Drop three pieces that change behaviour beyond plugin skills:
- _session_home_scope binding the full runtime scope (secret hydration, which
can run external secret CLIs, and terminal policy) on every catalog,
completion and dispatch RPC: a cross-cutting change for all callers.
- slash.exec moving plugin commands ahead of the skill/bundle gate: a separate
precedence question that predates plugin skills.
- commands.catalog filing every skill under a new Skills category.
Plugin skills still list, complete and dispatch under the existing home scope.
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