tool-design-sprint-prototype-plan

<!-- PM-Skills | https://github.com/product-on-purpose/pm-skills | Apache 2.0 --> # Design Sprint Prototype Plan (Thursday morning) Thursday is the prototype build day. This skill produces the morning planning artifact that makes the build run; it does NOT build the prototype itself. The skill assigns roles, locks the fidelity bar, drafts the Five-Act interview script, defines the trial-run gate, and confirms Friday participants. The actual building (Figma frames, slideware decks, role-play scripts, paper assemblies) is craft work the team owns through the rest of Thursday. Family contract: [`docs/reference/skill-families/design-sprint-skills-contract.md`](../../docs/reference/skill-families/design-sprint-skills-contract.md). This skill is a member of `design-sprint-skills`. ## When to Use - It is Thursday morning of the Design Sprint and Wednesday's storyboard is signed off. - The Friday participant tracker needs a Thursday-morning confirmation check; cancellations now trigger buffer activation. - The interview script needs to be drafted (or refined from a prior sprint's template) before the interviewer can mock-run it Thursday afternoon. - The team needs role assignments before parallel build work begins; ad-hoc assignment Thursday afternoon wastes 1-2 hours. ## When NOT to Use - Wednesday is not closed. Return to `tool-design-sprint-decide-and-storyboard`; without a locked storyboard, the prototype has no spec. - The team is trying to use this skill to build the pro...