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The plugin-list tab rendered one flat list of every Loader entry — no separate "system plugins" section — with each card showing its real enabled state and an enable/disable button (a required plugin shows only a read-only note). The enable/disable guard flipped from default-protect to default-open: only the small REQUIRED_PLUGINS core (entry tree, Remote RPC spine, session/agent spines) is protected from being disabled, so the shipped plugins are actually toggleable. Tests, host READMEs, and the enable-disable agent note track the new grouping and guard. Co-Authored-By: Claude <noreply@anthropic.com>