Move module identity to our own Forgejo instance. All import paths
updated across 434 Go files, sub-module go.mod files, and go.work.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Adds FindByForgejoUser() to Spinner so dispatch matches issues
assigned to Forgejo users (Virgil, Claude, Charon) even when the
agent config key differs (e.g. Hypnos → forgejo_user: Claude).
Searches config key first (direct match), then ForgejoUser field.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>