Function scaffold_plugin 

pub fn scaffold_plugin(
    name: &str,
    project_root: &Path,
    local_umbral_repo: Option<&Path>,
) -> Result<ScaffoldReport, ScaffoldError>

Write a richer plugin scaffold at <project_root>/plugins/<name>/ targeted at distributable / reusable plugins (third-party crates you’d publish or share across projects). Layout:

plugins/<name>/
├── Cargo.toml         — deps: umbral, serde, sqlx, chrono, async-trait
├── README.md          — what this plugin does, how to wire it
└── src/
    ├── lib.rs         — Plugin trait impl, glues models + routes
    ├── models.rs      — one example Model showing common field types
    │                    (Text + max_length, Choice enum, optional DateTime)
    └── handlers.rs    — one example axum handler using AppContext

This is the one plugin scaffolder. startapp / scaffold_app are a deprecated alias that forward here — everything generated under plugins/ is a plugin, so there is no separate “app” template.