ci: add standalone MCP registry publish workflow

Supports both workflow_dispatch for manual testing and workflow_call
for reuse from the release pipeline.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: luarss

.github/workflows/mcp-registry-publish.yml

@@ -0,0 +1,43 @@
+name: Publish to MCP Registry
+
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: Version to publish (e.g. 0.3.0)
+        required: true
+        type: string
+  workflow_call:
+    inputs:
+      version:
+        description: Version to publish (e.g. 0.3.0)
+        required: true
+        type: string
+
+jobs:
+  publish:
+    name: Publish to MCP Registry
+    runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install mcp-publisher
+        run: |
+          curl -L "https://github.com/modelcontextprotocol/registry/releases/latest/download/mcp-publisher_$(uname -s | tr '[:upper:]' '[:lower:]')_$(uname -m | sed 's/x86_64/amd64/;s/aarch64/arm64/').tar.gz" | tar xz mcp-publisher
+
+      - name: Authenticate to MCP Registry
+        run: ./mcp-publisher login github-oidc
+
+      - name: Install jq
+        run: sudo apt-get update -qq && sudo apt-get install -qq -y jq
+
+      - name: Update version in server.json
+        run: |
+          VERSION="${{ inputs.version }}"
+          jq --arg v "$VERSION" '.version = $v | (.packages[].version) = $v' server.json > server.json.tmp && mv server.json.tmp server.json
+
+      - name: Publish to MCP Registry
+        run: ./mcp-publisher publish