Entrega v1 aula: shell com abas, PITIUPI_HOME e plugins de referência.

Consolida núcleo (presença, peer actions, MessageDispatcher), chat e screencast na galeria, documentação PT-BR e testes JUnit; remove mpChat do catálogo em favor do chat unificado.

Co-authored-by: Cursor <cursoragent@cursor.com>

plugins/screencast/.idea/ant.xml

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plugins/screencast/.idea/misc.xml

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plugins/screencast/.idea/pitiupi.screenCast.iml

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plugins/screencast/.idea/workspace.xml

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