PRD 1.13 r2: della-0011 F1 (owner on its own thread and a granted collaborator create or clear a session) and N1 (REQ-SESS-1 title) (Vikunja 463)

docs/prd/mosaic-stack.md

@@ -1121,10 +1121,11 @@ design `docs/plans/2026-10-21_t1-sessions.md`, 2c843d190 on `huey/t1-sessions-de
   user's thread it can't read, but no names, messages or summaries.
   (Design D4 and D6, tests T3 and T5. Q176 TARGET.md:104.)
 - **REQ-SESS-2.** Clear context ends one session and starts a fresh
-  successor for the same assistant. Only the thread's owning user, while
-  their write grant covers the thread, creates or clears a session. A
-  viewer, a share, the organization's owner on another user's thread and
-  an agent can't. Clear waits until the session stops at a turn boundary
+  successor for the same assistant. Two humans can create or clear a
+  session: the organization's owner on its own thread, subject to the
+  instance's policy, and a collaborator who owns the thread, while a
+  write grant still covers it. The organization's owner on another
+  user's thread, a viewer, a share recipient and an agent can't. Clear waits until the session stops at a turn boundary
   with no child running, and shows that it is clearing until then. It
   never force-stops a busy session. The old session's messages, results
   and run evidence stay as they are. Its workspace stays at its path with

packages/tasks/requirements.json

@@ -74,7 +74,7 @@
     { "id": "REQ-USER-4", "title": "A thread is private to its user unless shared read-only; a share never widens a grant and ends on revoke" },
     { "id": "REQ-LIFE-1", "title": "The user creates, launches, terminates, regenerates and deletes agents from the CLI and the Console" },
     { "id": "REQ-KILL-1", "title": "One human command or Console button stops all work, runs, Discord and launches on an instance until a human clears it" },
-    { "id": "REQ-SESS-1", "title": "Each session shows its lifetime count of completed compactions on pi and Claude Code; unknown is shown, never zero" },
+    { "id": "REQ-SESS-1", "title": "Each session shows its lifetime count of completed compactions on pi and Claude Code; an unproven count shows unknown" },
     { "id": "REQ-SESS-2", "title": "Clear context retires a session after a safe stop and starts a fresh successor with none of the old context" },
     { "id": "REQ-SESS-3", "title": "Every session start passes the launch checks: authority, route, revocation, kill switch, limits and admission" },
     { "id": "REQ-LIB-1", "title": "A library maps the user's writing repository onto universes, books, types and playgrounds; only the human changes it" },