Stabilize dependencies and wikitext tests with bundled fixtures

[Copilot]

The project was failing on a fresh clone due to an incompatible dependency and tests referencing missing wiki dump files. This change makes tests self-contained while keeping behavior coverage intact.

• Dependency reliability

  • Update funcparserlib to a Python 3.12-compatible version to unblock installs.

• Test fixture normalization

  • Replace missing data/raw/reduced/*.xml dependencies with bundled tests/wikitext/anarchism.txt.
  • Add a minimal synthetic page fixture for char_count/last_revision assertions.

Example fixture used for char_count/last_revision:

animation_page = (
    "<page>\n"
    "  <title>Animation</title>\n"
    "  <revision>\n"
    "    <timestamp>2020-12-31T11:28:21Z</timestamp>\n"
    "    <text xml:space=\"preserve\">"
    + ("A" * 69345)
    + "[[Category:Film and video technology]]"
    + "\n      </text>\n    </revision>\n  </page>"
)

Original prompt

shit's broken pls investigate, hypothesize, validate, and fix

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