feat(shell): initial decnet_behave_shell spec + tests
Shell-session behavioral observation registry layered on core. SPDX: GPL-3.0-or-later (code) / CC-BY-SA-4.0 (attribution-recipes.md).
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Shell-session behavioral observation registry layered on core. SPDX: GPL-3.0-or-later (code) / CC-BY-SA-4.0 (attribution-recipes.md).