chore: initialize minions template repository

minions/plans/README.md

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+# Plans
+
+Use this folder for formal milestone plans, review plans, and closeout docs.
+
+## Good Plan Characteristics
+
+- clearly scoped
+- explicit owner view
+- current phase visible at the top
+- next review point visible at the top
+- exit criteria defined
+
+## Bad Plan Characteristics
+
+- vague success criteria
+- hidden scope changes
+- no owner
+- no review gate