Results are returned newest-first. Each result has a title, a short
summary, the publication date, the content language, the category and a
URL. Use get_article on a URL to read the full text.

The connector pages through the site automatically until it has `limit`
matching items or the archive is exhausted, so a larger `limit` simply
digs deeper into history.

This is the chronological feed of everything the press service publishes.
Combine with `since`/`until` to get all news in a date range, or with
`category` to follow only press releases, speeches, etc.

Use the returned category keys with the `category` parameter of
search_news / browse_latest_news.

Unlike search_news (exact keywords), this matches by meaning, so it handles
natural-language questions and wording that differs from the article. Each
result includes a `similarity` score in [0, 1].

Set `top_k` to control how many results come back (default 10). Requires the
index to have been built with build_semantic_index and an OPENROUTER_API_KEY
in the server environment. If the index is empty or the key is missing, the
response says so.

Pages through the most recent SIP news, embeds each item (title + summary)
via OpenRouter, and stores the vectors in a local ChromaDB collection. Safe
to run repeatedly: by default it only embeds items not already indexed. Run
it once before using semantic_search, and again periodically to pick up new
news. This call fetches from SIP and the embedding API, so it can take a
little while for large `max_items`.