a package with no root entry point is not a broken install

`unresolvableDependencies` asked `Bun.resolveSync(name, pluginDir)` of every declared package. That is
the right question for almost all of them and unanswerable for a few.

`@tiptap/pm` declares no `main`, no `module`, and an `exports` map with no "." — it exists only as
subpaths. You import `@tiptap/pm/state`, never `@tiptap/pm`. Asked to resolve the bare name Bun
correctly says it cannot, and this read that as a failed install.

It cost a deploy. fofos-admin declares `@tiptap/pm` because tiptap needs it present; the install was
perfect — the directory, its dist and thirteen prosemirror packages all there — and the plugin was
reported as failed on every host that has it.

The strong check stays first, because it is the one that catches a package which installed but cannot
be loaded on this machine — `sharp` resolving to a platform-specific binary is the shape it was written
for. Only a package that fails it is asked the weaker question: is it there. Present-but-unimportable
still fails, since it never reaches the second line.

Verified on the host rather than reasoned about: of the five packages fofos-admin declares, four
resolve and @tiptap/pm alone does not, and it is present.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

src/servers/plugins/npm-deps.ts

@@ -181,12 +181,31 @@ const body = {
 export function unresolvableDependencies(plugin: DiscoveredPlugin): string[] {
   const names = Object.keys(plugin.manifest.npmDependencies ?? {});
   return names.filter((name) => {
+    // The strong check: it imports. This is what catches a package that installed but cannot be loaded
+    // on this machine — `sharp` resolving to a platform-specific binary is the shape it was written for.
     try {
       Bun.resolveSync(name, plugin.dir);
       return false;
     } catch {
-      return true;
+      // fall through
     }
+
+    /*
+      Some packages have NO root entry point, and that is not a fault.
+
+      `@tiptap/pm` declares no `main`, no `module`, and an `exports` map with no `"."` — it exists only as
+      subpaths, and you import `@tiptap/pm/state`, never `@tiptap/pm`. Asked to resolve the bare name,
+      Bun correctly says it cannot, and the check above read that as a broken install.
+
+      It cost a deploy: fofos-admin declares `@tiptap/pm` because tiptap needs it present, the install
+      was perfect — the directory, its dist and thirteen prosemirror packages all there — and the plugin
+      was reported as failed on every host that had it.
+
+      So a package that does not resolve is asked the weaker question instead: is it THERE. Present but
+      unimportable still fails, because the strong check ran first and only a package with no root entry
+      reaches this line.
+    */
+    return !existsSync(join(PLUGINS_DIR, 'node_modules', name, 'package.json'));
   });
 }