master now rejects the @deepseek-ai/dsh-experimental- prefix for new
experimental packages, so the unreleased sidebar terminal backend becomes
@deepseek-ai/dsh-terminal-panel with plugin name terminal-panel, and its
directory joins EXPERIMENTAL_PACKAGE_NAME_EXCEPTIONS. The terminal bundle,
root devDependencies, generators, catalogs, snapshot composition and
upgrade guide use the new name; the hand-written tsconfig alias gives way
to the generated one.