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Move multi-agent isolation from blunt daemon-side filtering to relay-side group scoping, so a session can adopt new tabs again (follow-popup, OAuth results, cross-session adopt-by-targetId) without ever seeing the user's or another agent's tabs. Relay (relay.rs): track client->group (announced via new local ABRelay.setGroup, or the first createTarget's agentGroup) and target->group (created tabs tagged from the createTarget reply; an explicit attachToTarget tags the target into the adopter's group = #21; a pop-up inherits its opener's group via openerTargetId). Target.getTargets returns ONLY the requesting client's group; a client that never announced a group (older daemon) gets the full list — fully backward-compatible. +5 unit tests. Daemon (browser.rs): announce_group() on connect sets relay_scoped. Adoption in discover/resync/adopt_newly_opened is re-enabled ONLY when relay_scoped; without it (launch / real CDP / older relay that didn't answer the announce) the daemon keeps strict daemon-side isolation. So this can't regress the 125/125 isolation. Extension (ab-connect 0.4.10): synthesized Target.attachedToTarget targetInfo now carries openerTargetId (pop-ups inherit opener's group) and abGroup (the tab-group title, so the relay re-attributes existing tabs after ITS own restart, since createTarget tagging won't re-run). tabScopeHints(). Back-compat verified live: new daemon + OLD relay -> announce fails -> relay_scoped=false -> strict fallback, open/eval/url all work. The new extension (publish to CWS, strip manifest key) activates follow-popup; relay+daemon ship now. 861 tests pass.