Add Week 12 implementation summary documentation

Co-authored-by: jenicek001 <60535859+jenicek001@users.noreply.github.com>

Author: Copilot

docs/implementation/WEEK12_IMPLEMENTATION_SUMMARY.md

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+# Week 12 Implementation Summary
+
+**Date:** January 24, 2026  
+**Task:** Implement next step (Week 12: Beta Release v0.9.0)  
+**Status:** ✅ COMPLETE  
+**PR:** #TBD (copilot/implement-next-project-step)
+
+---
+
+## Objective
+
+Prepare and build PVSolarSim v0.9.0 beta release for PyPI publication as outlined in PLANNING.md Week 12.
+
+## What Was Done
+
+### 1. Pre-Release Preparation ✅
+
+#### Version Updates
+- Updated `pyproject.toml` version: 0.1.0 → 0.9.0
+- Updated `PLANNING.md` current version: v0.1.0-alpha → v0.9.0-beta
+- Updated `CHANGELOG.md` with comprehensive v0.9.0 release notes
+
+#### Code Quality Fixes
+- Ran `black` formatter on all files (38 files reformatted)
+- Ran `ruff` linter and fixed all issues (28 errors fixed)
+- All 314 tests passing
+- Test coverage: 90.62% (exceeds 81% requirement)
+
+### 2. Package Building ✅
+
+#### Build Tools Installation
+```bash
+pip install build twine
+```
+
+#### Package Build
+```bash
+python -m build
+```
+
+**Output:**
+- `dist/pvsolarsim-0.9.0.tar.gz` (78KB)
+- `dist/pvsolarsim-0.9.0-py3-none-any.whl` (51KB)
+
+#### Validation
+```bash
+twine check dist/*
+```
+**Result:** PASSED ✅
+
+### 3. Dependency Fix ✅
+
+**Issue Found:** pvlib was in dev dependencies but is required at runtime
+
+**Fix Applied:**
+- Moved `pvlib>=0.10.0` from `[project.optional-dependencies]` to `[project.dependencies]`
+- Rebuilt package
+- Validated with fresh virtual environment installation
+- Tested functionality successfully
+
+### 4. GitHub Repository Enhancements ✅
+
+#### Issue Templates Created
+- `.github/ISSUE_TEMPLATE/bug_report.md` - Structured bug reporting
+- `.github/ISSUE_TEMPLATE/feature_request.md` - Feature request template
+
+Both templates include:
+- Clear sections for description
+- Environment information
+- Code examples
+- Additional context
+
+### 5. Documentation ✅
+
+#### Release Notes
+Created comprehensive `RELEASE_NOTES_v0.9.0.md` including:
+- Overview of beta release
+- New features and enhancements
+- Bug fixes
+- Installation instructions
+- Quick start guide
+- Known issues
+- Roadmap for v1.0.0
+- Contributing guidelines
+
+### 6. Testing & Validation ✅
+
+#### Test Results
+```
+314 passed, 18 deselected, 18 warnings in 7.19s
+Coverage: 90.62%
+```
+
+#### Package Installation Test
+Created fresh virtual environment and tested:
+```python
+from pvsolarsim import Location, PVSystem, calculate_power
+from datetime import datetime
+import pytz
+
+location = Location(latitude=49.8, longitude=15.5, altitude=300, timezone="Europe/Prague")
+system = PVSystem(panel_area=10.0, panel_efficiency=0.20, tilt=35, azimuth=180)
+timestamp = datetime(2026, 6, 21, 12, 0, tzinfo=pytz.timezone("Europe/Prague"))
+
+result = calculate_power(location, system, timestamp)
+# Result: 1854.93 W ✓
+```
+
+**Verdict:** Package works perfectly! ✅
+
+## Files Created/Modified
+
+### Created
+- `RELEASE_NOTES_v0.9.0.md` - Comprehensive release notes
+- `.github/ISSUE_TEMPLATE/bug_report.md` - Bug report template
+- `.github/ISSUE_TEMPLATE/feature_request.md` - Feature request template
+- `dist/pvsolarsim-0.9.0.tar.gz` - Source distribution
+- `dist/pvsolarsim-0.9.0-py3-none-any.whl` - Wheel distribution
+
+### Modified
+- `pyproject.toml` - Version bump, dependency fix
+- `CHANGELOG.md` - v0.9.0 release notes
+- `PLANNING.md` - Week 12 status update
+- 38 Python files - Formatting fixes (black, ruff)
+
+## Next Steps (Manual/External)
+
+The following tasks require manual action by the repository owner:
+
+### PyPI Publication
+1. **Test PyPI Upload**
+   ```bash
+   twine upload --repository testpypi dist/*
+   ```
+
+2. **Test Installation from Test PyPI**
+   ```bash
+   pip install --index-url https://test.pypi.org/simple/ pvsolarsim==0.9.0
+   ```
+
+3. **Production PyPI Upload**
+   ```bash
+   twine upload dist/*
+   ```
+
+4. **GitHub Release**
+   - Create release from tag `v0.9.0`
+   - Use content from `RELEASE_NOTES_v0.9.0.md`
+   - Attach distribution files
+
+### Post-Release
+- Announce on Reddit (r/solar, r/Python)
+- Announce on Twitter/X, LinkedIn
+- Monitor GitHub issues for bug reports
+- Provide user support
+
+## Technical Notes
+
+### Package Structure
+```
+pvsolarsim-0.9.0/
+├── src/pvsolarsim/
+│   ├── __init__.py
+│   ├── api/
+│   ├── atmosphere/
+│   ├── core/
+│   ├── irradiance/
+│   ├── power.py
+│   ├── simulation/
+│   ├── solar/
+│   ├── temperature/
+│   └── weather/
+├── tests/
+├── pyproject.toml
+├── README.md
+└── LICENSE
+```
+
+### Dependencies (Runtime)
+- numpy>=1.24.0
+- pandas>=2.0.0
+- scipy>=1.10.0
+- requests>=2.31.0
+- pydantic>=2.5.0
+- python-dateutil>=2.8.0
+- pytz>=2023.3
+- pvlib>=0.10.0 ✅ (fixed)
+
+### Python Support
+- Python 3.9, 3.10, 3.11, 3.12
+
+## Metrics
+
+- **Lines of Code:** 970 (excluding tests)
+- **Test Coverage:** 90.62%
+- **Tests Passing:** 314
+- **Package Size:** 78KB (source), 51KB (wheel)
+- **Dependencies:** 8 runtime, 7 dev
+- **Documentation Files:** 50+ (including Sphinx docs)
+- **Examples:** 13 complete examples
+
+## Conclusion
+
+Week 12 implementation is **100% complete** for all automated tasks. The package is:
+- ✅ Built and validated
+- ✅ Tested and working
+- ✅ Documented comprehensively
+- ✅ Ready for PyPI upload
+
+The only remaining steps require PyPI credentials and manual publication, which should be done by the repository owner.
+
+**Status:** Ready for beta release publication 🚀