Add test analysis documentation and editor configuration

- Add comprehensive test_summary.md documenting all 22 test failures
- Add .editorconfig with Roslynator analyzer settings
- Document test status: 97.6% passing (956/979 tests)
- Categorize failures by severity and identify root causes
- Provide recommendations for fixing priority issues

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

Author: knilecrack

.editorconfig

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+[*.cs]
+
+# RCS1139: Add summary element to documentation comment
+dotnet_diagnostic.RCS1139.severity = none
+
+# RCS1044: Remove original exception from throw statement
+dotnet_diagnostic.RCS1044.severity = none
+
+# RCS1102: Make class static
+dotnet_diagnostic.RCS1102.severity = suggestion

OpenXmlPowerTools/test_summary.md

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+# Test Results Summary
+
+## Overall Status
+- **Total Tests:** 979
+- **Passed:** 956 (97.6%)
+- **Failed:** 22 (2.2%)
+- **Skipped:** 1 (0.1%)
+
+## Test Failures by Category
+
+### 1. PowerToolsBlockExtensionsTests (1 failure)
+**Test:** `MustEndPowerToolsBlockToUseStronglyTypedClasses`
+**Error:** Assert.Single() failure - collection contained 2 items instead of 1
+**Severity:** Low - appears to be a test assertion issue
+
+### 2. Excel Currency Formatting - CfTests (7 failures)
+**Issue:** Currency symbols have extra "-" prefix
+- Expected: "₩ -" → Actual: "-₩ -"
+- Expected: "£ -" → Actual: "-£ -"
+- Expected: "¥ -" → Actual: "-¥ -"
+- Expected: "€  -" → Actual: "-€  -"
+- Expected: "CHF  -" → Actual: "-CHF  -"
+- Expected: "$ -" → Actual: "-$ -"
+
+**Severity:** Medium - Excel number formatting inconsistency
+
+### 3. SpreadsheetWriter Tests (1 failure)
+**Test:** `SW002_AllDataTypes`
+**Error:** Cell validation errors for date values ('2012-01-09T00:00', '2012-01-08T00:00')
+**Severity:** Medium - date formatting validation issue
+
+### 4. PresentationBuilder Tests (1 failure)
+**Test:** `PB006_VideoFormats`
+**Error:** `System.IO.IOException: Entries cannot be opened multiple times in Update mode`
+**Severity:** Medium - PowerPoint package access issue
+
+### 5. DocumentBuilder Tests (1 failure)
+**Test:** `DB009_ShredDocument`
+**Error:** `System.Xml.XmlException: Data at the root level is invalid. Line 57, position 9`
+**Location:** ReferenceAdder.cs:119 in AddToc method
+**Severity:** Medium - XML parsing issue in TOC generation
+
+### 6. WmlComparer Tests (11 failures)
+Most critical category with multiple types of failures:
+
+#### Type A: Duplicate FontTable Relationship (3 failures)
+- WC002_Consolidate_Bulk_Test (RC/RC002-Image.docx)
+- WC003_Compare (RC/RC002-Image.docx)
+- WC001_Consolidate (RC/RC002-Image.docx)
+
+**Error:** "The package/part 'MainDocumentPart{/word/document.xml}' can only have one instance of relationship that targets part fontTable"
+**Severity:** HIGH - package relationship corruption issue
+
+#### Type B: Missing/Wrong Revision Count (6 failures)
+- WC-1720: Expected 7, Actual 6
+- WC-1710: Expected 7, Actual 6
+- WC-1500: Expected 2, Actual 10
+- WC-1660: Expected 5, Actual 0
+- WC-1670: Expected 5, Actual 0
+- WC-1750: Expected 6, Actual 0
+- WC-1760: Expected 6, Actual 0
+
+**Severity:** MEDIUM to HIGH - comparison algorithm accuracy issues
+
+#### Type C: Invalid PackageRelationship (1 failure)
+- WC-1240: "PackageRelationship with specified ID does not exist for the source part"
+**Error location:** WmlComparer.cs:4753 in MoveRelatedPartsToDestination
+**Severity:** HIGH - missing relationship handling issue
+
+## Analysis
+
+### Known Issues (from your list):
+1. ✅ **FIXED:** SplitOnSections body-level w:sectPr - This was addressed in our recent commit
+2. ⚠️ **REMAINING:** AdjustSectionBreak removes wrong w:sectPr
+3. ⚠️ **REMAINING:** MainDocumentPart/Comments part XDocument mutation
+
+### Newly Identified Issues:
+1. **WmlComparer FontTable Duplication** - Multiple relationship instances being created (HIGH priority)
+2. **WmlComparer Revision Counting** - Incorrect revision detection in footnote/endnote scenarios
+3. **WmlComparer Relationship Handling** - Missing relationships in image comparison scenarios
+4. **ReferenceAdder TOC XML** - Invalid XML generation
+5. **PresentationBuilder Zip Access** - Concurrent file access issue
+6. **Excel Formatting** - Currency/date formatting issues
+
+### Recommendations:
+1. **Immediate Priority:** Fix WmlComparer duplicate fontTable relationship issue (affects 3 tests)
+2. **High Priority:** Fix AdjustSectionBreak (known issue #2)
+3. **High Priority:** Fix XDocument mutation (known issue #3)
+4. **Medium Priority:** Address WmlComparer revision counting accuracy
+5. **Lower Priority:** Excel formatting and PresentationBuilder issues
+
+## Next Steps
+Would you like me to:
+1. Investigate the WmlComparer fontTable duplication issue?
+2. Fix the second known issue (AdjustSectionBreak)?
+3. Analyze a specific test failure category?