ragnar 0.2.1

• ragnar_register_tool_retrieve() now registers a tool that will not return
  previously returned chunks, enabling the LLM to perform deeper searches of
  a ragnar store with repeated tool calls (#106).

• Updates for ellmer v0.3.0 and duckdb v1.3.1 (#99)

• Improved docs and error message in ragnar_store_insert() (@mattwarkentin, #88)

• ragnar_find_links() can now parse sitemap.xml files. It also gains a
  validate argument, allowing for sending a HEAD request to each link and
  filtering out broken links (#83).

• ragnar_inspector() now renders all urls as clickable links in the chunk markdown
  viewer, even if url is not a formal markdown link (#82).

• Before running examples and tests we now check if ragnar can load DuckDB extensions.
  This fixes issues in environments where DuckDB pre-built binaries for extensions are not
  compatible with the installed DuckDB version (#94).

• Added embed_lm_studio to use LMStudio as an embedding provider (#100).

• Fixed a bug causing ragnar_retrieve() to fail when documents were inserted without
  an origin (#102).

• We now suppress a "Couldn't find ffmpeg or avconv" warning when importing markitdown when
  using read_as_markdown(). The warning would only be relevant for users doing
  audio transcription (#103).

• Added embed_google_gemini to use Google Gemini API as an embedding provider (#105).