fix(mcp-docugen): preprocessor HTML→Markdown per output Word leggibile

Il DOCX prodotto dalla versione precedente emetteva i div Tielogic
(`<div class="cover">`, `<div class="info-col">`, `<div class="acceptance">`,
`<div class="status-card">`) come testo grezzo: Pandoc non sa
interpretare il CSS-flavoured HTML del PDF e li copia letteralmente
nel documento Word. Anche le tabelle `<table class="financial">`
finivano spezzate cella per cella.

Il fix introduce un preprocessor dedicato che riscrive tutta la
HTML Tielogic-flavoured in Markdown nativo prima di passare il
documento a Pandoc.

- docx_preprocessor.py: nuovo modulo basato su BeautifulSoup. Strippa
  frontmatter e <style>, poi rewrite di:
    * <div class="cover"> → titoli H1/H2, paragrafi, tabella pipe
      2-col FORNITORE/CLIENTE, validità in italic, \newpage finale
    * <table class="financial"> → tabella pipe Markdown con riga
      total-row in **bold**
    * <div class="acceptance"> → heading H2 + intro + tabella pipe
      con riga firma `_____________________` + luogo/data
    * <div class="status-card"> → paragrafo "**name** — descrizione"
    * <span class="badge ..."> → testo **bold**
    * <div class="page-break"> → \newpage Pandoc-friendly
- docx_renderer.py: deferisce tutto il preprocessing al nuovo modulo
  (più compatto, niente regex sparse).
- pyproject.toml + uv.lock: aggiunta dipendenza beautifulsoup4>=4.12.
- 8 nuovi test unit per il preprocessor (cover, tabelle, badge,
  acceptance, idempotenza, niente div residui, badge standalone).
  Adattati i test esistenti agli import dal nuovo modulo. 101 verde.

Smoke E2E via MCP: l'offerta TieMeasureFlow esce in DOCX leggibile
con tabelle Word native, heading colorati Tielogic e firme in tabella.

services/mcp-docugen/tests/unit/test_docx_preprocessor.py

@@ -0,0 +1,167 @@
+from __future__ import annotations
+
+import textwrap
+
+from mcp_docugen.docx_preprocessor import preprocess_for_docx
+
+
+SAMPLE_DOC = textwrap.dedent(
+    """\
+    ---
+    pdf_options:
+      format: A4
+    ---
+
+    <style>body { color: red; }</style>
+
+    <div class="cover">
+      <div class="brand">TIELOGIC</div>
+      <div class="brand-tagline">Soluzioni Software Industriali</div>
+      <div class="brand-divider"></div>
+      <div class="doc-title">OFFERTA PRODOTTO E INTEGRAZIONE</div>
+      <div class="doc-product">TieMeasureFlow</div>
+      <div class="doc-ref">Rif. OFF-2026-022 | 23 marzo 2026</div>
+      <div class="info-box">
+        <div class="info-col">
+          <div class="info-label">FORNITORE</div>
+          <div class="info-name">Tielogic SRL</div>
+          <div>Via Villanova 39, 36020 Solagna (VI)</div>
+          <div>P.IVA / C.F. 03954890244</div>
+        </div>
+        <div class="info-col">
+          <div class="info-label">CLIENTE</div>
+          <div class="info-name">Ricerca e Misure s.r.l.</div>
+          <div>Via Brigata Julia 21, 35020 Pernumia (PD)</div>
+          <div>Rif. Menoncin</div>
+        </div>
+      </div>
+      <div class="doc-validity">Validità offerta: 23 aprile 2026</div>
+    </div>
+
+    # TieMeasureFlow
+
+    Sistema web SPC.
+
+    ## Costo di setup iniziale
+
+    <table class="financial">
+    <thead><tr><th>Voce</th><th class="num">Importo</th></tr></thead>
+    <tbody>
+    <tr><td>Setup</td><td class="num">€ 3.500,00</td></tr>
+    <tr class="total-row"><td>TOTALE SETUP</td><td class="num">€ 3.500,00</td></tr>
+    </tbody>
+    </table>
+
+    <div class="status-card drift">
+      <div class="name">TEST Z +50MM <span class="badge badge-drift">DRIFT</span></div>
+      <div>Errore cumulativo da 7.8mm a 11.5mm.</div>
+    </div>
+
+    <div class="acceptance">
+    <h2 class="acceptance-title">ACCETTAZIONE</h2>
+    <div class="acceptance-intro">Per accettazione, restituire copia firmata.</div>
+    <div class="signature-grid"><div class="sig-col"><div class="sig-party">Per Tielogic SRL</div><div class="sig-line">Firma e timbro</div></div><div class="sig-col"><div class="sig-party">Per Ricerca e Misure s.r.l.</div><div class="sig-line">Firma e timbro</div></div></div>
+    <div class="place-date">Luogo e data: ____________ 23 marzo 2026</div>
+    </div>
+    """
+)
+
+
+def test_preprocessor_strips_style_and_frontmatter():
+    out = preprocess_for_docx(SAMPLE_DOC)
+    assert "<style>" not in out
+    assert "pdf_options" not in out
+    assert not out.startswith("---")
+
+
+def test_preprocessor_converts_cover_to_markdown():
+    out = preprocess_for_docx(SAMPLE_DOC)
+    assert '<div class="cover">' not in out
+    assert "# TIELOGIC" in out
+    assert "*Soluzioni Software Industriali*" in out
+    assert "## OFFERTA PRODOTTO E INTEGRAZIONE" in out
+    assert "**TieMeasureFlow**" in out
+    assert "Rif. OFF-2026-022 | 23 marzo 2026" in out
+    # Info table 2-col
+    assert "| **FORNITORE** | **CLIENTE** |" in out
+    assert "**Tielogic SRL**" in out
+    assert "**Ricerca e Misure s.r.l.**" in out
+    assert "Via Villanova 39, 36020 Solagna (VI)" in out
+    assert "*Validità offerta: 23 aprile 2026*" in out
+    # newpage after cover
+    assert "\\newpage" in out
+
+
+def test_preprocessor_converts_financial_table_to_pipe():
+    out = preprocess_for_docx(SAMPLE_DOC)
+    assert '<table class="financial">' not in out
+    assert "| Voce | Importo |" in out
+    assert "| Setup | € 3.500,00 |" in out
+    # total row bolded
+    assert "| **TOTALE SETUP** | **€ 3.500,00** |" in out
+
+
+def test_preprocessor_converts_status_card_to_paragraph():
+    out = preprocess_for_docx(SAMPLE_DOC)
+    assert 'class="status-card' not in out
+    assert "**TEST Z +50MM" in out
+    assert "Errore cumulativo da 7.8mm a 11.5mm" in out
+
+
+def test_preprocessor_converts_badges_to_bold():
+    out = preprocess_for_docx(SAMPLE_DOC)
+    assert "badge-drift" not in out
+    # Badge inside status-card name gets absorbed into the bold name string;
+    # checking that the badge text survives somewhere inside a bold span.
+    assert "DRIFT" in out
+    assert "<span" not in out
+
+
+def test_preprocessor_converts_standalone_badges_to_bold():
+    md = "Verdetto: <span class=\"badge badge-fattibile\">FATTIBILE</span>"
+    out = preprocess_for_docx(md)
+    assert "<span" not in out
+    assert "**FATTIBILE**" in out
+
+
+def test_preprocessor_converts_acceptance_to_table():
+    out = preprocess_for_docx(SAMPLE_DOC)
+    assert 'class="acceptance"' not in out
+    assert "## ACCETTAZIONE" in out
+    assert "Per accettazione, restituire copia firmata." in out
+    assert "| **Per Tielogic SRL** | **Per Ricerca e Misure s.r.l.** |" in out
+    assert "| _____________________ | _____________________ |" in out
+    assert "| Firma e timbro | Firma e timbro |" in out
+    assert "Luogo e data" in out
+
+
+def test_preprocessor_idempotent_on_clean_markdown():
+    md = "# Title\n\nA paragraph.\n\n| a | b |\n|---|---|\n| 1 | 2 |\n"
+    out = preprocess_for_docx(md)
+    # No frontmatter to strip, no Tielogic widgets to rewrite.
+    assert "# Title" in out
+    assert "| a | b |" in out
+    assert "<style" not in out
+
+
+def test_preprocessor_no_div_classes_left_in_output():
+    out = preprocess_for_docx(SAMPLE_DOC)
+    for forbidden in (
+        "<div class=\"cover\"",
+        "<div class=\"info-box\"",
+        "<div class=\"info-col\"",
+        "<div class=\"info-label\"",
+        "<div class=\"info-name\"",
+        "<div class=\"doc-title\"",
+        "<div class=\"doc-product\"",
+        "<div class=\"doc-ref\"",
+        "<div class=\"doc-validity\"",
+        "<div class=\"acceptance\"",
+        "<div class=\"signature-grid\"",
+        "<div class=\"sig-col\"",
+        "<div class=\"sig-party\"",
+        "<div class=\"sig-line\"",
+        "<div class=\"place-date\"",
+        "<div class=\"status-card",
+    ):
+        assert forbidden not in out, f"{forbidden!r} still present in output"