Inkling 1.13.0

Plugins in consuming projects can now import their definition, types, and route guards from inkling/plugins. The existing plugin system remains compatible.

The documentation covers installation, route permissions, secret settings, lifecycle behavior, searchable Help, and the account menu. Inkling School is updated separately for nontechnical editors.

Validation: 289 local tests passed; type checking, formatting, and documentation validation passed. The Postgres suite and Pages deployment also passed in CI.