feat(chunks): rilevamento universale has_math/has_table + dollarmath plugin

- parser.py: integra dollarmath_plugin (graceful fallback) — blocchi $$…$$ → token math_block atomico
- segmenter.py: gestisce math_block → Block(kind=math, atomic=True, plain_text=[formula])
- packer.py: has_table rileva anche <table> in blocchi html; has_math rileva $$ e \begin{ nel contenuto
- +11 test (parser×3, segmenter×3, packer×5) — totale 65 test

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tests/chunks/test_packer.py

@@ -116,3 +116,35 @@ def test_assets_empty(cfg):
     blocks = [make_block(1, "Testo.")]
     chunks = pack(blocks, cfg, "test")
     assert chunks[0].assets == []
+
+
+def test_flags_has_math_via_kind(cfg):
+    blocks = [make_block(1, "$$\nE=mc^2\n$$", kind="math", atomic=True)]
+    chunks = pack(blocks, cfg, "test")
+    assert chunks[0].flags["has_math"] is True
+
+
+def test_flags_has_math_via_content_dollars(cfg):
+    # Paragrafo con $$ inline (senza dollarmath plugin attivo)
+    blocks = [make_block(1, "Vedi la formula:\n$$\nx^2\n$$")]
+    chunks = pack(blocks, cfg, "test")
+    assert chunks[0].flags["has_math"] is True
+
+
+def test_flags_has_math_via_content_begin(cfg):
+    blocks = [make_block(1, r"Equazione: \begin{align} x = 1 \end{align}")]
+    chunks = pack(blocks, cfg, "test")
+    assert chunks[0].flags["has_math"] is True
+
+
+def test_flags_has_table_via_html(cfg):
+    html_content = "<table><tr><td>A</td></tr></table>"
+    blocks = [make_block(1, html_content, kind="html", atomic=True)]
+    chunks = pack(blocks, cfg, "test")
+    assert chunks[0].flags["has_table"] is True
+
+
+def test_flags_no_math_plain_text(cfg):
+    blocks = [make_block(1, "Testo normale senza formule.")]
+    chunks = pack(blocks, cfg, "test")
+    assert chunks[0].flags["has_math"] is False

tests/chunks/test_parser.py

@@ -44,3 +44,26 @@ def test_lines_preserves_source():
     _, lines = parse(md)
     assert lines[0] == "Riga 1"
     assert lines[1] == "Riga 2"
+
+
+def test_parse_math_block():
+    md = "# T\n\n$$\nE=mc^2\n$$\n"
+    tokens, lines = parse(md)
+    types = [t.type for t in tokens]
+    assert "math_block" in types
+
+
+def test_math_block_has_source_map():
+    md = "# T\n\n$$\nE=mc^2\n$$\n"
+    tokens, lines = parse(md)
+    mb = next(t for t in tokens if t.type == "math_block")
+    assert mb.map is not None
+    assert "E=mc^2" in mb.content
+
+
+def test_parse_math_inline_stays_in_paragraph():
+    md = "Testo con $x^2$ inline.\n"
+    tokens, lines = parse(md)
+    types = [t.type for t in tokens]
+    assert "paragraph_open" in types
+    assert "math_block" not in types

tests/chunks/test_segmenter.py

@@ -126,3 +126,30 @@ def test_source_line_numbers(cfg):
     para = next(b for b in blocks if b.kind == "paragraph")
     assert para.start_line == 2
     assert para.end_line == 3
+
+
+def test_math_block_is_atomic(cfg):
+    md = "# T\n\n$$\nE=mc^2\n$$\n"
+    tokens, lines = parse(md)
+    blocks = segment(tokens, lines, cfg)
+    math = next((b for b in blocks if b.kind == "math"), None)
+    assert math is not None
+    assert math.atomic is True
+    assert "E=mc^2" in math.content
+
+
+def test_math_block_plain_text(cfg):
+    md = "# T\n\n$$\n\\int_0^1 f(x) dx\n$$\n"
+    tokens, lines = parse(md)
+    blocks = segment(tokens, lines, cfg)
+    math = next(b for b in blocks if b.kind == "math")
+    assert math.plain_text == "[formula]"
+
+
+def test_html_block_with_table(cfg):
+    md = "# T\n\n<table><tr><td>A</td></tr></table>\n"
+    tokens, lines = parse(md)
+    blocks = segment(tokens, lines, cfg)
+    html = next((b for b in blocks if b.kind == "html"), None)
+    assert html is not None
+    assert "<table" in html.content