RHDH Plugin NFS Migration

Own the shape of a frontend plugin's extensions as it moves from the legacy frontend system to NFS. Discover what the plugin exports before changing anything, migrate one extension type at a time, and keep legacy consumers compiling until the user explicitly approves a breaking change.

Start here

1. Read the plugin's package.json, src/plugin.ts or src/plugin.tsx, route refs, API factories, exported components, and app-config.dynamic.yaml.
2. Read the workspace's own AGENTS.md or CLAUDE.md; repository rules beat anything written here.
3. List every discovered extension to the user before editing.
4. Inspect branch and status before modifying files, and protect uncommitted work.

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