diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 633b8a0166d..658c5eb6ee8 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -197,6 +197,12 @@ jobs:
             pnpm-lock.yaml
             mobile/pnpm-lock.yaml
 
+      - name: Set up Bun for localization checks
+        if: needs.code_paths.outputs.static_analysis == 'true'
+        uses: oven-sh/setup-bun@0c5077e51419868618aeaa5fe8019c62421857d6 # v2.2.0
+        with:
+          bun-version-file: config/bun-version
+
       # Keep each check in its own log while sharing this runner.
       - name: Lint
         if: '!cancelled()'
diff --git a/config/scripts/pr-preflight-gates.test.mjs b/config/scripts/pr-preflight-gates.test.mjs
index 7ba8a881d8f..37b2b923081 100644
--- a/config/scripts/pr-preflight-gates.test.mjs
+++ b/config/scripts/pr-preflight-gates.test.mjs
@@ -183,6 +183,7 @@ it('pins every foreground and background step to its selected phase', () => {
     (step) => !step.background && /outputs\.(static_analysis|typecheck)/.test(step.if ?? '')
   )
   expect(foreground.map((step) => [step.name ?? step.run ?? step.uses, step.if])).toEqual([
+    ['Set up Bun for localization checks', staticPhase],
     ['Reject low-evidence patterns', staticPhase],
     ['Enforce type-aware code-quality baseline', staticPhase],
     [
diff --git a/config/scripts/verify-localization-catalogs.test.mjs b/config/scripts/verify-localization-catalogs.test.mjs
index 038bf34254e..d83eaf1dcff 100644
--- a/config/scripts/verify-localization-catalogs.test.mjs
+++ b/config/scripts/verify-localization-catalogs.test.mjs
@@ -1,7 +1,8 @@
 import { mkdtemp, mkdir, rm, writeFile } from 'node:fs/promises'
 import { tmpdir } from 'node:os'
-import { join } from 'node:path'
+import { join, resolve } from 'node:path'
 import { afterEach, describe, expect, it } from 'vitest'
+import { runProcessSync } from './script-child-process.mjs'
 import { main as verifyTogether } from './verify-localization-catalogs.mjs'
 import { main as verifyCatalog } from './verify-localization-catalog.mjs'
 import { main as verifyRuntimeCatalog } from './generate-runtime-required-english-catalog.mjs'
@@ -31,6 +32,38 @@ afterEach(async () => {
 })
 
 describe('combined localization verification', () => {
+  it.each([
+    ['valid catalogs', undefined, undefined, 0],
+    ['missing reference', `${renderer}/greeting.ts`, "translate('missing', 'Missing')", 1],
+    ['missing runtime entry', runtimePath, '{}', 1]
+  ])(
+    'runs the real CLI with the same Node and Bun verdict: %s',
+    async (_name, file, contents, code) => {
+      const root = await fixture()
+      if (file) {
+        await writeFile(join(root, file), contents)
+      }
+      const results = []
+      for (const program of [process.execPath, 'bun']) {
+        const result = runProcessSync({
+          program,
+          args: [resolve(import.meta.dirname, 'verify-localization-catalogs.mjs')],
+          cwd: root,
+          env: { ...process.env, ORCA_BACKGROUND_LAUNCH: '1' },
+          timeoutMs: 10000
+        })
+        expect(result.code, result.stderr).toBe(code)
+        expect(result.timedOut).toBe(false)
+        results.push({ stdout: result.stdout, stderr: result.stderr })
+      }
+      expect(results[1].stdout.split('\n').sort()).toEqual(results[0].stdout.split('\n').sort())
+      expect(results[1].stderr.split('\n').sort()).toEqual(results[0].stderr.split('\n').sort())
+      expect(`${results[0].stdout}${results[0].stderr}`).toContain(
+        code === 0 ? 'Verified 2 localization key references' : 'Run `pnpm run sync:localization'
+      )
+    }
+  )
+
   it.each([
     ['valid catalogs', undefined, undefined, 0, 0],
     ['missing reference', `${renderer}/greeting.ts`, "translate('missing', 'Missing')", 1, 1],
diff --git a/package.json b/package.json
index 3a9c39ca92f..87db822a98f 100644
--- a/package.json
+++ b/package.json
@@ -87,7 +87,7 @@
     "verify:cli-bin": "node config/scripts/verify-cli-bin.mjs",
     "verify:built-skills-cli": "node config/scripts/verify-skills-cli-runtime.cjs out",
     "verify:renderer-boot-graph": "node config/scripts/verify-renderer-boot-graph.mjs",
-    "verify:localization-catalogs": "node config/scripts/verify-localization-catalogs.mjs",
+    "verify:localization-catalogs": "bun config/scripts/verify-localization-catalogs.mjs",
     "verify:localization-catalog": "node config/scripts/verify-localization-catalog.mjs",
     "sync:localization-catalog": "node config/scripts/verify-localization-catalog.mjs --fix",
     "verify:localization-runtime-catalog": "node config/scripts/generate-runtime-required-english-catalog.mjs",