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Close admission and join session, prompt, MCP and shell owners before acknowledging supported shutdown. Retain actual child exit evidence and lifetime uncertainty across initialization, respawn, cancellation and forced teardown. Install ACP shutdown ownership before startup and sign a local completion proof bound to the existing agent, community and launcher nonce. Native exact Stop requires verified proof plus successful retained-root/group teardown before recording Stopped. Unsupported, missing, forced or uncertain evidence stays replacement-blocking. The guarantee covers trusted Unix ACP/agent/dev-MCP shell process-group work, not detached daemons or external jobs. Legacy Desktop Stop UI and remote Start/Move integration remain separate. Validated package tests and all-feature clippy, workspace fmt, native default-feature clippy and execution/owner tests, native fmt, current binaries, real selected/peer process-chain teardown, whitespace and differential size gates. Native validation uses a source-only externalBin override, not packaging parity. Signed-off-by: Logan Johnson <loganj@squareup.com>