plan-milestone
Define the next milestone for a ytstack project: goal, exit criteria, rough size. Produces a milestone roadmap skeleton; slice-level detail comes from the next skill (slice-milestone).
Anti-Pattern: "This feature is too small for a milestone"
Every feature goes through this. A CSS tweak, a single bugfix, a config change -- all of them. "Small" features are where unexamined assumptions cause the most wasted work. The milestone can be minimal (one slice, two tasks), but yo
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