The onboarding card needs to list catalog plugins beside the hosted
connectors (NS-960 D1, D4) and grey a plugin whose app is absent (D5).
The catalog had no curated flag, and the manage_catalog row left
app_state empty.
- `onboarding: true` and `title` on catalog entries (loader, validator,
docs); set on blender, nvidia-app and nvidia-broadcast.
- hermes_cli/plugin_catalog_presence.py reads the plugin.json at the
catalog's pinned commit once per pin and judges its app declaration with
the hermes_platform resolver the installer and the Plugins-tab pill use.
No declaration or an unreadable one is `unknown`, never `present`.
- `plugins.manage action=onboarding` lists the curated entries this OS
runs (platform mismatch is the only exclusion) with app_state and the
sentence the card greys the row with.
- manage_catalog plugin rows now carry app_state and the catalog title.
- A live entry that differs from the in-tree entry at the same pin (new
metadata) now follows the same newer-catalog rule as a new pin, so a
checkout that adds `onboarding` is not masked by a published doc that
predates it.
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