Agent-first view: one continuous conversation per project, sessions hidden

[634634624]

Use case: I run one long-lived assistant per project (about 20, one per role). I want to open a project and talk to it as one continuous conversation, like a chat bot. Today every new session becomes a new thread in the sidebar, so each project ends up with a pile of near-identical threads that I archive by hand.

What I would like:

• A per-project option ("Agent mode" / "Single conversation").
• The sidebar shows one entry per project; opening it resumes the same conversation.
• New sessions, compactions and provider restarts happen under the hood and are not listed; old sessions stay reachable from a history view.
• Orchestrator child tasks (delegate_task) already stay out of the sidebar, which is the behaviour I want for the main conversation too.

Workaround today: one project and one thread per bot, idleCompaction: onReturn, manual archiving.

Related: #19657 (hidden subagent threads), #24342 (orchestrator MCP can't reorder threads). I found no existing request for this.