npm/jedi: Build pybricks-api from source.

Now that we use a single release pipeline, the API itself might not yet be on
PyPI by the time we build jedi, so we build it locally.

We'll still keep the API docs on PyPI so users can have local autocomplete,
but that path is no longer a dependency for building jedi.

Also explain CHANGELOG synchronization with firmware repo.

.github/workflows/publish-jedi.yml

@@ -30,11 +30,14 @@ jobs:
     - name: Set pybricks-jedi version
       run: poetry version "$VERSION"
       working-directory: jedi
+    - name: Set pybricks version and update jedi dependency pin
+      run: |
+        poetry version "$VERSION"
+        sed -i "s/^pybricks = \".*\"/pybricks = \"$VERSION\"/" jedi/pyproject.toml
     - uses: actions/setup-node@v4
       with:
         node-version: '24'
         registry-url: 'https://registry.npmjs.org'
-    - run: ./build.py "$NPM_VERSION"
-      working-directory: npm/jedi
+    - run: python jedi/build.py "$NPM_VERSION"
     - run: npm publish --tag "$NPM_TAG"
-      working-directory: npm/jedi/build
+      working-directory: jedi/npm-build