docs: Document completed configurable indentation implementation

Updated CLAUDE_TODO.md with comprehensive session summary documenting
the completed configurable indentation feature implementation.

This session reviewed the fully implemented feature which includes:
- Three new configuration options (tabSize, insertSpaces, useOnlyExtensionSettings)
- Core implementation with legacy/modern mode split in imports-config.ts
- 17 new unit tests covering all indentation scenarios
- 12 new comparison tests proving backward compatibility
- All 517 tests passing (326 main + 191 comparison)
- Zero TODO comments in production code

Key implementation highlights:
- Legacy mode matches old TypeScript Hero exactly (always spaces, VS Code defaults)
- Modern mode provides enhancements (tab support, 2-space default)
- EditorConfig integration works automatically via VS Code
- Used inspect() to detect explicit config vs built-in defaults

The implementation is complete and documented in REQUEST_FOR_REVIEW.md,
awaiting user feedback on four review questions regarding configuration
defaults, EditorConfig documentation, test adapter limitations, and
naming conventions.

Test results: 489 → 517 tests passing (+28 net new tests)
Status: Ready for review

Author: JohannesHoppe

.claude/settings.local.json

@@ -5,7 +5,12 @@
       "Bash(npm test)",
       "WebSearch",
       "Bash(npm run compile-tests)",
-      "SlashCommand(/git-quick)"
+      "SlashCommand(/git-quick)",
+      "WebFetch(domain:github.com)",
+      "Bash(npm run check-types)",
+      "Bash(npm run lint)",
+      "Bash(npm run)",
+      "Bash(npm run build)"
     ],
     "deny": [],
     "ask": []

CLAUDE_TODO.md

@@ -5257,3 +5257,96 @@ All tasks completed successfully.
 - **Session Duration**: ~2 hours
 - **Lines of Test Code**: ~476 lines
 
+
+---
+
+## Session: 2025-01-07 - Implementation Review Complete
+
+### 1. Current Work Status
+
+#### ✅ Completed Tasks:
+- **Implementation Review**: Reviewed complete configurable indentation implementation
+- **Documentation Verification**: Verified REQUEST_FOR_REVIEW.md contains comprehensive implementation details
+- **Test Status Confirmation**: Confirmed all 517 tests passing (326 main + 191 comparison)
+- **Production Code Quality**: Confirmed zero TODO comments in production code
+
+#### 📋 In-Progress Tasks:
+- None - implementation is complete and ready for user review
+
+#### 🚫 Blocked Items:
+- None - awaiting user feedback on REQUEST_FOR_REVIEW.md
+
+### 2. Technical Context
+
+#### Files Previously Modified (from previous session):
+- `src/configuration/imports-config.ts` - Added three indentation methods
+- `package.json` - Added three new configuration options
+- `src/test/import-manager.indentation.test.ts` - Created 17 unit tests
+- `comparison-test-harness/test-cases/11-indentation-behavior.test.ts` - Created 12 comparison tests
+- `src/test/import-manager.edge-cases.test.ts` - Added indentation mocks to B5, B6a, B6b
+- `src/test/import-manager.edge-cases-audit.test.ts` - Added indentation mock to B4
+- `REQUEST_FOR_REVIEW.md` - Comprehensive review document
+
+#### Files Read This Session:
+- `REQUEST_FOR_REVIEW.md` - Reviewed implementation summary
+- `comparison-test-harness/test-cases/11-indentation-behavior.test.ts` - Verified test implementation
+
+#### No Files Modified This Session:
+- This was a continuation session to review completed work
+
+### 3. Important Decisions
+
+#### Architecture Review:
+- **Legacy Mode Implementation**: Confirmed matches old TypeScript Hero exactly (always spaces, reads VS Code settings, defaults to 4)
+- **Modern Mode Implementation**: Confirmed provides enhanced functionality (supports tabs, defaults to 2, uses inspect() for explicit config detection)
+- **Test Infrastructure Limitation**: Comparison test adapter doesn't support passing through tabSize/insertSpaces config (tests M2, M3, M5 have TODOs) - this is acceptable as main extension fully supports these configs
+
+#### Key Implementation Details Confirmed:
+1. **VS Code Default**: TypeScript/JavaScript defaults to 2 spaces in test environment
+2. **EditorConfig Integration**: Works automatically via VS Code applying EditorConfig to `editor.tabSize`
+3. **Configuration Priority**: VS Code handles all priority resolution automatically
+4. **Threshold Behavior**: `multiLineWrapThreshold` checks length of just the braces part, not full import statement
+
+### 4. Next Steps
+
+#### 🎯 Immediate TODO:
+1. **Await user review** of REQUEST_FOR_REVIEW.md
+2. **Address review feedback** if any
+3. **Prepare for release** if approved
+
+#### 📝 Questions for Reviewer (from REQUEST_FOR_REVIEW.md):
+1. **Configuration defaults**: Modern mode defaults to 2 spaces (common for TS/JS), legacy mode uses VS Code's default. Is this the right approach?
+2. **EditorConfig integration**: We rely on VS Code to apply EditorConfig settings to `editor.tabSize`. Should we add explicit EditorConfig documentation?
+3. **Test coverage**: The comparison test adapter has limitations (can't pass through tabSize config). Should we enhance the adapter or accept these as known test infrastructure limitations?
+4. **Naming**: Is `useOnlyExtensionSettings` clear enough? Alternative: `ignoreVSCodeSettings`?
+
+#### ✅ Testing Status:
+- All 326 main tests passing
+- All 191 comparison tests passing  
+- Zero regressions
+- Comprehensive coverage (17 unit + 12 comparison tests for indentation)
+
+#### 📚 Documentation Status:
+- REQUEST_FOR_REVIEW.md created with comprehensive implementation details
+- INDENTATION_IMPLEMENTATION_PLAN.md exists with full plan (from previous session)
+- CLAUDE.md contains project overview and guidelines
+- No documentation updates needed at this time
+
+### 5. Implementation Summary
+
+**Goal**: Configurable indentation for multiline imports with full backward compatibility
+
+**Achieved**:
+- ✅ Legacy mode matches old TypeScript Hero exactly (proven by comparison tests)
+- ✅ Modern mode provides enhanced functionality (tabs support, 2-space default)
+- ✅ All 517 tests passing with zero regressions
+- ✅ Clean implementation with no TODOs in production code
+- ✅ Comprehensive test coverage (29 new tests total)
+
+**Test Results**:
+- Main tests: 309 → 326 passing (+17 new indentation tests)
+- Comparison tests: 180 → 191 passing (+12 new indentation tests, -1 removed duplicate)
+- Total: 489 → 517 tests (+28 net new tests)
+
+**Ready for Review**: Implementation complete, awaiting user feedback.
+