Implement registry labeller and wire labels into install flows

[khoinguyenpham04]

This Roadmap discussion mirrors #1684: Implement registry labeller and wire labels into install flows.

Use this discussion to upvote the roadmap item and discuss priority, use cases, and product feedback. Keep implementation tracking, reproduction details, and PR-specific feedback on the source issue.

• Source issue: #1684
• Status: Open
• Labels: None
• Original author: ascorbic

Original Issue

Goal

The plugin registry needs a labeller so decentralized discovery has a usable trust and moderation layer.

Scope

Implement the reference labeller described by the registry RFC and wire label data into the aggregator and admin install experience.

Acceptance criteria

• A reference labeller can publish verification, warning, and takedown labels.
• Aggregator queries can filter or annotate results using accepted labellers.
• Admin browse/install surfaces label state clearly.
• Install/update policy respects takedown and trust labels.
• Documentation explains the labeller trust model.