diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 58ba66aa04..0ed4b23197 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -79,9 +79,12 @@ jobs:
       - uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4
         with:
           node-version: 22
+      - run: corepack enable
+      - run: corepack prepare pnpm@10.17.1 --activate
       - uses: ./.github/actions/prepare-ffmpeg-bin
       - run: bun install --frozen-lockfile
       - run: bun run build
+      - run: bun run verify:packed-manifests
 
   lint:
     name: Lint
diff --git a/package.json b/package.json
index 420e7831f6..33b4b16ce2 100644
--- a/package.json
+++ b/package.json
@@ -32,7 +32,7 @@
     "player:perf": "bun run --filter @hyperframes/player perf",
     "format:check": "oxfmt --check .",
     "knip": "knip",
-    "test:scripts": "node --import tsx --test scripts/validate-release-channel.test.mjs scripts/draft-changelog.test.ts scripts/set-version.test.ts scripts/release-prepare.test.ts scripts/cli-options.test.ts scripts/changelog-weekly.test.ts scripts/claude-plugin-compression.test.ts",
+    "test:scripts": "node --import tsx --test scripts/validate-release-channel.test.mjs scripts/draft-changelog.test.ts scripts/set-version.test.ts scripts/release-prepare.test.ts scripts/cli-options.test.ts scripts/changelog-weekly.test.ts scripts/claude-plugin-compression.test.ts scripts/verify-packed-manifests.test.mjs",
     "test:skills": "node --test 'skills/**/*.test.mjs'",
     "generate:previews": "tsx scripts/generate-template-previews.ts",
     "generate:catalog-previews": "tsx scripts/generate-catalog-previews.ts",
diff --git a/packages/core/package.json b/packages/core/package.json
index 1d88c4e0b9..643e67402a 100644
--- a/packages/core/package.json
+++ b/packages/core/package.json
@@ -13,7 +13,6 @@
     "dist/**/*.d.ts.map",
     "dist/**/*.js.map",
     "!dist/hyperframe.runtime.mjs",
-    "!dist/generated/runtime-inline.js",
     "docs",
     "schemas",
     "README.md"
diff --git a/scripts/verify-packed-manifests.mjs b/scripts/verify-packed-manifests.mjs
index d423ecc1e1..8fa0da0f5f 100644
--- a/scripts/verify-packed-manifests.mjs
+++ b/scripts/verify-packed-manifests.mjs
@@ -2,13 +2,15 @@
 
 import { execFileSync } from "node:child_process";
 import { existsSync, mkdtempSync, readdirSync, readFileSync, rmSync } from "node:fs";
-import { extname, join } from "node:path";
+import { extname, join, posix } from "node:path";
 import { tmpdir } from "node:os";
+import { fileURLToPath } from "node:url";
 
 const ROOT = join(import.meta.dirname, "..");
 const PACKAGES_DIR = join(ROOT, "packages");
 const DEP_FIELDS = ["dependencies", "devDependencies", "peerDependencies", "optionalDependencies"];
 const RUNTIME_IMPORT_EXTENSIONS = new Set([".js", ".mjs", ".cjs", ".json", ".wasm", ".node"]);
+const PACKED_JAVASCRIPT_FILE_PATTERN = /\.(?:js|mjs|cjs)$/;
 
 function listWorkspacePackageDirs() {
   return readdirSync(PACKAGES_DIR)
@@ -129,7 +131,9 @@ function hasExplicitRuntimeExtension(specifier) {
 function listRelativeImportSpecifiers(source) {
   const patterns = [
     /^\s*import\s+["'](\.\.?\/[^"']+)["']/gm,
-    /^\s*(?:import|export)\s+[^;]*?\s+from\s+["'](\.\.?\/[^"']+)["']/gm,
+    /^\s*(?:import|export)\b(?:(?!;)[\s\S])*?\s+from\s+["'](\.\.?\/[^"']+)["']/gm,
+    /\bimport\s*\(\s*["'](\.\.?\/[^"']+)["']\s*\)/gm,
+    /\brequire\s*\(\s*["'](\.\.?\/[^"']+)["']\s*\)/gm,
   ];
   const specifiers = [];
 
@@ -177,17 +181,28 @@ function verifyPackedEntrypoints(workspace, packedPackage, packedFiles) {
   }
 }
 
-function listJavaScriptImportIssues(filename, file) {
-  const source = readPackedFile(filename, file);
-  return listRelativeImportSpecifiers(source)
-    .filter(({ specifier }) => !hasExplicitRuntimeExtension(specifier))
-    .map(({ index, specifier }) => `${file}:${lineNumberAt(source, index)} imports ${specifier}`);
+function resolvePackedRelativeImport(fromFile, specifier) {
+  return posix.normalize(posix.join(posix.dirname(fromFile), stripSpecifierQuery(specifier)));
 }
 
-function listPackedJavaScriptImportIssues(filename, packedFiles) {
+export function listPackedJavaScriptImportIssues(filename, packedFiles) {
   return [...packedFiles]
-    .filter((file) => file.endsWith(".js"))
-    .flatMap((file) => listJavaScriptImportIssues(filename, file));
+    .filter((file) => PACKED_JAVASCRIPT_FILE_PATTERN.test(file))
+    .flatMap((file) => {
+      const source = readPackedFile(filename, file);
+      return listRelativeImportSpecifiers(source).flatMap(({ index, specifier }) => {
+        if (!hasExplicitRuntimeExtension(specifier)) {
+          return [`${file}:${lineNumberAt(source, index)} imports ${specifier}`];
+        }
+
+        const target = resolvePackedRelativeImport(file, specifier);
+        if (!packedFiles.has(target)) {
+          return [`${file}:${lineNumberAt(source, index)} imports missing ${specifier}`];
+        }
+
+        return [];
+      });
+    });
 }
 
 function verifyPackedJavaScriptImports(workspace, filename, packedFiles) {
@@ -276,4 +291,6 @@ function main() {
   listWorkspacePackageDirs().forEach(verifyWorkspace);
 }
 
-main();
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
+  main();
+}
diff --git a/scripts/verify-packed-manifests.test.mjs b/scripts/verify-packed-manifests.test.mjs
new file mode 100644
index 0000000000..3c5713a75b
--- /dev/null
+++ b/scripts/verify-packed-manifests.test.mjs
@@ -0,0 +1,100 @@
+import assert from "node:assert/strict";
+import { execFileSync } from "node:child_process";
+import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "node:fs";
+import { tmpdir } from "node:os";
+import { dirname, join } from "node:path";
+import { describe, it } from "node:test";
+import { listPackedJavaScriptImportIssues } from "./verify-packed-manifests.mjs";
+
+describe("packed manifest verifier", () => {
+  function withPackedFiles(files, packedFiles, callback) {
+    const dir = mkdtempSync(join(tmpdir(), "hyperframes-pack-test-"));
+    try {
+      const packageDir = join(dir, "package");
+      mkdirSync(packageDir, { recursive: true });
+      for (const [file, source] of Object.entries(files)) {
+        mkdirSync(dirname(join(packageDir, file)), { recursive: true });
+        writeFileSync(join(packageDir, file), source, "utf8");
+      }
+
+      const tarball = join(dir, "package.tgz");
+      execFileSync("tar", ["-czf", tarball, "-C", dir, "package"]);
+      callback(tarball, new Set(packedFiles));
+    } finally {
+      rmSync(dir, { recursive: true, force: true });
+    }
+  }
+
+  it("passes explicit relative JavaScript imports whose target is packed", () => {
+    withPackedFiles(
+      {
+        "dist/index.js": 'import { runtime } from "./generated/runtime-inline.js";\n',
+        "dist/generated/runtime-inline.js": "export const runtime = 'ok';\n",
+      },
+      ["dist/index.js", "dist/generated/runtime-inline.js"],
+      (tarball, packedFiles) => {
+        assert.deepEqual(listPackedJavaScriptImportIssues(tarball, packedFiles), []);
+      },
+    );
+  });
+
+  it("reports explicit relative JavaScript imports whose target is missing from the tarball", () => {
+    withPackedFiles(
+      {
+        "dist/index.js": 'import { runtime } from "./generated/runtime-inline.js";\n',
+      },
+      ["dist/index.js"],
+      (tarball, packedFiles) => {
+        assert.deepEqual(listPackedJavaScriptImportIssues(tarball, packedFiles), [
+          "dist/index.js:1 imports missing ./generated/runtime-inline.js",
+        ]);
+      },
+    );
+  });
+
+  it("checks export-from, dynamic import, require, and mjs/cjs files", () => {
+    withPackedFiles(
+      {
+        "dist/index.js": 'export * from "./generated/exports.js";\n',
+        "dist/dynamic.mjs": 'await import("./generated/dynamic.js");\n',
+        "dist/require.cjs": 'require("./generated/require.js");\n',
+      },
+      ["dist/index.js", "dist/dynamic.mjs", "dist/require.cjs"],
+      (tarball, packedFiles) => {
+        assert.deepEqual(listPackedJavaScriptImportIssues(tarball, packedFiles), [
+          "dist/index.js:1 imports missing ./generated/exports.js",
+          "dist/dynamic.mjs:1 imports missing ./generated/dynamic.js",
+          "dist/require.cjs:1 imports missing ./generated/require.js",
+        ]);
+      },
+    );
+  });
+
+  it("reports extensionless relative imports", () => {
+    withPackedFiles(
+      {
+        "dist/index.js": 'export {\n  runtime\n} from "./generated/runtime-inline";\n',
+      },
+      ["dist/index.js"],
+      (tarball, packedFiles) => {
+        assert.deepEqual(listPackedJavaScriptImportIssues(tarball, packedFiles), [
+          "dist/index.js:1 imports ./generated/runtime-inline",
+        ]);
+      },
+    );
+  });
+
+  it("reports side-effect imports whose target is missing from the tarball", () => {
+    withPackedFiles(
+      {
+        "index.js": 'import "./missing.js";\n',
+      },
+      ["index.js"],
+      (tarball, packedFiles) => {
+        assert.deepEqual(listPackedJavaScriptImportIssues(tarball, packedFiles), [
+          "index.js:1 imports missing ./missing.js",
+        ]);
+      },
+    );
+  });
+});