release: v0.1.3 docs and GraphTrace integration

Add GraphTrace and RunScope for declarative graph-style tracing hierarchy

chore: bump version to 0.1.2

test: remove env-dependent tests, keep only business logic tests

fix: correct create_root to generate dotted_order and improve test isolation

fix: make config tests robust against .env file interference

chore: bump version to 0.1.1

fix: improve test isolation for config tests

fix: resolve test failures caused by singleton state and .env file interference

chore: clean up documentation structure

docs: move documentation files to docs/ directory

docs: add publication guide

chore: update Cargo.toml metadata for publication

docs: add publishing guide and quick start

docs: add comprehensive documentation