CCT 0.2.4 — stop duplicate DM bodies on os idle wakes

Hotfix on 0.2.3. No other changes.

Fixed

• os: DM bodies were delivered twice when a DM started an idle session. Since
  Pi #10739 (os 1.3.x), a run started by pi.sendMessage(..., { triggerTurn: true })
  also fires before_agent_start, and the handler drafted the still-unconsumed batch
  again under a new nonce. It now skips that event when the starting message is its
  own cct-inbox batch. Older hosts are unaffected. Deliveries at tool boundaries and
  on human prompts were always single. Regression test in test-os-inbox-pump.ts.