UltraPlan Third Execution Context

Description

Architectural clarification of UltraPlan: it adds a third execution context separate from local terminal and local session. Cloud Opus 4.6 drafts the plan, then either executes remotely or 'teleports' back to terminal. Teleport mechanism: cloud session serializes the plan, sends it as a webhook to the waiting (polling) CLI, then archives the cloud session so it does not continue working in parallel — eliminating the race condition where both contexts try to implement the same plan.

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src-20260419-392eceac3ff7