feat(core): add plugin list endpoint

Adds a plugin.list HTTP endpoint that reports currently loaded plugins, wires it through protocol, server, and generated clients, and merges it into sdk-next's plugin API. Also updates the sample plugin to register a primary agent instead of a subagent for local testing.
This commit is contained in:
Dax Raad 2026-07-01 00:53:22 -04:00
commit 6a91a682e4
13 changed files with 998 additions and 883 deletions

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