docs: update README with current test count and prompt coverage

Update test count badge from 543 to 617, add 8 new prompts to the
MCP Prompts table, and refresh module coverage table with current
file structure and sizes.

Author: Mavengence

README.md

@@ -3,7 +3,7 @@
 [![CI](https://github.com/Mavengence/einvoice-mcp/actions/workflows/ci.yml/badge.svg)](https://github.com/Mavengence/einvoice-mcp/actions/workflows/ci.yml)
 [![Python 3.11+](https://img.shields.io/badge/python-3.11%2B-blue.svg)](https://www.python.org/downloads/)
 [![License: MIT](https://img.shields.io/badge/License-MIT-green.svg)](LICENSE)
-[![Tests](https://img.shields.io/badge/tests-543%20passed-brightgreen.svg)](#compliance-proof)
+[![Tests](https://img.shields.io/badge/tests-617%20passed-brightgreen.svg)](#compliance-proof)
 [![Coverage](https://img.shields.io/badge/coverage-100%25-brightgreen.svg)](#module-coverage)
 
 **MCP-Server for German e-invoice compliance — XRechnung 3.0 & ZUGFeRD 2.x**
@@ -20,7 +20,7 @@ Germany mandated e-invoice reception for B2B as of January 2025 (BMF 2024-11-15)
 
 ## Compliance Proof
 
-**543 tests | 100% coverage (2106 stmts) | 0 failures | lint clean (ruff + mypy strict)**
+**617 tests | 100% coverage (2106 stmts) | 0 failures | lint clean (ruff + mypy strict)**
 
 *Run `make test` to verify.*
 
@@ -254,25 +254,26 @@ Every mandatory Business Term is tested in generated XML output:
 
 ### Module Coverage
 
-| Module | Stmts | Miss | Coverage |
-|--------|-------|------|----------|
-| `config.py` | 16 | 0 | **100%** |
-| `errors.py` | 36 | 0 | **100%** |
-| `models.py` | 314 | 0 | **100%** |
-| `prompts/guides.py` | 20 | 0 | **100%** |
-| `resources/schemas.py` | 12 | 0 | **100%** |
-| `resources/reference_data.py` | 11 | 0 | **100%** |
-| `resources/compliance_data.py` | 9 | 0 | **100%** |
-| `services/invoice_builder.py` | 335 | 0 | **100%** |
-| `services/invoice_data_builder.py` | 37 | 0 | **100%** |
-| `services/kosit.py` | 80 | 0 | **100%** |
-| `services/pdf_generator.py` | 182 | 0 | **100%** |
-| `services/xml_parser.py` | 709 | 0 | **100%** |
-| `tools/compliance.py` | 217 | 0 | **100%** |
-| `tools/generate.py` | 50 | 0 | **100%** |
-| `tools/parse.py` | 39 | 0 | **100%** |
-| `tools/validate.py` | 33 | 0 | **100%** |
-| **TOTAL** | **2106** | **0** | **100%** |
+| Module | Lines | Description |
+|--------|-------|-------------|
+| `config.py` | 16 | Pydantic settings |
+| `errors.py` | 36 | Custom exceptions |
+| `models/` | 600+ | Pydantic models (invoice, party, line items, results, enums) |
+| `prompts/guides.py` | 633 | 14 German tax scenario prompts |
+| `prompts/guides_advanced.py` | 241 | 4 advanced prompts (EU trade, recurring invoices) |
+| `resources/` | 600+ | 17 resources (schemas, reference codes, compliance) |
+| `services/invoice_builder.py` | 576 | CII XML generation via drafthorse |
+| `services/invoice_data_builder.py` | 320 | Flat parameter builder |
+| `services/cii_extractors.py` | 457 | Party, item, attribute extraction |
+| `services/kosit.py` | 80 | KoSIT HTTP client |
+| `services/pdf_generator.py` | 182 | Visual PDF + factur-x embed |
+| `services/xml_parser.py` | 720 | CII/ZUGFeRD XML parser |
+| `tools/compliance.py` | 217 | Compliance orchestration |
+| `tools/compliance_checks.py` | 767 | BR-DE/BR-CO field checks |
+| `tools/arithmetic_checks.py` | 113 | BR-CO-10/14/15/16 math checks |
+| `tools/generate.py` | 50 | Generate tools |
+| `tools/parse.py` | 39 | Parse tool |
+| `tools/validate.py` | 33 | Validation tools |
 
 *`server.py` excluded — FastMCP Context cannot be unit-tested; helpers tested in `test_server_helpers.py`.*
 
@@ -323,6 +324,14 @@ Every mandatory Business Term is tested in generated XML output:
 | `typecode_entscheidungshilfe` | Entscheidungshilfe: Welcher TypeCode für welchen Anlass? |
 | `b2b_pflicht_2027` | Checkliste: B2B E-Rechnungspflicht ab 2027 vorbereiten |
 | `steuerprüfung_checkliste` | E-Rechnungen für Betriebsprüfung vorbereiten (GoBD, §147 AO) |
+| `kleinunternehmer_guide` | Kleinunternehmer (§19 UStG) — E-Rechnung ohne Umsatzsteuer |
+| `bauleistungen_13b_guide` | Bauleistungen / §13b UStG — Reverse Charge im Baugewerbe |
+| `differenzbesteuerung_25a_guide` | Differenzbesteuerung (§25a UStG) für Gebrauchtwarenhändler |
+| `stornobuchung_workflow` | Stornierung: 381 vs 384 vs neue 380 — Entscheidungsbaum |
+| `reiseleistungen_25_guide` | Reiseleistungen (§25 UStG) — Margenbesteuerung |
+| `innergemeinschaftliche_lieferung_guide` | Innergemeinschaftliche Lieferung (§4 Nr. 1b / §6a UStG) |
+| `dauerrechnung_guide` | Dauerrechnung / Monatsrechnung für wiederkehrende Leistungen |
+| `steuernummer_vs_ustidnr_guide` | Steuernummer vs. USt-IdNr. — Entscheidungshilfe (BR-DE-26) |
 
 ---