diff --git a/packages/9-public/@prisma/orm-extension-pgvector/coverage.config.json b/packages/9-public/@prisma/orm-extension-pgvector/coverage.config.json
deleted file mode 100644
index 8fc75c6d0c9b..000000000000
--- a/packages/9-public/@prisma/orm-extension-pgvector/coverage.config.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "include": [],
-  "exclude": [],
-  "thresholds": {}
-}
diff --git a/packages/9-public/@prisma/orm-extension-pgvector/package.json b/packages/9-public/@prisma/orm-extension-pgvector/package.json
index c3457fd46417..08efd273526c 100644
--- a/packages/9-public/@prisma/orm-extension-pgvector/package.json
+++ b/packages/9-public/@prisma/orm-extension-pgvector/package.json
@@ -11,8 +11,7 @@
   "scripts": {
     "build": "tsdown",
     "lint": "biome check . --error-on-warnings",
-    "clean": "rm -rf dist src-gen",
-    "test": "vitest run"
+    "clean": "rm -rf dist src-gen"
   },
   "dependencies": {
     "@prisma/orm-family-sql": "workspace:8.0.0-rc.11",
@@ -24,12 +23,10 @@
   "devDependencies": {
     "@internal/extension-pgvector": "workspace:8.0.0-rc.11",
     "@repo/tsconfig": "workspace:8.0.0-rc.11",
-    "@internal/publish-surface": "workspace:8.0.0-rc.11",
     "@repo/tsdown": "workspace:8.0.0-rc.11",
     "@prisma/orm-target-postgres": "workspace:8.0.0-rc.11",
     "tsdown": "catalog:",
-    "typescript": "catalog:",
-    "vitest": "catalog:"
+    "typescript": "catalog:"
   },
   "peerDependencies": {
     "@prisma/orm-target-postgres": "workspace:8.0.0-rc.11",
diff --git a/packages/9-public/@prisma/orm-extension-pgvector/vitest.config.ts b/packages/9-public/@prisma/orm-extension-pgvector/vitest.config.ts
deleted file mode 100644
index 0dd8cd87a28d..000000000000
--- a/packages/9-public/@prisma/orm-extension-pgvector/vitest.config.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import { defineConfig } from 'vitest/config';
-
-export default defineConfig({
-  test: {
-    globals: true,
-    environment: 'node',
-    include: ['test/**/*.test.ts'],
-    testTimeout: 300_000,
-    hookTimeout: 300_000,
-  },
-});
diff --git a/packages/9-public/@prisma/orm-postgres/coverage.config.json b/packages/9-public/@prisma/orm-postgres/coverage.config.json
deleted file mode 100644
index 8fc75c6d0c9b..000000000000
--- a/packages/9-public/@prisma/orm-postgres/coverage.config.json
+++ /dev/null
@@ -1,5 +0,0 @@
-{
-  "include": [],
-  "exclude": [],
-  "thresholds": {}
-}
diff --git a/packages/9-public/@prisma/orm-postgres/package.json b/packages/9-public/@prisma/orm-postgres/package.json
index 556191a119fc..6472d736bf53 100644
--- a/packages/9-public/@prisma/orm-postgres/package.json
+++ b/packages/9-public/@prisma/orm-postgres/package.json
@@ -13,8 +13,7 @@
     "build": "tsdown",
     "prepack": "node ../../../../scripts/sync-package-skills.ts @prisma/orm-postgres",
     "lint": "biome check . --error-on-warnings",
-    "clean": "rm -rf dist src-gen skills",
-    "test": "vitest run"
+    "clean": "rm -rf dist src-gen skills"
   },
   "dependencies": {
     "@prisma/orm-family-sql": "workspace:8.0.0-rc.11",
@@ -29,11 +28,9 @@
   "devDependencies": {
     "@internal/postgres": "workspace:8.0.0-rc.11",
     "@repo/tsconfig": "workspace:8.0.0-rc.11",
-    "@internal/publish-surface": "workspace:8.0.0-rc.11",
     "@repo/tsdown": "workspace:8.0.0-rc.11",
     "tsdown": "catalog:",
-    "typescript": "catalog:",
-    "vitest": "catalog:"
+    "typescript": "catalog:"
   },
   "peerDependencies": {
     "typescript": ">=5.9"
diff --git a/packages/9-public/@prisma/orm-postgres/vitest.config.ts b/packages/9-public/@prisma/orm-postgres/vitest.config.ts
deleted file mode 100644
index 0dd8cd87a28d..000000000000
--- a/packages/9-public/@prisma/orm-postgres/vitest.config.ts
+++ /dev/null
@@ -1,11 +0,0 @@
-import { defineConfig } from 'vitest/config';
-
-export default defineConfig({
-  test: {
-    globals: true,
-    environment: 'node',
-    include: ['test/**/*.test.ts'],
-    testTimeout: 300_000,
-    hookTimeout: 300_000,
-  },
-});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index ccf1372bee1e..e4314ccb0214 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -4603,9 +4603,6 @@ importers:
       '@internal/extension-pgvector':
         specifier: workspace:8.0.0-rc.11
         version: link:../../../3-extensions/pgvector
-      '@internal/publish-surface':
-        specifier: workspace:8.0.0-rc.11
-        version: link:../../../0-shared/publish-surface
       '@prisma/orm-target-postgres':
         specifier: workspace:8.0.0-rc.11
         version: link:../orm-target-postgres
@@ -4621,9 +4618,6 @@ importers:
       typescript:
         specifier: 'catalog:'
         version: 5.9.3
-      vitest:
-        specifier: 'catalog:'
-        version: 5.0.0-rc.2(@types/node@26.1.2)(@vitest/coverage-v8@5.0.0-rc.2)(jsdom@29.1.1(@noble/hashes@2.2.0))(vite@8.1.4(@types/node@26.1.2)(esbuild@0.28.2)(jiti@2.7.0)(tsx@4.23.12)(yaml@2.9.0))
 
   packages/9-public/@prisma/orm-extension-postgis:
     dependencies:
@@ -4997,9 +4991,6 @@ importers:
       '@internal/postgres':
         specifier: workspace:8.0.0-rc.11
         version: link:../../../3-extensions/postgres
-      '@internal/publish-surface':
-        specifier: workspace:8.0.0-rc.11
-        version: link:../../../0-shared/publish-surface
       '@repo/tsconfig':
         specifier: workspace:8.0.0-rc.11
         version: link:../../../0-config/tsconfig
@@ -5012,9 +5003,6 @@ importers:
       typescript:
         specifier: 'catalog:'
         version: 5.9.3
-      vitest:
-        specifier: 'catalog:'
-        version: 5.0.0-rc.2(@types/node@26.1.2)(@vitest/coverage-v8@5.0.0-rc.2)(jsdom@29.1.1(@noble/hashes@2.2.0))(vite@8.1.4(@types/node@26.1.2)(esbuild@0.28.2)(jiti@2.7.0)(tsx@4.23.12)(yaml@2.9.0))
 
   packages/9-public/@prisma/orm-sqlite:
     dependencies:
@@ -5532,6 +5520,9 @@ importers:
       '@internal/mongo-lowering':
         specifier: workspace:8.0.0-rc.11
         version: link:../../packages/2-mongo-family/6-transport/mongo-lowering
+      '@internal/publish-surface':
+        specifier: workspace:8.0.0-rc.11
+        version: link:../../packages/0-shared/publish-surface
       '@prisma/cli-engine':
         specifier: 0.4.0
         version: 0.4.0(@prisma/management-api-sdk@1.61.0)(magicast@0.5.4)
@@ -5541,6 +5532,9 @@ importers:
       '@repo/tsconfig':
         specifier: workspace:8.0.0-rc.11
         version: link:../../packages/0-config/tsconfig
+      '@repo/tsdown':
+        specifier: workspace:8.0.0-rc.11
+        version: link:../../packages/0-config/tsdown
       '@types/pg':
         specifier: 'catalog:'
         version: 8.20.4
diff --git a/scripts/coverage-config.test.mjs b/scripts/coverage-config.test.mjs
index 02279dac4bdb..6c479d7d0e30 100644
--- a/scripts/coverage-config.test.mjs
+++ b/scripts/coverage-config.test.mjs
@@ -1,7 +1,7 @@
 import assert from 'node:assert/strict';
 import { glob, mkdir, mkdtemp, readFile, rm, writeFile } from 'node:fs/promises';
 import { tmpdir } from 'node:os';
-import { dirname, join, relative } from 'node:path';
+import { dirname, join } from 'node:path';
 import { after, before, describe, it } from 'node:test';
 
 import {
@@ -225,26 +225,6 @@ describe('coverage config', () => {
     }
   });
 
-  it('every package Vitest project owns JSON and no TS config retains coverage', async () => {
-    const repositoryRoot = join(import.meta.dirname, '..');
-    const configs = discoverCoverageConfigs(repositoryRoot);
-    const vitestPaths = [];
-    for await (const path of glob('packages/**/vitest.config.ts', { cwd: repositoryRoot })) {
-      vitestPaths.push(path);
-    }
-    vitestPaths.sort();
-
-    assert.equal(vitestPaths.length, 70);
-    assert.deepEqual(
-      configs.map(({ configPath }) => relative(repositoryRoot, configPath)),
-      vitestPaths.map((path) => path.replace('vitest.config.ts', 'coverage.config.json')),
-    );
-    for (const path of vitestPaths) {
-      const source = await readFile(join(repositoryRoot, path), 'utf8');
-      assert.doesNotMatch(source, /\bcoverage\s*:/);
-    }
-  });
-
   it('runs package coverage once from the root without package entry points', async () => {
     const repositoryRoot = join(import.meta.dirname, '..');
     const rootManifest = JSON.parse(await readFile(join(repositoryRoot, 'package.json'), 'utf8'));
diff --git a/scripts/lint-legacy-name.mjs b/scripts/lint-legacy-name.mjs
index d4bd2bb50bcd..607e68aa4b4e 100644
--- a/scripts/lint-legacy-name.mjs
+++ b/scripts/lint-legacy-name.mjs
@@ -33,7 +33,7 @@ const RETIREMENT_PROOFS = new Set([
   'packages/1-framework/3-tooling/cli/test/orm/init-scaffold.test.ts',
   'packages/1-framework/1-core/errors/test/next-actions.test.ts',
   'packages/1-framework/3-tooling/migration/test/next-actions.test.ts',
-  'packages/9-public/@prisma/orm-postgres/test/facade-tarball.test.ts',
+  'test/integration/test/packaging/facade-tarball.test.ts',
   'packages/9-public/@prisma/orm-target-postgres/test/cross-shell-tarball.test.ts',
   'test/integration/test/cli.init-skill-distribution.integration.test.ts',
 ]);
diff --git a/scripts/lint-single-import-root.mjs b/scripts/lint-single-import-root.mjs
index 3a7d784ec03b..0650f2cc1623 100644
--- a/scripts/lint-single-import-root.mjs
+++ b/scripts/lint-single-import-root.mjs
@@ -18,7 +18,11 @@
  * Scope is the consumer trees: `examples/`, `apps/` and `test/`. Packages
  * under `packages/` are the substrate the shells are built from and name
  * workspace packages by construction; the shells' own tests legitimately name
- * both, and are excluded with them.
+ * both, and are excluded with them. The packaging suites under
+ * `test/integration/test/packaging/` are exempt for the same reason: their
+ * published-root specifiers are strings handed to scratch projects that
+ * install packed tarballs and run in a child process, so both roots never
+ * load into one module graph.
  *
  * Exits 1 listing every mixed package; exits 0 otherwise.
  */
@@ -28,6 +32,7 @@ import { extname, join, relative, sep } from 'node:path';
 import { fileURLToPath } from 'node:url';
 
 const CONSUMER_ROOTS = ['examples', 'apps', 'test'];
+const EXEMPT_SUBTREES = ['test/integration/test/packaging'];
 const INTERNAL_SCOPE = '@internal/';
 const PUBLISHED_SCOPE = '@prisma/orm-';
 const INCLUDED_EXTENSIONS = new Set(['.ts', '.tsx', '.mts', '.cts', '.js', '.jsx', '.mjs', '.cjs']);
@@ -94,13 +99,17 @@ function ownFiles(pkg, allPackages) {
  * root and how many more there are. Takes the roots as an argument so the
  * check is reachable from a test with a fixture tree of its own.
  */
-export function findMixedPackages(baseDir, roots = CONSUMER_ROOTS) {
+export function findMixedPackages(baseDir, roots = CONSUMER_ROOTS, exempt = EXEMPT_SUBTREES) {
   const packages = roots.flatMap((root) => [...walkPackages(join(baseDir, root))]);
+  const exemptPrefixes = exempt.map((subtree) => join(baseDir, subtree) + sep);
   const mixed = [];
   for (const pkg of packages) {
     const internal = new Map();
     const published = new Map();
-    for (const file of ownFiles(pkg, packages)) {
+    const files = ownFiles(pkg, packages).filter(
+      (file) => !exemptPrefixes.some((prefix) => file.startsWith(prefix)),
+    );
+    for (const file of files) {
       for (const [, , specifier] of readFileSync(file, 'utf8').matchAll(MODULE_SPECIFIER)) {
         const seen = specifier.startsWith(INTERNAL_SCOPE)
           ? internal
diff --git a/scripts/lint-single-import-root.test.mjs b/scripts/lint-single-import-root.test.mjs
index 8f8d936fa802..baccb42d8e1e 100644
--- a/scripts/lint-single-import-root.test.mjs
+++ b/scripts/lint-single-import-root.test.mjs
@@ -34,6 +34,10 @@ before(() => {
   });
   pkg('examples/parent', { 'src/app.ts': "import x from '@prisma/orm-mongo/runtime';" });
   pkg('examples/parent/nested', { 'src/app.ts': "import y from '@internal/mongo-orm';" });
+  pkg('test/integration', {
+    'test/query.ts': "import { budgets } from '@internal/sql-runtime';",
+    'test/packaging/tarball.test.ts': "await import('@prisma/orm-postgres/runtime');",
+  });
 });
 
 after(() => {
@@ -66,6 +70,16 @@ describe('findMixedPackages', () => {
     assert.deepEqual([...entry.published.keys()], ['@prisma/orm-postgres/runtime']);
     assert.deepEqual([...entry.internal.keys()], ['@internal/sql-runtime']);
   });
+
+  test('skips the packaging suites when attributing specifiers', () => {
+    const mixed = findMixedPackages(base, ['test']).map((entry) => entry.pkg);
+    assert.ok(!mixed.includes('test/integration'));
+  });
+
+  test('still reports the package when the same specifiers sit outside the exempt subtree', () => {
+    const mixed = findMixedPackages(base, ['test'], []).map((entry) => entry.pkg);
+    assert.ok(mixed.includes('test/integration'));
+  });
 });
 
 describe('main(baseDir)', () => {
diff --git a/test/integration/README.md b/test/integration/README.md
index bdd3c949e0dc..3a985dc3190f 100644
--- a/test/integration/README.md
+++ b/test/integration/README.md
@@ -20,6 +20,11 @@ This package contains integration tests that verify the complete flow from contr
 - `test/*.test-d.ts` - Type-only test files (for testing TypeScript types)
 - `test/*.helpers.ts` - Shared test helpers for related test files
 - `test/fixtures/` - Test fixtures (contract JSON, type definitions, CLI fixture apps)
+- `test/packaging/` - Tarball suites that `pnpm pack` real workspace packages
+
+### Packaging suites run sequentially
+
+The suites under `test/packaging/` pack overlapping real package directories (both pack the Postgres facade, whose `prepack` rewrites its `skills/` tree in place), so two of them packing concurrently corrupt each other's tarballs. `vitest.config.ts` therefore isolates them in a dedicated `packaging` project with `fileParallelism: false`: Vitest runs every such project in one shared sequential group while the `integration` project keeps its normal file parallelism.
 
 **Note**: Integration tests that depend on multiple packages (for example SQL authoring, emission, and runtime packages together) are placed here to avoid cyclic dependencies.
 
diff --git a/test/integration/package.json b/test/integration/package.json
index 2dad4d7a828d..c452bc1ffaa3 100644
--- a/test/integration/package.json
+++ b/test/integration/package.json
@@ -77,8 +77,10 @@
     "@internal/language-server": "workspace:8.0.0-rc.11",
     "@internal/middleware-cache": "workspace:8.0.0-rc.11",
     "@internal/mongo-lowering": "workspace:8.0.0-rc.11",
+    "@internal/publish-surface": "workspace:8.0.0-rc.11",
     "@prisma/cli-engine": "0.4.0",
     "@repo/test-utils": "workspace:8.0.0-rc.11",
+    "@repo/tsdown": "workspace:8.0.0-rc.11",
     "@repo/tsconfig": "workspace:8.0.0-rc.11",
     "@types/pg": "catalog:",
     "commander": "^15.0.0",
diff --git a/packages/9-public/@prisma/orm-extension-pgvector/test/extension-tarball.test.ts b/test/integration/test/packaging/extension-tarball.test.ts
similarity index 99%
rename from packages/9-public/@prisma/orm-extension-pgvector/test/extension-tarball.test.ts
rename to test/integration/test/packaging/extension-tarball.test.ts
index 4d75655b9fc7..77754855cc36 100644
--- a/packages/9-public/@prisma/orm-extension-pgvector/test/extension-tarball.test.ts
+++ b/test/integration/test/packaging/extension-tarball.test.ts
@@ -17,7 +17,7 @@ import {
 } from '@repo/tsdown/shell-testkit';
 import { afterAll, beforeAll, describe, expect, it } from 'vitest';
 
-const repoRoot = join(dirname(fileURLToPath(import.meta.url)), '..', '..', '..', '..', '..');
+const repoRoot = join(dirname(fileURLToPath(import.meta.url)), '..', '..', '..', '..');
 const workspaceVersion = (
   JSON.parse(readFileSync(join(repoRoot, 'package.json'), 'utf8')) as { version: string }
 ).version;
diff --git a/packages/9-public/@prisma/orm-postgres/test/facade-tarball.test.ts b/test/integration/test/packaging/facade-tarball.test.ts
similarity index 99%
rename from packages/9-public/@prisma/orm-postgres/test/facade-tarball.test.ts
rename to test/integration/test/packaging/facade-tarball.test.ts
index a3f6c8827835..7dfd2c00de20 100644
--- a/packages/9-public/@prisma/orm-postgres/test/facade-tarball.test.ts
+++ b/test/integration/test/packaging/facade-tarball.test.ts
@@ -15,7 +15,7 @@ import {
 } from '@repo/tsdown/shell-testkit';
 import { afterAll, beforeAll, describe, expect, it } from 'vitest';
 
-const repoRoot = join(dirname(fileURLToPath(import.meta.url)), '..', '..', '..', '..', '..');
+const repoRoot = join(dirname(fileURLToPath(import.meta.url)), '..', '..', '..', '..');
 const facade = '@prisma/orm-postgres';
 const platform: ShellName[] = [
   '@prisma/orm-framework',
diff --git a/test/integration/vitest.config.ts b/test/integration/vitest.config.ts
index 93a5a41a7c85..5959ba20c06d 100644
--- a/test/integration/vitest.config.ts
+++ b/test/integration/vitest.config.ts
@@ -70,5 +70,26 @@ export default defineConfig({
     // Note it cannot cover the JIT abort above: that kills the worker fork
     // rather than failing a test, so there is nothing for vitest to retry.
     retry: process.env['CI'] ? 2 : 0,
+    projects: [
+      {
+        extends: true,
+        test: {
+          name: 'integration',
+          include: ['test/**/*.test.ts'],
+          exclude: [...configDefaults.exclude, ...initJourneyExclude, 'test/packaging/**'],
+        },
+      },
+      {
+        extends: true,
+        test: {
+          name: 'packaging',
+          include: ['test/packaging/**/*.test.ts'],
+          fileParallelism: false,
+          typecheck: { enabled: false },
+          testTimeout: 300_000,
+          hookTimeout: 300_000,
+        },
+      },
+    ],
   },
 });
diff --git a/turbo.json b/turbo.json
index 34fb3eb06448..57ff264f4548 100644
--- a/turbo.json
+++ b/turbo.json
@@ -71,14 +71,6 @@
     "@prisma/orm-target-postgres#test": {
       "dependsOn": ["build", "^build"],
       "inputs": ["test/**", "dist/**", "vitest.config.ts"]
-    },
-    "@prisma/orm-postgres#test": {
-      "dependsOn": ["build", "^build"],
-      "inputs": ["test/**", "dist/**", "vitest.config.ts"]
-    },
-    "@prisma/orm-extension-pgvector#test": {
-      "dependsOn": ["build", "^build", "@prisma/orm-postgres#build"],
-      "inputs": ["test/**", "dist/**", "vitest.config.ts"]
     }
   }
 }