v0.3.0 — LlamaIndex and Haystack integrations

Added

• LlamaIndex integration: HTMLTableRescuerReader (extra: llamaindex). Each table becomes its own Document. Works as a file_extractor in SimpleDirectoryReader; extra_info passed by the framework takes precedence over the reader's own metadata.
• Haystack integration: HTMLTableRescuerConverter (extra: haystack). Unlike Haystack's own HTMLToDocument, one source yields one Document per table. Accepts file paths and ByteStreams, follows the Haystack convention of skipping unreadable sources with a warning instead of failing the pipeline, and supports to_dict/from_dict so a ParseConfig survives pipeline serialization. Compatible with both haystack-ai 2.x and 3.x.
• Test coverage for all framework integrations (26 tests); the LangChain loader was previously untested.

Full Changelog: v0.2.1...v0.3.0