fix(test): the protobufjs security floor was asserted against an empty object (reads like a deleted pin; it moved) (#3035)

`scripts/__tests__` has **seven** files failing on main. None are in the
merge gate, so nobody is blocked — which is exactly how this survived.
This fixes the one that names a real risk.

## It reads like a deleted security pin. It isn't.

```
AssertionError: package.json pnpm.overrides: protobufjs range undefined
                must include an explicit semver version
```

#2220 moved pnpm overrides from `package.json` to `pnpm-workspace.yaml`
for pnpm 11 readiness. The assertion kept reading `package.json`, where
`pnpm.overrides` is now `{}`.

**Nothing was ever exposed**: `pnpm-workspace.yaml` still pins
`protobufjs: ^7.5.8` and the lockfile resolves `7.6.5`, comfortably
above the 7.5.5 floor. The sibling assertion that checks lockfile
resolutions has been passing the whole time — which is the only reason
this was survivable.

But no reader could distinguish this message from a genuinely removed
pin without doing the archaeology, and a guard that is permanently red
while naming a real risk teaches its readers that red means nothing
here. That is worse than no guard: it launders a real removal into
background noise.

## Measured both ways

| change to `pnpm-workspace.yaml` | result |
|---|---|
| pin removed | **fails** — `protobufjs range undefined must include an
explicit semver version` |
| pin lowered to `^7.4.0` | **fails** — `range ^7.4.0 is below required
floor 7.5.5` |
| unchanged | passes |

## Second assertion

`package.json` must declare **no** `pnpm.overrides`. If overrides move
again — or come back — that fails and points at the next reader, instead
of letting the floor go silently unchecked. That is precisely the
failure mode #2220 produced, and nothing would otherwise catch a second
occurrence.

## The other six

Left alone deliberately; each needs its own diagnosis and they are
unrelated to one another (I checked — the "seven files, one failure
each" pattern looked like a common cause and is not):

- `workflow-reliability-release-check` — manifest references
`workflow-definition-store.test.ts`, which no longer exists. **Likely a
real signal**: a release check pointing at a deleted seam file covers
nothing. Best next one to pick up.
- `ci-test-shard-timings` — snapshot references missing test files;
affects shard balancing.
- `verify-fast`, `engine-vitest-gate-policy` — validator/canary list
drift.
- `plugin-authoring-docs` — a TOC anchor for a heading containing `&`.
- `release-prompt-gate` — dry-run no longer exits before the proceed
confirmation.

## Verification

`node --test scripts/__tests__/dependency-security-floor.test.mjs` **4
passed** · `pnpm test:gate` 161 + 13 + 487 + 71 · lint · changesets —
green.


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Bug Fixes**
* Updated security validation to correctly read protobufjs version
overrides from the workspace configuration.
* Added safeguards to detect outdated override locations and help
prevent future security-check regressions.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

.changeset/security-floor-guard-follows-overrides.md

@@ -0,0 +1,7 @@
+---
+"@runfusion/fusion": patch
+---
+
+summary: Internal test fix; no user-visible change.
+category: internal
+dev: The protobufjs security-floor assertion now reads `pnpm-workspace.yaml`, where #2220 moved pnpm overrides, instead of the empty `package.json` block.

scripts/__tests__/dependency-security-floor.test.mjs

@@ -73,9 +73,41 @@ test("source manifests keep vulnerable dependency floors out", async () => {
   }
 });
 
+/*
+FNXC:DependencySecurity 2026-07-31-11:20:
+The override moved; the guard did not follow it.
+
+#2220 relocated pnpm overrides from `package.json` to `pnpm-workspace.yaml` for pnpm 11, and this
+assertion kept reading `package.json`. It has been failing ever since, on a non-blocking lane, saying
+"protobufjs range undefined" — which reads exactly like the security floor was DELETED. It was not:
+`pnpm-workspace.yaml` still pins `^7.5.8` and the lockfile resolves 7.6.5.
+
+That is the expensive kind of stale test. A red guard that names a real risk teaches its readers that
+red means nothing here, and the next reader cannot tell this from an actual removed pin without
+doing the archaeology. Read the file the overrides actually live in, so removing the pin fails again.
+*/
 test("pnpm overrides pin transitive protobufjs to a safe floor", async () => {
-  const manifest = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
-  assertRangeMeetsFloor({ location: "package.json pnpm.overrides", name: "protobufjs", range: manifest.pnpm?.overrides?.protobufjs, minimum: "7.5.5" });
+  const workspace = YAML.parse(await readFile(path.join(root, "pnpm-workspace.yaml"), "utf8"));
+  assertRangeMeetsFloor({
+    location: "pnpm-workspace.yaml overrides",
+    name: "protobufjs",
+    range: workspace?.overrides?.protobufjs,
+    minimum: "7.5.5",
+  });
+});
+
+test("the protobufjs floor is asserted where overrides actually live", async () => {
+  /*
+  The guard above is only meaningful while `pnpm-workspace.yaml` is the overrides home. If they move
+  again, this fails and points at the next reader rather than letting the floor go unchecked in
+  silence — the failure mode #2220 produced.
+  */
+  const rootManifest = JSON.parse(await readFile(path.join(root, "package.json"), "utf8"));
+  assert.equal(
+    Object.keys(rootManifest.pnpm?.overrides ?? {}).length,
+    0,
+    "package.json declares pnpm.overrides again — point the floor assertion above at it, or at both",
+  );
 });
 
 test("lockfile resolutions satisfy dependency security floors", async () => {