ragnar 0.3.0

Breaking changes

• In ragnar_find_links(), the default children_only = FALSE now
  returns all links on a page. If you relied on the previous default,
  set children_only = TRUE (#115).

• ragnar_register_tool_retrieve() now uses search_{store@name} as
  the default tool name prefix (instead of
  rag_retrieve_from_{store@name}), so you may need to update any
  code that refers to the tool name explicitly (#123, #127).

New features

• New embed_azure_openai() supports embeddings from Azure AI Foundry
  (#144).

• New embed_snowflake() supports embeddings via the Snowflake Cortex
  Embedding API (#148).

• New mcp_serve_store() lets local MCP clients (e.g. Codex CLI or
  Claude Code) search a RagnarStore (#123).

• ragnar_retrieve() (and the corresponding ellmer retrieval tool)
  now accepts a vector of queries (#150).

• New ragnar_store_atlas() visualizes store embeddings (#124).

• New ragnar_store_ingest() prepares documents in parallel with
  mirai and inserts them into a store (#133).

Minor improvements and fixes

• embed_ollama() now defaults to the embeddinggemma model (#121).

• embed_openai() error messages are now surfaced to the user (#112).

• Embedding helpers now share a generalized request retry policy,
  configurable via options(ragnar.embed.req_retry = ...) (#138).

• ragnar now requires mirai >= 2.5.1 (#139).

• print() on a RagnarStore now shows the store location (#116).

• ragnar_retrieve_bm25() now orders results by descending score
  (#122).

• ragnar_retrieve() no longer returns duplicate rows when called
  with multiple queries (#153).

• The ellmer retrieval tool now omits score columns from its output
  (#130).

• ragnar_store_inspect() now includes keyboard shortcuts, a
  draggable divider, improved preview linkification, better metadata
  display, and other UI tweaks (#120, #117, #118).

• ragnar_find_links() works better with local HTML files (#115).

• ragnar_store_insert() and ragnar_store_update() (v2 stores) now
  handle stores that are missing store@schema metadata (#146).

• read_as_markdown() once again fetches YouTube transcripts and now
  supports youtube_transcript_formatter, so you can add timestamps
  or links to the transcript output (#149).

• read_as_markdown() gains an origin argument to customize the
  @origin recorded on returned documents (#128).

• read_as_markdown() now correctly reads plain-text files with
  non-ASCII characters (#151).

• Vignette heading levels were fixed (#129).

• Added an example using sentence-transformers embeddings (#131).