v0.13.1

What's Changed

• feat: add data flow contracts — cross-channel coherence analysis by @vamsiramakrishnan in #87
• docs: add visual testing infrastructure plan for cookbooks and A2UI by @vamsiramakrishnan in #89
• research: five-layer decoupling plan for durable execution by @vamsiramakrishnan in #88
• chore(deps): bump https://github.com/astral-sh/ruff-pre-commit from v0.9.6 to 0.15.5 by @dependabot[bot] in #65
• chore(deps): update sphinx requirement from <9.0.0,>=7.0 to >=7.0,<10.0.0 by @dependabot[bot] in #64
• chore(deps): bump https://github.com/pre-commit/pre-commit-hooks from v5.0.0 to 6.0.0 by @dependabot[bot] in #62
• fix: resolve issues #21, #22, #27 and add design specs for #15, #16 by @vamsiramakrishnan in #90
• feat: add Prefect and DBOS execution backends, complete asyncio coverage by @vamsiramakrishnan in #91
• Add v0.13.1 changelog entries by @vamsiramakrishnan in #92

Full Changelog: v0.13.0...v0.13.1