Read-only inventory of the add-ons compiled into the build — name, version,
id, API level, description, command prefixes — built from the extracted
`ocs_plugin_api` manifest. Opened with the `PLUGINS` / `PLUGINMANAGER` command
or the Start-page "Plugins" button.
Adds `installed_manifests()` to the plugin registry and wires the window the
same way as the existing About / Shortcuts windows.
Part of #100 (phase-1 plugin manager UI stub).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Move the dependency-free, semver-versioned half of the plugin contract into a
standalone workspace crate `crates/ocs_plugin_api`:
- manifest types: PluginManifest, ApiVersion, API_VERSION
- ribbon vocabulary: CadModule trait + ToolDef/RibbonGroup/RibbonItem/IconKind/
ModuleEvent/StyleKey
The host re-exports them from `crate::plugin::manifest` and `crate::modules`, so
every existing call site is unchanged. The acadrust-typed runtime surface
(HostSession) stays in the host binary; lifting it behind a HostApi trait in the
same crate is the remaining phase-1b step.
Part of #100. Docs updated in docs/plugin-architecture.md.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>