Add Schleswig-Holstein extraction case and three cleanup fixes

The GVOBl. Schl.-H. amendment act (Kommunalrecht, 2026/27) brings three
conventions the tool had not seen:

  * a running two-line page header that sits between articles and glued
    itself onto the following article heading,
  * superscript footnote markers on article headings ("Artikel 1 ¹)"),
    which defeated the article split, and
  * ragged-right typesetting, where the geometric margin detection finds
    no alignment cluster and reports full lines as hard line ends, so a
    trailing hyphen was never joined.

All three are fixed in TextBereiniger; the hyphen rule now trusts the
extractor's trailing-space signal over the geometric class.

A full acceptance test is not possible: the Schleswig-Holstein law portal
serves document bodies only through an authenticated API, and the last
freely archived consolidated Gemeindeordnung (14 Nov 2022) predates the
amended § 34a. The new test therefore covers everything up to and
including command recognition; the blocker is recorded in
Landesrecht-Beispiele.adoc.

219 tests green; Bund/Bayern/Sachsen/Niedersachsen figures unchanged.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Change-Id: I9b3ab8a756372504b51c4d410b491fded255da96

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