test: assert events for the remaining action types

expand had no event assertion at all; build and mission-complete asserted
type/message but not the event's turn. Issue #11 requires every action type
to be covered with correct turn/type/message.

lib/game/missions.test.ts

@@ -185,6 +185,7 @@ describe('completion', () => {
     expect(reward.qty).toBe(2)
 
     const event = (await db.db.select().from(schema.events)).find((e) => e.type === 'mission' && /complete/i.test(e.message))!
+    expect(event.turn).toBe(4) // accept (1) + three scans (2–4); completion is written by the third scan
     expect(event.message).toContain('Scan 3 bodies')
   })
 

lib/game/ship.test.ts

@@ -111,6 +111,10 @@ describe('expandSystem', () => {
     expect(systemOf(state, 'HULL').capacity).toBe(BASE_CAPACITY + 1)
     expect((await db.db.select().from(schema.inventoryItems)).map((i) => [i.name, i.qty])).toEqual([['IRON ORE', 1]])
 
+    const event = (await db.db.select().from(schema.events)).find((e) => e.type === 'expand')!
+    expect(event.turn).toBe(1)
+    expect(event.message).toContain('HULL')
+
     await db.db.update(schema.shipSystems).set({ capacity: MAX_CAPACITY }).where(eq(schema.shipSystems.id, hullId))
     await expect(expandSystem(db, hullId)).rejects.toMatchObject({ status: 409 })
   })
@@ -144,6 +148,7 @@ describe('buildSystem', () => {
     expect(state.turn).toBe(1)
 
     const event = (await db.db.select().from(schema.events)).find((e) => e.type === 'build')!
+    expect(event.turn).toBe(1)
     expect(event.message).toContain('WEAPONS')
 
     await expect(buildSystem(db, 'WEAPONS')).rejects.toMatchObject({ status: 409 }) // already built