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The per-session scope the host half now reads had no writer. This is it: a crosshair on the composer tool row, present only in sessions running the facet preset, opening a panel that sets the focus and the paths allowed outside it. The gate is the session's own `agentPreset` projection rather than anything inferred from the URL or from the plugin being installed, so a control for a plugin that is not running never appears. It writes through the settings document — the same one the plugin card edits — because `settings.mutate` accepts a path under a volatile node and refuses anything else. That is what makes the split real rather than aspirational: the agent has no write path to `scopes`, and the panel's write is the only one that can widen a session. The panel also carries the mode details and the usage notes, which the preset picker's guide dialog cannot show for a preset no core package ships — its guide table holds four shipped ids and is looked up only for built-ins. Also adds `@deepseek-ai/dsh-client-ui-conversation` to the client half's inject list: registering into `conversation.input.left` is a dependency on the package that declares it, and `slots.inject` waits for a slot rather than creating one, so naming another package's slot without loading it first registers nothing — silently, because nothing errors.