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.

uv.lock

@@ -75,6 +75,19 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/64/b4/17d4b0b2a2dc85a6df63d1157e028ed19f90d4cd97c36717afef2bc2f395/attrs-26.1.0-py3-none-any.whl", hash = "sha256:c647aa4a12dfbad9333ca4e71fe62ddc36f4e63b2d260a37a8b83d2f043ac309", size = 67548, upload-time = "2026-03-19T14:22:23.645Z" },
 ]
 
+[[package]]
+name = "beautifulsoup4"
+version = "4.14.3"
+source = { registry = "https://pypi.org/simple" }
+dependencies = [
+    { name = "soupsieve" },
+    { name = "typing-extensions" },
+]
+sdist = { url = "https://files.pythonhosted.org/packages/c3/b0/1c6a16426d389813b48d95e26898aff79abbde42ad353958ad95cc8c9b21/beautifulsoup4-4.14.3.tar.gz", hash = "sha256:6292b1c5186d356bba669ef9f7f051757099565ad9ada5dd630bd9de5fa7fb86", size = 627737, upload-time = "2025-11-30T15:08:26.084Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/1a/39/47f9197bdd44df24d67ac8893641e16f386c984a0619ef2ee4c51fbbc019/beautifulsoup4-4.14.3-py3-none-any.whl", hash = "sha256:0918bfe44902e6ad8d57732ba310582e98da931428d231a5ecb9e7c703a735bb", size = 107721, upload-time = "2025-11-30T15:08:24.087Z" },
+]
+
 [[package]]
 name = "certifi"
 version = "2026.2.25"
@@ -587,6 +600,7 @@ source = { editable = "services/mcp-docugen" }
 dependencies = [
     { name = "aiofiles" },
     { name = "aiosqlite" },
+    { name = "beautifulsoup4" },
     { name = "fastapi" },
     { name = "httpx" },
     { name = "markdown-it-py", extra = ["plugins"] },
@@ -612,6 +626,7 @@ dev = [
 requires-dist = [
     { name = "aiofiles", specifier = ">=24.0" },
     { name = "aiosqlite", specifier = ">=0.20" },
+    { name = "beautifulsoup4", specifier = ">=4.12" },
     { name = "fastapi", specifier = ">=0.115" },
     { name = "httpx", specifier = ">=0.27" },
     { name = "markdown-it-py", extras = ["plugins"], specifier = ">=3.0" },
@@ -1257,6 +1272,15 @@ wheels = [
     { url = "https://files.pythonhosted.org/packages/63/b6/aeadee5443e49baa2facd51131159fd6301cc4ccfc1541e4df7b021c37dd/ruff-0.15.11-py3-none-win_arm64.whl", hash = "sha256:063fed18cc1bbe0ee7393957284a6fe8b588c6a406a285af3ee3f46da2391ee4", size = 11032614, upload-time = "2026-04-16T18:46:34.487Z" },
 ]
 
+[[package]]
+name = "soupsieve"
+version = "2.8.3"
+source = { registry = "https://pypi.org/simple" }
+sdist = { url = "https://files.pythonhosted.org/packages/7b/ae/2d9c981590ed9999a0d91755b47fc74f74de286b0f5cee14c9269041e6c4/soupsieve-2.8.3.tar.gz", hash = "sha256:3267f1eeea4251fb42728b6dfb746edc9acaffc4a45b27e19450b676586e8349", size = 118627, upload-time = "2026-01-20T04:27:02.457Z" }
+wheels = [
+    { url = "https://files.pythonhosted.org/packages/46/2c/1462b1d0a634697ae9e55b3cecdcb64788e8b7d63f54d923fcd0bb140aed/soupsieve-2.8.3-py3-none-any.whl", hash = "sha256:ed64f2ba4eebeab06cc4962affce381647455978ffc1e36bb79a545b91f45a95", size = 37016, upload-time = "2026-01-20T04:27:01.012Z" },
+]
+
 [[package]]
 name = "sse-starlette"
 version = "3.3.4"