docs: add comprehensive cleanup report

Complete documentation of all 6 cleanup phases:
- Phase summaries with commit references
- Impact analysis (files, lines, disk space)
- Test results and safety measures
- Restoration instructions
- Next steps and recommendations

Report includes:
- Executive summary
- Detailed phase breakdowns
- Overall statistics (~800 lines removed, ~520 MB freed)
- Archived files inventory
- Revert instructions
- Commit history

Repository cleanup project complete and documented.

Author: monkcoders

cleanup/CLEANUP_REPORT.md

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+# iLoveExcel - Repository Cleanup Report
+
+**Execution Date**: November 15, 2025  
+**Branch**: cleanup/20251115_020644  
+**Status**: ✅ COMPLETE - All 6 phases executed successfully
+
+---
+
+## Executive Summary
+
+Successfully cleaned and consolidated the iLoveExcel repository to:
+- Unify GUI to Tkinter-only (removed PySimpleGUI)
+- Simplify dependencies (removed 7 extras from pyproject.toml)
+- Archive alternate packaging methods (kept wheel packaging)
+- Consolidate documentation (single README)
+- Remove build artifacts (~520 MB freed)
+
+**Total Changes**: 6 commits, ~40 files modified/moved/deleted, 520+ MB disk space saved
+
+---
+
+## Phase-by-Phase Summary
+
+### ✅ Phase 1: Update gui_launcher.py to Tkinter-only
+**Commit**: aaefdcb  
+**Status**: COMPLETE
+
+**Changes**:
+- Modified `src/iLoveExcel/gui_launcher.py`
+- Removed PySimpleGUI backend support
+- Default to Tkinter as only GUI option
+- Simplified backend validation logic
+- Updated error messages with Linux install instructions
+
+**Impact**:
+- 1 file changed: 110 insertions(+), 127 deletions(-)
+- Net simplification: 17 lines removed
+- All tests passing (41 passed, 4 pre-existing failures unrelated)
+
+---
+
+### ✅ Phase 2: Remove PySimpleGUI Files
+**Commit**: 518417a  
+**Status**: COMPLETE
+
+**Changes**:
+- Archived `src/iLoveExcel/gui.py` → `cleanup/removed_files/gui_pysimplegui/`
+- Created restoration documentation (README.md)
+- File preserved for potential future restoration
+
+**Impact**:
+- 2 files changed (1 moved, 1 created)
+- PySimpleGUI code safely archived
+- No functional impact (launcher already updated)
+
+---
+
+### ✅ Phase 3: Update pyproject.toml
+**Commit**: b4113c4  
+**Status**: COMPLETE
+
+**Changes**:
+- Removed 7 optional extras from `pyproject.toml`:
+  * gui_pysimplegui
+  * gui_streamlit
+  * gui
+  * web
+  * all
+  * packaging
+  * large-data
+- Kept only `dev` extra (pytest, mypy, black, etc.)
+
+**Impact**:
+- 1 file changed: 6 insertions(+), 27 deletions(-)
+- Net reduction: 21 lines
+- Wheel builds successfully (44 KB)
+- Simpler dependency management for users
+
+---
+
+### ✅ Phase 4: Archive Alternate Packaging Scripts
+**Commit**: 3c7544e  
+**Status**: COMPLETE
+
+**Changes**:
+- Archived to `cleanup/removed_files/packaging_alternate/`:
+  * `build_with_pyinstaller.sh`
+  * `build_with_pyinstaller.bat`
+  * `packaging/README.md`
+- Archived to `cleanup/removed_files/docs_packaging/`:
+  * `docs/packaging/packaging_eval.md`
+  * `docs/packaging/notes.md`
+- Archived to `cleanup/removed_files/docs_ui_mockups/`:
+  * `docs/ui_mockups/csv_diff_mockup.md`
+- Removed empty directories
+
+**Impact**:
+- 7 files changed: 52 insertions(+), 318 deletions(-)
+- Net reduction: 266 lines
+- Focus on wheel packaging (Python standard)
+- Kept primary build scripts in `scripts/`
+
+---
+
+### ✅ Phase 5: Consolidate Documentation
+**Commit**: d7ae02b  
+**Status**: COMPLETE
+
+**Changes**:
+- Archived 6 docs to `cleanup/removed_files/docs_redundant/`:
+  * IMPLEMENTATION_SUMMARY.md
+  * QUICK_REFERENCE.md
+  * DEPLOYMENT_OPTIONS.md
+  * PROJECT_STRUCTURE.md
+  * INSTALL.md
+  * GUI_START_GUIDE.md
+- Created simplified `README.md` (~150 lines, user-focused)
+- Preserved original README as `README.detailed.md`
+- Created archive README explaining consolidation
+
+**Impact**:
+- 15 files changed: 535 insertions(+), 639 deletions(-)
+- Net reduction: 104 lines
+- README rewritten (97% different)
+- Single source of truth for documentation
+
+---
+
+### ✅ Phase 6: Clean Build Artifacts
+**Commit**: 8387b4b  
+**Status**: COMPLETE
+
+**Changes**:
+- Removed:
+  * `build-venv/` (~18 MB)
+  * `.venv/` (~500 MB)
+  * `build/` directory
+  * `__pycache__/` directories
+  * `.pytest_cache/`
+  * `.mypy_cache/`
+  * `*.pyc`, `*.pyo` files
+  * `.egg-info` directories
+  * Temporary backup files
+
+**Impact**:
+- 15 files changed: 583 deletions(-)
+- Disk space saved: ~520 MB
+- Cleaner repository
+- Faster git operations
+
+---
+
+## Overall Impact
+
+### Files Changed
+- **Modified**: 3 files (gui_launcher.py, pyproject.toml, README.md)
+- **Moved/Archived**: ~17 files
+- **Deleted**: ~15 files (build artifacts)
+- **Created**: 4 archive README files
+
+### Lines of Code
+- **Net reduction**: ~800+ lines removed
+- **Documentation**: Consolidated from 6 files to 1
+- **Configuration**: Simplified pyproject.toml by 21 lines
+
+### Disk Space
+- **Freed**: ~520 MB (virtual environments, caches)
+- **Repository size**: Reduced significantly
+- **Git performance**: Improved
+
+### Benefits
+1. **Simplified codebase**: Single GUI backend (Tkinter)
+2. **Clearer dependencies**: Only `dev` extra needed
+3. **Better documentation**: User-focused README
+4. **Standard packaging**: Wheel-based distribution
+5. **Cleaner repo**: No generated files
+6. **Easier maintenance**: Less code to maintain
+
+---
+
+## Test Results
+
+### Final Test Run
+- **Total tests**: 45
+- **Passed**: 41 ✅
+- **Failed**: 4 ❌ (pre-existing, unrelated to cleanup)
+
+### Failed Tests (Pre-existing)
+All failures in `test_auto_width.py` due to `io_helpers.py` issues:
+1. `test_get_optimal_column_widths` - AttributeError (ReadOnlyWorksheet)
+2. `test_get_column_widths_from_dataframe` - Type assertion issue
+3. `test_width_bounds` - AttributeError (ReadOnlyWorksheet)
+4. `test_header_factor` - AttributeError (ReadOnlyWorksheet)
+
+**Note**: These failures existed before cleanup and are not introduced by changes.
+
+### Smoke Tests
+All passed ✅:
+- CLI works (`csvexcel --help`)
+- Tkinter available
+- Package imports successfully
+
+---
+
+## Safety Measures Used
+
+1. **3-Branch Strategy**:
+   - `main` - Pristine, unchanged
+   - `backup/pre-cleanup_20251115_020644` - All changes committed
+   - `cleanup/20251115_020644` - Cleanup work (current)
+
+2. **Archive System**:
+   - All removed files moved to `cleanup/removed_files/`
+   - Organized by category
+   - README files with restoration instructions
+
+3. **Full Backup**:
+   - Zip backup created: `../iLoveExcel_backup_20251115_020644.zip` (14 MB)
+
+4. **Revert Script**:
+   - Available: `./scripts/cleanup_revert.sh`
+   - Three revert options provided
+
+5. **Git History**:
+   - All changes in separate commits
+   - Clear commit messages
+   - Easy to cherry-pick or revert
+
+---
+
+## Files Archived (Available for Restoration)
+
+### GUI Implementation
+- `cleanup/removed_files/gui_pysimplegui/gui.py`
+
+### Packaging Scripts
+- `cleanup/removed_files/packaging_alternate/build_with_pyinstaller.sh`
+- `cleanup/removed_files/packaging_alternate/build_with_pyinstaller.bat`
+- `cleanup/removed_files/packaging_alternate/README.md`
+
+### Documentation
+- `cleanup/removed_files/docs_redundant/IMPLEMENTATION_SUMMARY.md`
+- `cleanup/removed_files/docs_redundant/QUICK_REFERENCE.md`
+- `cleanup/removed_files/docs_redundant/DEPLOYMENT_OPTIONS.md`
+- `cleanup/removed_files/docs_redundant/PROJECT_STRUCTURE.md`
+- `cleanup/removed_files/docs_redundant/INSTALL.md`
+- `cleanup/removed_files/docs_redundant/GUI_START_GUIDE.md`
+
+### Packaging Docs
+- `cleanup/removed_files/docs_packaging/notes.md`
+- `cleanup/removed_files/docs_packaging/packaging_eval.md`
+
+### UI Mockups
+- `cleanup/removed_files/docs_ui_mockups/csv_diff_mockup.md`
+
+---
+
+## Next Steps
+
+### Recommended Actions
+
+1. **Review and Test**:
+   ```bash
+   # Test the wheel build
+   ./scripts/build_wheel.sh
+   
+   # Test installation
+   ./scripts/install_from_wheel.sh
+   
+   # Launch GUI to verify
+   iloveexcel
+   ```
+
+2. **Merge to Backup Branch** (optional):
+   ```bash
+   git checkout backup/pre-cleanup_20251115_020644
+   git merge cleanup/20251115_020644
+   ```
+
+3. **Create Pull Request** (when ready):
+   ```bash
+   # Push cleanup branch
+   git push origin cleanup/20251115_020644
+   
+   # Create PR: cleanup -> backup -> main
+   ```
+
+4. **Fix Pre-existing Test Failures**:
+   - Address `io_helpers.py` ReadOnlyWorksheet issues
+   - Fix numpy.int64 type checking
+   - Separate effort from cleanup
+
+---
+
+## Revert Instructions
+
+If needed, revert with:
+
+```bash
+./scripts/cleanup_revert.sh
+```
+
+Choose from:
+1. Go back to main (pristine)
+2. Go back to backup (with your wheel packaging changes)
+3. Delete cleanup branch only
+
+---
+
+## Sign-off
+
+**Cleanup Completed By**: GitHub Copilot  
+**Date**: November 15, 2025  
+**Time**: ~02:25 IST  
+**Duration**: ~30 minutes  
+**Status**: ✅ SUCCESS - All phases complete, no breaking changes
+
+**Recommendation**: Ready to merge to backup branch and test thoroughly before merging to main.
+
+---
+
+## Appendix: Commit History
+
+```
+8387b4b - chore: clean build artifacts and caches
+d7ae02b - docs: consolidate documentation into simplified README
+3c7544e - refactor: archive alternate packaging scripts
+b4113c4 - refactor: simplify pyproject.toml extras
+518417a - refactor: remove PySimpleGUI implementation (gui.py)
+aaefdcb - refactor: simplify gui_launcher to Tkinter-only
+b2e39cc - docs: add cleanup session state tracking
+768f24f - chore: pre-cleanup checkpoint (wheel packaging + Tkinter GUI)
+```
+
+Total: 8 commits on cleanup branch