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.
Switch triage agent to gpt-5.4-nano for faster issue assignment. Remove label
management from the triage tool so it only assigns owners based on team
ownership rules. This reduces noise in the issue tracker and ensures issues
get to the right team member immediately without unnecessary labels.
Update team structures to reflect current ownership and add script for
processing unassigned issues.