Release v0.11.0

Summary

Minor release that pulls in upstream oxidize-pdf v2.16.3 and wires its new
experimental Analysis SPI into the Python bridge, enriches RagChunk
metadata, adds document-source stamping, and switches the native extension to a
single abi3 (stable ABI) wheel.

Upstream 2.16.x exposes a Service Provider Interface (SPI) that lets a consumer
plug in custom chunking, classification, and metadata-enrichment logic without
forking the MIT core. This release surfaces that surface in
oxidize_pdf.experimental (semver-exempt, matching the upstream contract), plus
the always-on metadata that the new pipeline produces. It is a non-breaking,
additive change at the stable API level — every previously callable method
preserves its signature.

Upstream

• oxidize-pdf =2.15.0 → =2.16.3. Pinned exact equality preserved.
  Added the unstable-spi feature alongside the existing set (compression, signatures, semantic, language-detection, default-features = false).
• 2.16.0 introduced the experimental Analysis SPI and the enriched RagChunk
  metadata. 2.16.1–2.16.3 are bug fixes only (xref-stream double-decode #341,
  bounded-memory lenient parse #339, deterministic extraction/XMP #329/#331/#334)
  inherited transparently with no bridge API change.

Added

Experimental Analysis SPI (oxidize_pdf.experimental, semver-exempt)

Plug custom analysis logic into RAG chunk generation:

• AnalysisPipeline builder: with_chunking, with_classifier, with_enricher,
  with_source, with_max_tokens.
• PdfReader.rag_chunks_with_pipeline(pipeline) runs the configured pipeline.
• Support types: ChunkGroup, ClassLabel (compares against str),
  ClassifyContext, EnrichContext, Element (with a class_label getter so a
  strategy can read classifier labels), DocumentSource.
• runtime_checkable Protocols ChunkingStrategy, ElementClassifier,
  MetadataEnricher document the callback shapes a provider must implement.

The module name signals that this surface may change between releases (same
semver-exempt contract as the upstream unstable-spi feature).

Enriched RagChunk metadata (always on, not SPI)

21 new getters on RagChunk: heading_path, dominant_font[_size],
is_bold/is_italic, min_confidence, content_types (ContentTypeFlags),
char/word/sentence_count, language/language_confidence/language_reliable
(ISO 639-3), chunk_id chain, page_span, page_regions (PageRegion with
ElementBBox), table_rows/table_cols, source (DocumentSource), extra.

Document-source stamping

• DocumentSource(filename=..., doc_hash=...).
• PdfReader.rag_chunks_with_source[_and_config] — auto-fills
  title/author/creation_date/total_pages from the document info dict.

Build & Packaging

Single abi3 wheel (stable ABI)

The native extension now builds against PyO3's abi3-py310 (Python limited API):

• One cp310-abi3 wheel per platform covers Python ≥ 3.10 instead of a wheel
  per minor version.
• Fixes the Windows / Python 3.13 link failure (LNK1181: cannot open input file 'python313.lib') seen after windows-latest rotated to the VS 18 / MSVC
  14.51 image whose Python 3.13.13 toolcache omits the version-specific import
  library. abi3 links against the always-present python3.lib forwarder instead.
• Verified: full CI matrix (3.10–3.13 × ubuntu/macos/windows) green; 2281 tests pass.

Breaking Changes

None. All stable-API method signatures are preserved. The experimental module is
explicitly semver-exempt.