Add superpowers plugin to marketplace

This plugin teaches Claude brainstorming, subagent driven development
with built in code review, systematic debugging, and red/green TDD.
Additionally, it teaches Claude how to author and test new skills.

.claude-plugin/marketplace.json

@@ -512,6 +512,16 @@
         "url": "https://github.com/pinecone-io/pinecone-claude-code-plugin.git"
       },
       "homepage": "https://github.com/pinecone-io/pinecone-claude-code-plugin"
+    },
+    {
+      "name": "superpowers",
+      "description": "Superpowers teaches Claude brainstorming, subagent driven development with built in code review, systematic debugging, and red/green TDD. Additionally, it teaches Claude how to author and test new skills.",
+      "category": "development",
+      "source": {
+        "source": "url",
+        "url": "https://github.com/obra/superpowers.git"
+      },
+      "homepage": "https://github.com/obra/superpowers"
     }
   ]
 }

.github/workflows/close-external-prs.yml

@@ -13,35 +13,35 @@ jobs:
     if: vars.DISABLE_EXTERNAL_PR_CHECK != 'true'
     runs-on: ubuntu-latest
     steps:
-      - name: Check if author has write access
+      - name: Check if author is org member
         uses: actions/github-script@v7
         with:
           script: |
+            const org = 'anthropics';
             const author = context.payload.pull_request.user.login;
 
-            const { data } = await github.rest.repos.getCollaboratorPermissionLevel({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              username: author
-            });
+            try {
+              await github.rest.orgs.checkMembershipForUser({
+                org: org,
+                username: author
+              });
+              console.log(`${author} is an org member, allowing PR`);
+            } catch (e) {
+              if (e.status === 404) {
+                await github.rest.issues.createComment({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  issue_number: context.payload.pull_request.number,
+                  body: `Thanks for your interest! This repo only accepts contributions from Anthropic team members. If you'd like to submit a plugin to the marketplace, please submit your plugin [here](https://docs.google.com/forms/d/e/1FAIpQLSdeFthxvjOXUjxg1i3KrOOkEPDJtn71XC-KjmQlxNP63xYydg/viewform).`
+                });
 
-            if (['admin', 'write'].includes(data.permission)) {
-              console.log(`${author} has ${data.permission} access, allowing PR`);
-              return;
+                await github.rest.pulls.update({
+                  owner: context.repo.owner,
+                  repo: context.repo.repo,
+                  pull_number: context.payload.pull_request.number,
+                  state: 'closed'
+                });
+
+                console.log(`Closed PR from external contributor: ${author}`);
+              }
             }
-
-            console.log(`${author} has ${data.permission} access, closing PR`);
-
-            await github.rest.issues.createComment({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              issue_number: context.payload.pull_request.number,
-              body: `Thanks for your interest! This repo only accepts contributions from Anthropic team members. If you'd like to submit a plugin to the marketplace, please submit your plugin [here](https://docs.google.com/forms/d/e/1FAIpQLSdeFthxvjOXUjxg1i3KrOOkEPDJtn71XC-KjmQlxNP63xYydg/viewform).`
-            });
-
-            await github.rest.pulls.update({
-              owner: context.repo.owner,
-              repo: context.repo.repo,
-              pull_number: context.payload.pull_request.number,
-              state: 'closed'
-            });