Return the full markdown reference for a C++26 paper.

Args: paper_id: WG21 paper identifier (e.g. 'P2996', 'P2900').

Returns: The contents of corpus/references/.md, including the YAML frontmatter (id, title, revision, tier, keywords, canonical_url, …) and the prose body (problem, syntax, canonical example, pre-C++26 equivalent, gotchas, related).

Raises: FileNotFoundError when the paper is unknown to the index, or known but its reference markdown has not yet been authored.

Free-text search over the C++26 paper index.

Matches against title (weighted ×2), keywords, and category using rapidfuzz's WRatio scorer (a robust fuzzy match for short strings).

Args: query: free-text query, e.g. 'reflection', 'enum to string', 'contracts assert'. top_k: number of matches to return (default 5).

Returns: A list of dicts: {id, title, tier, category, score (0-100), path}. Empty list when the index is empty or the query is blank.

Look up compiler implementation status for a C++26 paper.

INFORMATIONAL ONLY. The cpp26-adapter suggestion path is compiler-agnostic by design — the model must not gate recommendations on this. Use it for classifying review diagnostics as bug-vs-compiler-lag, never for choosing which idiom to write.

Args: paper_id: WG21 paper id (e.g. 'P2996'). compiler: optional compiler key — 'clang-22', 'clang-p2996', 'gcc-16', 'msvc-19.40'. When omitted, returns status for every known compiler.

Returns: A dict containing at minimum {paper_id, informational_only: True}. For known entries: {support, note, version, ...} (schema depends on corpus/status.yaml). For unknown paper or compiler: {support: 'unknown', note: ...}.