Add workflow to handle README-only PRs

Adds a GitHub Actions workflow that:
- Detects PRs that only modify README.md
- Comments explaining we no longer accept new server additions
- Directs contributors to the MCP registry instead
- Allows updates/removals via /i-promise-this-is-not-a-new-server
- Uses labels (readme: pending / readme: ready for review) for filtering
- Minimizes bot comment after confirmation to reduce clutter

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.github/workflows/readme-pr-check.yml

@@ -0,0 +1,109 @@
+name: README PR Check
+
+on:
+  pull_request:
+    types: [opened]
+    paths:
+      - 'README.md'
+  issue_comment:
+    types: [created]
+
+jobs:
+  check-readme-only:
+    if: github.event_name == 'pull_request'
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Check files and comment if README-only
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const prNumber = context.payload.pull_request.number;
+
+            const { data: files } = await github.rest.pulls.listFiles({ owner, repo, pull_number: prNumber });
+
+            if (files.length !== 1 || files[0].filename !== 'README.md') {
+              console.log('PR modifies files other than README, skipping');
+              return;
+            }
+
+            // Check if we've already commented
+            const { data: comments } = await github.rest.issues.listComments({ owner, repo, issue_number: prNumber });
+            if (comments.some(c => c.user.login === 'github-actions[bot]' && c.body.includes('no longer accepting PRs to add new servers'))) {
+              console.log('Already commented on this PR, skipping');
+              return;
+            }
+
+            await github.rest.issues.addLabels({ owner, repo, issue_number: prNumber, labels: ['readme: pending'] });
+
+            await github.rest.issues.createComment({
+              owner,
+              repo,
+              issue_number: prNumber,
+              body: `Thanks for your contribution!
+
+**We are no longer accepting PRs to add new servers to the README.** The server lists are deprecated and will eventually be removed entirely, replaced by the registry.
+
+👉 **To add a new MCP server:** Please publish it to the [MCP Server Registry](https://github.com/modelcontextprotocol/registry) instead. You can browse published servers at [registry.modelcontextprotocol.io](https://registry.modelcontextprotocol.io/).
+
+👉 **If this PR updates or removes an existing entry:** We do still accept these changes. Please reply with \`/i-promise-this-is-not-a-new-server\` to continue.
+
+If this PR is adding a new server, please close it and submit to the registry instead.`
+            });
+
+  handle-confirmation:
+    if: github.event_name == 'issue_comment' && github.event.issue.pull_request && contains(github.event.comment.body, '/i-promise-this-is-not-a-new-server')
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+    steps:
+      - name: Swap labels and minimize comments
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const { owner, repo } = context.repo;
+            const prNumber = context.payload.issue.number;
+
+            // Check if pending label exists
+            const { data: labels } = await github.rest.issues.listLabelsOnIssue({ owner, repo, issue_number: prNumber });
+            if (!labels.some(l => l.name === 'readme: pending')) {
+              console.log('No pending label found, skipping');
+              return;
+            }
+
+            // Swap labels
+            try {
+              await github.rest.issues.removeLabel({ owner, repo, issue_number: prNumber, name: 'readme: pending' });
+            } catch (e) {}
+            await github.rest.issues.addLabels({ owner, repo, issue_number: prNumber, labels: ['readme: ready for review'] });
+
+            // Find the bot's original comment
+            const { data: comments } = await github.rest.issues.listComments({ owner, repo, issue_number: prNumber });
+            const botComment = comments.find(c =>
+              c.user.login === 'github-actions[bot]' &&
+              c.body.includes('no longer accepting PRs to add new servers')
+            );
+
+            // Minimize both comments via GraphQL
+            const minimizeComment = async (nodeId) => {
+              await github.graphql(`
+                mutation($id: ID!) {
+                  minimizeComment(input: {subjectId: $id, classifier: RESOLVED}) {
+                    minimizedComment { isMinimized }
+                  }
+                }
+              `, { id: nodeId });
+            };
+
+            if (botComment) {
+              await minimizeComment(botComment.node_id);
+            }
+
+            // Only minimize user's comment if it's just the command
+            const userComment = context.payload.comment.body.trim();
+            if (userComment === '/i-promise-this-is-not-a-new-server') {
+              await minimizeComment(context.payload.comment.node_id);
+            }