plugin-example-structkind

The reference structural kind-class plugin (kind:examplestructkind) — a plugin that serves a whole entity kind whose OpLoad returns a member tree the host folds into uf.Deploy.

Unlike the FLAT kind (candy/plugin-example-kind, whose body lands as opaque uf.PluginKinds), a structural kind declares Structural:true; its OpLoad returns a spec.Deploy (DeployNode) member tree that the host folds into uf.Deploy — the same map a builtin pod/group/candy decoder populates in-process — so the entity participates in deploy/check exactly like a builtin.

It also proves F5 authored-member input-threading: the authored resource-member children are pre-decoded host-side (the core buildDeployNode recursion) and threaded via op.Env, and the plugin attaches them to its reply — so the reconstructed uf.Deploy carries the authored members, not a synthesized stand-in.

The plugin is out-of-process only (not in compiled_plugins:), which is exactly the point: it is the witness that a plugin the loader was not built with can reconstruct an authored uf.Deploy member tree over the wire. It is the channel the group/pod/vm/kubernetes/local/android/candy externalizations reuse.

Compose the plugin candy, then author the kind:

- '@github.com/opencharly/plugin-example-structkind/candy/plugin-example-structkind:<tag>'

examplestructkind:
  marker: hello

• candy/plugin-example-structkind/ — the plugin module: plugin.go (the provider + NewProvider()/NewMeta() with Structural:true + the OpLoad member-tree reconstruction), schema/examplestructkind.cue (the self-contained #ExamplestructkindInput), cmd/serve/main.go.
• charly.yml — the root project manifest (discover: candy).
• .github/workflows/tag-on-merge.yml — CalVer tag + CHANGELOG/ on merge.

• Owning skill: /charly-internals:plugin — the plugin/provider model, including the structural kind class and the uf.Deploy fold. This candy carries no skill: entity of its own; the gap is tracked in opencharly/opencharly#291.
• opencharly/charly — the charly CLI.