(
+    name = "pkg_a_lib",
+    srcs = ["packages/pkg-a/index.ts"],
+)
+
+bun_bundle(
+    name = "pkg_b_bundle",
+    entry_points = ["packages/pkg-b/main.ts"],
+    deps = [":pkg_a_lib"],
+    target = "bun",
+)

examples/workspace/README.md

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+# workspace example
+
+Minimal Bun workspace-style layout with two packages:
+
+- `@workspace/pkg-a`: exports a string helper
+- `@workspace/pkg-b`: imports from `pkg-a` and prints the message
+
+The workspace root also defines a Bun `catalog` pin for `lodash`, and both packages consume it via `"lodash": "catalog:"` to keep versions consistent across packages.
+
+This example demonstrates building a target from a workspace-shaped directory tree with Bazel:
+
+```bash
+bazel build //examples/workspace:pkg_b_bundle
+```

examples/workspace/package.json

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+{
+  "name": "workspace-root",
+  "private": true,
+  "workspaces": [
+    "packages/*"
+  ],
+  "catalog": {
+    "lodash": "^4.17.21"
+  }
+}

examples/workspace/packages/pkg-a/index.ts

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+export function workspaceMessage(): string {
+  return "workspace-pkg-a";
+}

examples/workspace/packages/pkg-a/package.json

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+{
+  "name": "@workspace/pkg-a",
+  "version": "1.0.0",
+  "main": "index.ts",
+  "dependencies": {
+    "lodash": "catalog:"
+  }
+}

examples/workspace/packages/pkg-b/main.ts

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+import { workspaceMessage } from "../pkg-a/index";
+
+console.log(`hello-${workspaceMessage()}`);

examples/workspace/packages/pkg-b/package.json

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+{
+  "name": "@workspace/pkg-b",
+  "version": "1.0.0",
+  "dependencies": {
+    "@workspace/pkg-a": "workspace:*",
+    "lodash": "catalog:"
+  }
+}