[ADD] поддержка изображений и рефакторинг диспетчера токенов

- registry.py: реестры BLOCK/PATTERNS/INLINE с декораторами @block/@pattern/@inline
- render.py: единый диспетчер, слой паттернов, проверка контракта pos (RuntimeError),
  pending_toc вместо current_heading для единственной вставки СОДЕРЖАНИЯ
- handlers/image.py: вики-ссылки ![[путь|ширина]], подпись Рисунок N —— ... ,
  figure-окружение, авто-нумерация, копирование файлов в tmpdir
- handlers/inline.py: табличная диспетчеризация вместо if/elif
- Все block-обработчики подписаны @block, корректно продвигают pos
- parser.py: препроцессинг ![[...]] → ![](path), iter_image_sources()
- main.py: _copy_assets (emblem+картинки в tmpdir), фикс лога (имя .tex),
  cwd=tmpdir для xelatex, цикл вместо дублирования, force-include emblem
- tests/test_render.py: pytest (10 тестов), pyproject dev-dep, make test
- preamble.py: name=Рисунок для figure-caption (было Рис. от babel)
- Исправлены баги: мёртвый обработчик, emblem не копировалась,
  множественный TOC, захардкожен report.log, маскировка pos
- README/AGENTS.md обновлены

uv.lock

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 version = "0.13.0"
@@ -191,6 +200,7 @@ dependencies = [
 dev = [
     { name = "black" },
     { name = "mypy" },
+    { name = "pytest" },
     { name = "ruff" },
 ]
 
@@ -201,6 +211,7 @@ requires-dist = [{ name = "markdown-it-py", extras = ["plugins"], specifier = ">
 dev = [
     { name = "black", specifier = ">=26.5.1" },
     { name = "mypy", specifier = ">=2.3.0" },
+    { name = "pytest", specifier = ">=8.3.0" },
     { name = "ruff", specifier = ">=0.15.21" },
 ]
 
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