feat(routines): ZZZ's Shiyu Defense and Deadly Assault

Both every two weeks on alternating Fridays, ticked once a cycle,
anchored on the owner's in-game readings: Shiyu rolled 2026-10-16,
Deadly Assault rolls a week later.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/superpowers/specs/2026-10-14-built-in-routines-design.md

@@ -249,7 +249,7 @@ Looked for on 2026-10-14 and not shipped. Each is a candidate the owner may know
 | Endfield | Protocol Pass weekly missions | Missions change every week; no fixed target or EXP cap stated, and the owner found none in game (2026-10-14) |
 | Endfield | Algorithmic Memories, Credit Store, Arsenal Exchange | No figure; Beta-era; daily store; a shop rotation, not a chore |
 | Nikki | Merit Arena, Pinnacle Contest | No wiki page (2026-10-16); Merit Arena's weekly caps change per version and only a fan account gives numbers; Pinnacle Contest runs in half-month periods → sub-project 2 |
-| ZZZ | Shiyu Defense, Deadly Assault | Multi-week cycles → sub-project 2; the owner's in-game dates are in § Scope |
+| ZZZ | Shiyu Defense, Deadly Assault | Multi-week cycles → sub-project 2; the owner's in-game dates are in § Scope. **Shipped 2026-10-16** as two-week cycle built-ins ([cycle routines spec](2026-10-16-cycle-routines-design.md)) |
 | Wuwa | Oscillated Coral exchange (gacha pulls) | Resets with each version update, not a week or month — the owner confirmed this in game, 2026-10-16. A dated window → sub-project 3 (§ Scope) |
 | Wuwa | Afterglow Coral exchange, Souvenir Stores, Tactical Hologram shops | No limit, or no stated reset |
 | Wuwa | Simulation Training, Forgery | Cost Waveplates; no weekly cap |

src/shared/routines.ts

@@ -357,6 +357,31 @@ export const ROUTINES: readonly Routine[] = [
     checked: "2026-10-16",
     note: "Bought with Bangbucks, 5 a month per the wiki; Boopons pay for Bangboo pulls. Confirmed in game, 2026-10-16.",
   },
+  // The two endgame modes alternate Fridays, each every two weeks. Anchors are
+  // the owner's in-game readings (2026-10-16): Shiyu rolled that day, Deadly
+  // Assault a week later.
+  {
+    id: "routine:zzz:shiyu-defense",
+    game: "zzz",
+    title: "Shiyu Defense",
+    period: { unit: "cycle", days: 14, from: "2026-10-16" },
+    measure: { kind: "days", required: 1 },
+    source: "https://zenless-zone-zero.fandom.com/wiki/Shiyu_Defense/Critical_Node",
+    asOf: "2026-01-02",
+    checked: "2026-10-16",
+    note: "Critical Node. Fridays, alternating weeks with Deadly Assault.",
+  },
+  {
+    id: "routine:zzz:deadly-assault",
+    game: "zzz",
+    title: "Deadly Assault",
+    period: { unit: "cycle", days: 14, from: "2026-10-23" },
+    measure: { kind: "days", required: 1 },
+    source: "https://zenless-zone-zero.fandom.com/wiki/Deadly_Assault",
+    asOf: "2026-07-31",
+    checked: "2026-10-16",
+    note: "Fridays, alternating weeks with Shiyu Defense.",
+  },
 
   // Arknights: Endfield.
   {

test/routines.test.ts

@@ -83,6 +83,8 @@ describe("ROUTINES", () => {
       ["Signal Shop: Encrypted Master Tapes", { unit: "month", startsOn: 1 }, { kind: "amount", target: 5, unit: "tapes" }],
       ["Signal Shop: Master Tapes", { unit: "month", startsOn: 1 }, { kind: "amount", target: 5, unit: "tapes" }],
       ["Signal Shop: Boopons", { unit: "month", startsOn: 1 }, { kind: "amount", target: 5, unit: "Boopons" }],
+      ["Shiyu Defense", { unit: "cycle", days: 14, from: "2026-10-16" }, { kind: "days", required: 1 }],
+      ["Deadly Assault", { unit: "cycle", days: 14, from: "2026-10-23" }, { kind: "days", required: 1 }],
     ]);
     expect(shape("endfield")).toEqual([
       ["Weekly Routine", week, { kind: "amount", target: 10, unit: "points" }],