This is the primary workhorse for reading regulatory text. Returns
parsed clean text by default: heading, paragraphs and citations, plus
tables, notes, examples, images, pending_amendments and editorial_notes
when present. Tables, notes and examples are numbered, and a marker like
"[See table 1: ...]" sits in the paragraphs where each appears. [fn N]
marks a footnote reference. pending_amendments means eCFR links a
published amendment that may not be in effect yet. A subpart, part or
appendix request returns one object per section under 'sections', each
with its own section number and heading. Set raw_xml=True to get the
original XML instead.

Answers longer than about 60,000 characters come in pages: the reply
says page and total_pages, and page=2 (and so on) returns the rest.

Specify the narrowest scope possible to keep responses manageable:
- section='15.305' for a single FAR section
- subpart='15.3' for a subpart
- part='15' for an entire part (can be large)
- chapter='1' for an entire chapter (often >1 MB, avoid)
- appendix='Appendix A to Chapter 2' (with chapter='2') for a DFARS appendix

Date auto-resolves to the latest available if not provided. Do NOT use
today's date directly -- eCFR lags 1-2 business days and today often 404s.

Title 48 = FAR/DFARS. Chapter 1 = FAR (Parts 1-99), Chapter 2 = DFARS
(Parts 200-299). Other chapters = agency FAR supplements (GSAR, VAAR,
HSAR, etc.).

For DFARS clauses, use chapter='2' (e.g., section='252.227-7014').

part/subpart/section accept int or string. Common prefix mistakes like
section='FAR 15.305' or '48 CFR 15.305' are stripped automatically, and
trailing paragraph cites like section='15.305(a)(2)' resolve to the base
section '15.305'.