Add core Python script (yaml2pptx.py) for converting YAML to PowerPoint: - Element rendering: text, image, shape, table, chart - Template system with placeholders - PPTX generation with python-pptx OpenSpec workflow setup: - 3 archived changes: browser-preview, template-dir-cli, yaml-to-pptx - 7 main specifications covering all core modules - Config and documentation structure 30 files changed, 4984 insertions(+)