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Phase 3a emits a `leadership_status` observer frame per window-instance every 5s and handles a `claim_leadership` control frame. The desktop had no consumer. This adds the owner-side surface: a per-agent leader badge and a per-instance "Make leader" steal action. The frames already land in `eventsByAgent` via the owner-wide observer subscription, so leadership is a cached derivation rather than a new store. `getAgentLeadership` stays a stable map lookup (required by `useSyncExternalStore`); the `leadershipByAgent` array is rebuilt only when a leadership frame appends. Staleness stays out of the store — the row filters against a 5s clock so a crashed leader's badge drops within 15s without a new frame. The steal ack is non-authoritative: the UI converges off the stream, never optimistically flipping the badge. Co-authored-by: Will Pfleger <pfleger.will@gmail.com> Signed-off-by: Will Pfleger <pfleger.will@gmail.com>