docs: clarify menu bar sessionKey usage

CHANGELOG.md

@@ -69,6 +69,7 @@
 - Onboarding/Config: add protocol notes for wizard + schema RPC.
 - Queue: clarify steer-backlog behavior with inline commands and update examples for streaming surfaces.
 - Sandbox: document per-session agent sandbox setup, browser image, and Docker build.
+- macOS: clarify menu bar uses sessionKey from agent events.
 
 ## 2.0.0-beta5 — 2026-01-03
 

docs/mac/menu-bar.md

@@ -11,7 +11,7 @@ read_when:
 - The “Nodes” block in the menu lists **devices** only (gateway bridge nodes via `node.list`), not client/presence entries.
 
 ## State model
-- Sessions: events arrive with `runId` (session key). The “main” session is the key `main`; if absent, we fall back to the most recently updated session.
+- Sessions: events arrive with `runId` (per-run) plus `sessionKey` in the payload. The “main” session is the key `main`; if absent, we fall back to the most recently updated session.
 - Priority: main always wins. If main is active, its state is shown immediately. If main is idle, the most recently active non‑main session is shown. We do not flip‑flop mid‑activity; we only switch when the current session goes idle or main becomes active.
 - Activity kinds:
   - `job`: high‑level command execution (`state: started|streaming|done|error`).