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Implements Phase-1 of issue #4938: the harness now publishes kind-9 sentinel cards into the channel thread when a session/request_permission reaches the Ask policy arm, and edits them to resolved state (kind-40003) when the permission concludes. Sentinel publish system (buzz-acp): - Add relay_publisher, agent_relay_keys, agent_owner_pubkey_hex, turn_initiator_pubkey, sentinel_channel_id, sentinel_thread_reply_id fields to AcpClient; wired per-turn from pool.rs and lib.rs. - D7-final admission check: Ask only fires for owner-initiated turns when relay_publisher is present; non-owner turns silently downgrade to reject so no card is posted for unattended sessions. - kind-9 sentinel published after inserting the pending entry; event ID stored in PermissionEntry::sentinel_event_id for the edit. - kind-40003 resolved edit published in finish_permission Ok path; skipped when sentinel_event_id is None (relay-absent sessions). - Both publishes are fire-and-forget; permission flow never blocks on relay acceptance. - publish_event_acked / PublishEventAcked / AckOutcome scaffolding preserved for future acked-publish callers. Label fix (desktop): - describePermissionOutcome: accepts optionLabels (display strings) and optionKinds (for deny/approve verb only) as separate maps; never renders raw ACP kind strings to the user. - describePermissionTerminalReason: builds optionLabels from label ?? name fields; raw kind string falls back to verb-only ("Approved" / "Denied") when no display string is available. - Legacy key path passes empty labels map (verb-only fallback). Documentation (NIP-AO.md): - Permission Sentinel Cards section: kind-9/40003 lifecycle, D7-final admission check, D5 durable-rule disclosure, sentinel authenticity. Tests: - 736 + 9 buzz-acp unit tests pass (sentinel publish skipped via relay_publisher: None in test helpers; D7 gate bypassed when relay_publisher is None). - agentSessionTranscriptPermissions.test.mjs: 12 named tests for describePermissionOutcome and describePermissionTerminalReason. - computePermissionRequest.test.mjs: tests for sentinel card parser. - Updated expectations in agentSessionTranscript.test.mjs and ingestArchivedObserverEvents.test.mjs to match verb-only fallback. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>