Add AGG, BayJG, GEG, ProdHaftG, and UWG sample data.

Five new datasets with provenance in SOURCES files:

* UWG: 3. UWGAendG (BGBl. 2026 I Nr. 43) in the new digital BGBl
  format, plus drafts.
* GEG: the 2023 "Heizungsgesetz" (BGBl. 2023 I Nr. 280, new format)
  and the pending GModG 2026 drafts.
* AGG: 2. AGGAendG drafts (RefE/RegE/BT-Drs 21/6178) -- the base XML
  predates the bill, so this dataset produces real diffs -- and the
  official BMJV synopsis as ground truth.
* ProdHaftG: product-liability modernization drafts (Artikel 1 is a
  replacement act, Artikel 2 amends the old law), with official
  synopsis.
* BayJG: Bavarian hunting-law amendment (GVBl. 2026 S. 113) -- state
  law is not yet supported by the tool; kept for future work.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Change-Id: I8c33b6a19178f73cece9c9da99c713009016e578
42 files changed
tree: 5c53b08a64f87f924f9d59c6feafde500fbb9427
  1. .mvn/
  2. src/
  3. .gitignore
  4. COPYING
  5. mvnw
  6. mvnw.cmd
  7. pom.xml
  8. README.adoc