HSDD Milestone: Stakeholder Checkpoints With Demos and Gates

Generate the milestone document: the project's progress checkpoints as stakeholders see them — each a demo plus a measurable gate — with the launch window and the externally-gated contingent tail. Re-baseline it when reality moves the dates.

Core principle: a milestone is something a stakeholder can watch work, gated by checks that answer yes or no. Internals ("module X complete") are not milestones; unmeasurable gates are not gates. And the document cites, never defines — every number traces to the phase plans and the latest progress report.

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