ci(pacquet): scope the e2e run to the pnpm package only

Now that --no-runtime fixed the VM-modules loader, tests actually run.
The next failure mode was real: other workspace packages (e.g.
@pnpm/building.commands) shell out to pnpm in their tests, and
PNPM_E2E_BIN routes those calls through pacquet, which doesn't
implement every command they exercise. Add a dedicated
test-pkgs-pnpm script so the e2e job runs jest only in the pnpm
package and PNPM_E2E_BIN affects nothing else.

Written by an agent (Claude Code, claude-opus-4-7).

.github/workflows/pacquet-ci.yml

@@ -176,11 +176,13 @@ jobs:
           # auto-reinstalls before every script and seems to break jest's
           # VM-modules loader. test.yml disables it for the same reason.
           pnpm_config_verify_deps_before_run: false
-        # `pn run test-pkgs-all` matches the call shape test.yml uses (via
+        # Use the dedicated `test-pkgs-pnpm` script so PNPM_E2E_BIN only
-        # `ci:test-all`): the hidden `.test` invocation lives inside a
+        # affects the pnpm package's e2e suite — running every package's
-        # script-to-script chain, which is the only way pnpm allows it.
+        # `.test` would route their pnpm-driven assertions through pacquet
-        # Calling `pn -r .test` directly trips ERR_PNPM_HIDDEN_SCRIPT.
+        # too, which fails for commands pacquet doesn't implement.
-        run: pnpm run test-pkgs-all
+        # Going through a package.json script also keeps the hidden `.test`
+        # invocation inside a script chain (required by pnpm).
+        run: pnpm run test-pkgs-pnpm
 
   doc:
     name: Doc

package.json

@@ -14,6 +14,7 @@
     "ci:test-all": "pn prepare-fixtures && pn test-pkgs-all",
     "remove-temp-dir": "shx rm -rf ../pnpm_tmp",
     "test-pkgs-all": "pn remove-temp-dir && pn --no-sort --workspace-concurrency=1 -r .test",
+    "test-pkgs-pnpm": "pn remove-temp-dir && pn --filter=pnpm --workspace-concurrency=1 -r .test",
     "test-branch": "pn pretest && pn lint && git remote set-branches --add origin main && git fetch origin main && pn test-pkgs-branch",
     "ci:test-branch": "pn prepare-fixtures && pn test-pkgs-branch",
     "test-pkgs-branch": "pn remove-temp-dir && pn --workspace-concurrency=1 --filter=...[origin/main] --no-sort --if-present .test",