Playbooks: document choosing the Python SDK version (v4 or v5)

[maximelb]

Playbooks can now run on the Python SDK v5, so this page no longer says v5 is unsupported.

• Replaces the "v4 only" warning with a note pointing to a new Python SDK version section.
• The new section covers the optional sdk_version field (absent, empty or "4" = v4; "5" = v5), what sdk is under each version, v5 specifics (JSON-serializable return value, is_interactive is v4-only, background work stops when playbook() returns) and a v5 example playbook.
• Adds a v5 version of the "call a playbook from Python" example, a v5 Infrastructure as Code example, and notes which packages exist for each SDK.

The v5 example playbook and the v5 calling example were run against a live organization before writing them here. mkdocs build --strict and markdownlint-cli2 pass locally.

The web app's SDK selector mentioned on the page ships with the next web app release.

🤖 Generated with Claude Code

[maximelb]

/lc-review