What problem does it solve? It standardizes how agents and the founder interact with the Hub Pro decision form, enforcing a locked 5-slot question schema (choices A-D plus a free-text option 5) and a safe disk-first submit flow that avoids blocking the HTTP response. ## Core Features & Use Cases - Stable 5-slot schema: Every question row exposes 4 machine/agent choices plus an always-visible founder free-text slot, normalized via a single SSOT JSON schema. - Disk-first submit path: Applies picks synchronously in about 30ms, then runs reconcile, wire, judge, and governance steps in a background subprocess started after the HTTP response. - Founder-only guards: Requires founder_submit, hub_browser channel, and partial_batch support, with an agent-submit-forbidden flag to prevent misuse. - Use Case: An agent adds 2-4 answer choices to an open question; the machine appends slot 5, the founder picks options in the browser UI, and the submission is receipted to ~/.sina/hub-form-submit-receipt-v1.json. ## Quick Start Ask the agent to add two to four answer choices to an open question on the Hub Pro form, then verify the API returns five option slots per row.