Prefect 3.7: infrastructure decorators and plugins are GA

Infrastructure decorators are generally available. Declare where a flow runs next to the flow itself, no separate deployment configuration required. (#21784)

The plugin system is generally available. Extend Prefect with your own integrations using the same mechanism our official ones use. (#21787)

Also in this release:

Flows can draw themselves. flow.generate_mermaid_graph() renders a flow's dependency graph with no extra dependencies, and the UI now renders Mermaid diagrams inside Markdown blocks.#21786 #21793

Set result storage once. Servers can define default result storage, resolved at runtime, so individual flows no longer need to repeat it.#21532

Faster, reproducible environments. Prepared pyproject workspaces run with uv.#21801

Smaller touches. A per-browser UI version switcher, block schema reads without the O(N²) checksum scan, and a warning when nested ThreadPoolTaskRunner submissions would deadlock.

The full release notes cover every change, including bug fixes.