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From Emacs's review of #6378. All seven findings reproduced. The two blocking server bugs were the same shape: Mika is one agent per workspace but sessions and ownership are per member. - StartMikaOnboarding required the agent owner, so the member who lost the CreateMikaAgent race — the race that handler's advisory lock exists to survive — got a valid Mika, opened a valid session, and then a 403. Mika is created workspace-visible and workspace-invocable; the session gate and canInvokeAgent were already the checks that matter. - The onboarding session was resolved client-side by listing sessions and creating one on a miss, matched on the localized title. LockWorkspaceForChatSessionCreate is FOR KEY SHARE precisely so concurrent creators do not block, so two tabs each opened their own conversation with its own kickoff, and switching language between a failed attempt and its retry opened another. It is now get-or-create server-side under a per-(workspace, member) advisory lock, keyed on (workspace, creator, agent), returned alongside the agent. Also: - The skipped-runtime welcome dismissed itself silently when provisioning the guide issue failed. The signal is not persisted and onboarding is already complete, so a blip was terminal. It now offers a retry. - The Runtimes recovery card gated on `agents.length === 0`, so creating any ordinary agent hid the only surface that can mint a Mika — the generic endpoint accepts no system_key. Gated on Mika's absence. - CompactRuntimeRow ignored `disabled`; the CLI dialog was already passing it, so the runtime could change mid-submit. It is a real <button> now, which also gets focus and Enter/Space for free. - The rail never went below 15rem while the content pane kept its gutter, leaving ~87px of form at 375px. It is hidden under md, where a compact bar carries the step name and the Back button instead. - Dropped a stray __pycache__ artifact I had committed by accident. Each new test was checked against the bug it covers: reinstating the owner gate, the title-keyed lookup, or the dropped disabled prop makes the corresponding test fail. Co-authored-by: multica-agent <github@multica.ai>