feat(taskflow): add core task API, storage persistence, csv export, stats page, and test coverage

.gitignore

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+# Python-generated files
+__pycache__/
+*.py[oc]
+build/
+dist/
+wheels/
+*.egg-info
+.pytest_cache/
+
+# Virtual environments
+.venv
+
+# Environment variables
+.env
+
+# AI artifacts
+ai_artifacts/
+
+# Data
+data/
+
+# Miscellaneous
+.DS_Store