Claude Code System Prompts

@internal Plugin authoring feedback (e.g., a default folder shadowed by a manifest key). When plugin matches an entry in plugins[], that plugin loaded and the warning is advisory; warnings with a synthetic plugin source (no matching plugins[] entry, e.g. workspace-level suppression notices) describe content that did NOT load. The key is omitted when there are no warnings. On connections that persist frames server-side (the local bridge-worker lane) this key is always omitted — plugin diagnostics stay in the local log, so an omitted key there does NOT assert a clean load.