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## Summary PR #6732 taught the ACP harness to honor `BUZZ_ACP_SESSION_POLICY`, but the desktop exposed that policy as one global experiment. Turning it on changed every managed agent at once, even though conversation scope is part of how an individual agent should behave. Some agents need continuity across a channel, while agents such as validators may need clean context for each thread. This moves the choice onto the agent definition under Advanced as **Conversation context**, with **Entire channel** and **Each thread** options. **Entire channel** remains the default, so existing definitions keep their current behavior. The policy now travels through create and update IPC, returned agent summaries, persona events, snapshots, teams, and community catalog copies. Launches pass the effective definition value to the harness. Editing a running agent uses the same lifecycle as a model edit: it shows the restart-required state, leaves the deployed process untouched, and applies the new policy on restart. The global Thread Scoped ACP Sessions experiment and its desktop command/state have been removed because the setting no longer has a useful global meaning. There is intentionally no migration for the old preview override. Users who enabled it can choose **Each thread** for the agents that need it. Unknown or null policy values degrade to **Entire channel** across stored agents, persona events, and catalog projections. This keeps forward-version data from dropping complete agent records. ### Related issue No matching issue found. Builds on #6732. ### Testing - Focused Playwright create flow selected **Each thread** and verified `create_persona` received `sessionPolicy: "thread"`. - Focused Playwright catalog flow added a thread-scoped agent and verified the local copy stored `session_policy: "thread"`. Generated with Codex --------- Signed-off-by: Salman Mohammed <smohammed@squareup.com>