fix(milestone): normalize STATE narrative after milestone completion

sdk/src/query/phase-lifecycle.ts

@@ -1841,6 +1841,22 @@ export const milestoneComplete: QueryHandler = async (args, projectDir, workstre
         null,
         `${version} milestone completed and archived`,
       );
+
+      const positionPattern = /(##\s*Current Position\s*\n)([\s\S]*?)(?=\n##|$)/i;
+      const closedPositionBody =
+        `\nPhase: Milestone ${version} complete\n` +
+        `Plan: —\n` +
+        `Status: Awaiting next milestone\n` +
+        `Last activity: ${today} — Milestone ${version} completed and archived\n\n`;
+      if (positionPattern.test(next)) {
+        next = next.replace(positionPattern, (_m, header) => `${header}${closedPositionBody}`);
+      }
+
+      next = next.replace(
+        /(##\s*Operator Next Steps\s*\n)([\s\S]*?)(?=\n##|$)/i,
+        `$1\n- Start the next milestone with /gsd-new-milestone\n\n`,
+      );
+
       return next;
     }, workstream);
   }