fix(ci): include README.md in hyperdb-mcp npm package (#12)

## Summary

- The `hyperdb-mcp` npm package publishes from `hyperdb-mcp/npm/` which
contains no `README.md` — npmjs.com renders a blank page
- Add a CI step to copy `hyperdb-mcp/README.md` into the publish
directory before `npm publish`
- Add `README.md` to the `files` array in `hyperdb-mcp/npm/package.json`

The `hyperdb-api-node` package already has its README in its publish
root so it's unaffected.

## Test plan

- [ ] Trigger npm-build-publish via workflow_dispatch and confirm the
publish succeeds
- [ ] After publish, verify https://www.npmjs.com/package/hyperdb-mcp
shows the README content

Author: StefanSteiner

.github/workflows/npm-build-publish.yml

@@ -263,6 +263,9 @@ jobs:
             done
           done
 
+      - name: Copy README into hyperdb-mcp npm publish directory
+        run: cp hyperdb-mcp/README.md hyperdb-mcp/npm/README.md
+
       - name: Determine npm dist-tag
         id: dist-tag
         run: |

hyperdb-mcp/npm/package.json

@@ -11,7 +11,8 @@
     "hyperdb-mcp-win32-x64-msvc": "0.1.1"
   },
   "files": [
-    "bin.js"
+    "bin.js",
+    "README.md"
   ],
   "keywords": [
     "hyper",