* docs: document three-layer session ownership
User documentation for the session-ownership feature landed in #125057:
the immutable creator / assignable owner / participant-history model, the
Assign-to-me and Assign-to session menu actions, the sessions tool
assign_owner action, the sidebar Owners facet with Involving-me, the
pair-stack owner avatar, and agent-spawned session receipts (sessionUrl +
owner acknowledgement). Adds the sessions.assignOwner method and ownership
row projections to the protocol reference and a zh-CN glossary entry for
the new link label.
* docs: drop nonexistent header facepile overflow count
The chat header receives the already 4-capped participant projection and no
total count, so its overflow branch cannot render. Describe up to four
avatars instead (ClawSweeper P2).
Peter Steinberger
98d7b38d48
