chore: initialize project scaffold

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

.gitignore

@@ -0,0 +1,38 @@
+.venv/
+__pycache__/
+*.pyc
+*.pyo
+*.pyd
+.Python
+*.egg-info/
+dist/
+build/
+.eggs/
+
+# Secrets — never commit these
+.env
+*.env
+.env.*
+!.env.example
+
+# Exported conversation data — may contain private content
+exports/
+*.md
+*.json
+!tests/fixtures/*.json
+!README.md
+!FUTURE.md
+!CHANGELOG.md
+
+# Cache and logs
+.ai-chat-exporter/
+logs/
+*.log
+
+# Editor / OS
+.DS_Store
+.idea/
+.vscode/
+*.swp
+*.swo
+Thumbs.db