Changelog

Add HeadlessPluginBase to PrivStack.Sdk — an abstract IAppPlugin

implementation with no-op defaults for UI methods (CreateViewModel,

navigation, etc.). Headless plugin assemblies extend this to provide

services, capabilities, and API routes without Avalonia dependencies.

Update HeadlessPluginRegistry to prioritize .Headless.dll assemblies

(sorted first in scan order) so they load before their full Avalonia

counterparts. Plugin ID deduplication prevents double-loading.

Update run-server.sh to build .Headless plugin projects in a first

pass, then skip full plugins that have a headless variant.

Points at test-data/ by default (same DB as build.sh --run --with-plugins).

Use --live for the system data directory, --workspace to skip the picker.

When starting without --workspace, the server now:

• Single workspace: auto-selects it
• Multiple workspaces: shows an interactive numbered menu
• No workspaces: offers to create one
• Non-interactive (piped stdin): uses active workspace or errors

Also lists available workspace names when --workspace doesn't match.

HeadlessPluginRegistry's constructor created PluginHostFactory eagerly,

which resolved IPluginRegistry from DI — causing a circular dependency

deadlock (DI was still constructing HeadlessPluginRegistry itself).

Fix: lazy-initialize PluginHostFactory on first use via a property.

Also switch HeadlessHost to call DiscoverAndInitializeAsync() directly

instead of the sync wrapper that used .GetAwaiter().GetResult(), and

wrap GetExportedTypes() in try-catch for ReflectionTypeLoadException

to handle assemblies with unresolvable type dependencies gracefully.