Implement nose coupling so run-arounds work, and stop coupling wiping the district

test/sim.test.ts

@@ -276,15 +276,28 @@ describe('switching accomplishes something (regression)', () => {
     assert.ok(worstRun < 3, `crew oscillated ${worstRun + 1} times without doing any work`);
   });
 
-  it('does not spend its whole Local Operations budget on motion', () => {
-    // The absolute ratio is no longer a fair test: with only 9 industries in 115 cards there is
-    // often nothing to switch, so `work` is legitimately near zero. What still must hold is that
-    // the crew is not burning all six Moves every Stage — the shuttling bug.
+  it('does not shuttle aimlessly — Moves have to buy something', () => {
+    // Counting Moves alone stopped being a fair test once the crew could do real work. Run-arounds
+    // and sidings are SUPPOSED to cost several Moves each: the crew leaves the main, runs the loop,
+    // and comes back with a different car droppable. Measured before sidings existed the crew
+    // coupled ~0.4 cars a game; it now couples ~8 and drops ~11.
+    //
+    // So test the thing the old threshold was a proxy for: motion must convert into work. A crew
+    // that shuttles for its own sake shows a high ratio here, however few or many Moves it makes.
     const report = simulate({
       games: 40, length: 'standard', mode: 'solitaire', players: ['bot'], policy: developerBot,
     });
-    const moves = report.perGame.reduce((n, g) => n + g.actions.moves, 0) / report.perGame.length;
-    assert.ok(moves < 60, `${moves.toFixed(0)} Moves per game suggests aimless shuttling`);
+    const per = (f: (g: (typeof report.perGame)[number]) => number): number =>
+      report.perGame.reduce((n, g) => n + f(g), 0) / report.perGame.length;
+
+    const moves = per((g) => g.actions.moves);
+    const work = per((g) => g.actions.drops + g.actions.couples);
+    assert.ok(work > 2, `only ${work.toFixed(1)} productive acts a game — the crew is doing nothing`);
+    assert.ok(
+      moves / work < 8,
+      `${(moves / work).toFixed(1)} Moves per drop or coupling suggests aimless shuttling ` +
+        `(${moves.toFixed(0)} Moves, ${work.toFixed(1)} productive acts)`,
+    );
   });
 });