feat: initial project setup with roadmap, exercise data, and docs

Establish SneakySwole project foundation:
- CLAUDE.md with project overview, stack, and development guidelines
- 5-phase roadmap (scaffold, data layer, workout UI, logging, progression)
- Exercise library YAML with 6 warmups and 20 exercises (form cues, tempo, sets)
- User programs YAML with week 1/4 targets for Phillip and Daughter
- Design doc capturing roadmap, data, and auth model decisions
- Code guidelines, security standards, and .gitignore
- Source workout spreadsheet (workout_plan_v2.xlsx)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,39 @@
+# Python
+__pycache__/
+*.py[cod]
+*.pyo
+*.egg-info/
+dist/
+build/
+*.egg
+
+# Virtual environments
+.venv/
+venv/
+
+# Environment variables
+.env
+
+# SQLite database
+data/*.db
+data/*.db-journal
+data/*.db-wal
+
+# IDE
+.vscode/
+.idea/
+*.swp
+*.swo
+*~
+
+# OS
+.DS_Store
+Thumbs.db
+
+# Docker
+docker-compose.override.yaml
+
+# Testing
+.pytest_cache/
+.coverage
+htmlcov/