Step 10B.2: deadhead to any discovered location

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

DECISIONS.md

@@ -621,3 +621,9 @@ Implementation decisions not spelled out in `memory-bank/implementation-plan.md`
 ## Step 10B.1
 
 - **The board generator's input is `location`** (the freight market's location). Sim never knew about bays for boards; the old field name `origin` was the only "bay-board" naming, and comments now say "location board". Generation rules and seeds (`board:<location>:<period>`) are unchanged.
+
+## Step 10B.2
+
+- **Deadhead checks, in order:** ship idle, pilot idle, pilot assigned to the ship, destination not the current location (`already-there`), destination discovered (`location-undiscovered`), landing, range, fuel credits. Bays play no part.
+- **`no-bay-at-destination` is gone** from sim reasons and API error codes; `location-undiscovered` (already a server code) is now also a sim reason.
+- **The server change landed in this step** (it must pass `discoveredIds` to compile), so the Step 6.11 "no bay at destination" test became "undiscovered destination" here; Step 10B.5 adds the stranded-ship scenario.

apps/server/src/game/dispatch.ts

@@ -17,9 +17,9 @@ import { and, eq, sql } from "drizzle-orm";
 import type { Queryable } from "../db/client";
 import {
   acceptedContracts,
-  bays,
   companies,
   contractBoards,
+  discoveredLocations,
   dispatches,
   pilots,
   players,
@@ -246,7 +246,7 @@ export async function setInFlight(tx: Queryable, shipId: string, pilotId: string
     .where(eq(pilots.id, pilotId));
 }
 
-/** Flies a ship and its pilot empty to another player bay, paying fuel only (Step 6.11). */
+/** Deadhead: flies a ship and its pilot empty to another discovered location, paying fuel only (Steps 6.11, 10B.2). */
 export async function dispatchReposition(
   tx: Queryable,
   playerId: string,
@@ -257,16 +257,16 @@ export async function dispatchReposition(
   const pilot = await requireOwnPilot(tx, playerId, input.pilotId);
   const player = await requirePlayer(tx, playerId);
   const company = await requireCompany(tx, playerId);
-  const bayRows = await tx
-    .select({ locationId: bays.locationId })
-    .from(bays)
-    .where(eq(bays.playerId, playerId));
+  const discovered = await tx
+    .select({ locationId: discoveredLocations.locationId })
+    .from(discoveredLocations)
+    .where(eq(discoveredLocations.playerId, playerId));
 
   const proposal = {
     ship: shipState(ship),
     pilot: pilotState(pilot),
     destinationId: input.destinationId,
-    bayLocationIds: new Set(bayRows.map((b) => b.locationId)),
+    discoveredIds: new Set(discovered.map((d) => d.locationId)),
     credits: company.credits,
     now,
   };

apps/server/src/game/messages.ts

@@ -14,5 +14,5 @@ export const VALIDATION_MESSAGES: Record<DispatchFailure | RepositionFailure, st
   "contract-expired": "This contract has expired.",
   "insufficient-credits": "Not enough credits for fuel.",
   "already-there": "The ship is already there.",
-  "no-bay-at-destination": "You have no bay at that destination.",
+  "location-undiscovered": "You can only fly empty to places you have discovered.",
 };

apps/server/test/reposition.test.ts

@@ -48,17 +48,17 @@ describe("reposition dispatch", () => {
     expect(state.company.credits).toBe(10_000 - dispatch.fuelCost);
   });
 
-  it("refuses a destination without a player bay and changes nothing", async () => {
+  it("refuses an undiscovered destination and changes nothing", async () => {
     const { app } = testApp();
     const { guest, shipId } = await ownerWithMoonBay(false);
     const response = await call(app, guest, "POST", "/api/dispatches", {
       kind: "reposition",
       shipId,
       pilotId: guest.avatarId,
-      destinationId: "moon",
+      destinationId: "mars",
     });
     expect(response.statusCode).toBe(409);
-    expect(errorResponseSchema.parse(response.json()).error.code).toBe("no-bay-at-destination");
+    expect(errorResponseSchema.parse(response.json()).error.code).toBe("location-undiscovered");
     const state = await getState(app, guest);
     expect(state.company.credits).toBe(10_000);
     expect(state.ships[0]!.status).toBe("idle");

memory-bank/progress.md

@@ -135,7 +135,7 @@ Spec: `memory-bank/change-requests/CR-001-faster-start.md`. Decisions recorded a
 Spec: `memory-bank/change-requests/CR-002-open-markets.md`. New decisions recorded as plan §0.5.35–0.5.36.
 
 - [x] **Step 10B.1 — Sim: boards at any location.** `BoardInput.location` (was `origin`) is the board's location; no bay notion in sim board generation. Moon board test added.
-- [ ] Step 10B.2 — Sim: deadhead validation
+- [x] **Step 10B.2 — Sim: deadhead validation.** `validateReposition` takes `discoveredIds` (not bays): any origin, destination discovered (`location-undiscovered`) and not the current location, range and landing. `REPOSITION_FAILURES` swaps `no-bay-at-destination` for `location-undiscovered`. Server passes the player's discovered locations.
 - [ ] Step 10B.3 — Database: boards keyed by location
 - [ ] Step 10B.4 — Server: board endpoint for any discovered location
 - [ ] Step 10B.5 — Server: no more stranded ships

packages/sim/src/dispatch.ts

@@ -194,8 +194,8 @@ export interface RepositionProposal {
   ship: ShipState;
   pilot: PilotState;
   destinationId: string;
-  /** Locations where the player has a bay (bays exist only at discovered locations). */
-  bayLocationIds: ReadonlySet<string>;
+  /** Locations the player has discovered; only these can be deadheaded to (CR-002). */
+  discoveredIds: ReadonlySet<string>;
   credits: number;
   now: RealTime;
 }
@@ -206,7 +206,7 @@ export const REPOSITION_FAILURES = [
   "pilot-not-idle",
   "pilot-not-assigned",
   "already-there",
-  "no-bay-at-destination",
+  "location-undiscovered",
   "cannot-land",
   "out-of-range",
   "insufficient-credits",
@@ -216,21 +216,22 @@ export type RepositionFailure = (typeof REPOSITION_FAILURES)[number];
 export type RepositionCheck = { ok: true } | { ok: false; reason: RepositionFailure };
 
 /**
- * Validates an empty flight to one of the player's bays. Only range and landing
- * apply; no skills are needed (decision 0.5.24).
+ * Validates a deadhead (CR-002): an empty flight from wherever the ship is to
+ * any other discovered location. Only range and landing apply; no skills are
+ * needed (decision 0.5.24) and bays play no part.
  */
 export function validateReposition(
   proposal: RepositionProposal,
   content: SimContent,
 ): RepositionCheck {
-  const { ship, pilot, destinationId, bayLocationIds, credits, now } = proposal;
+  const { ship, pilot, destinationId, discoveredIds, credits, now } = proposal;
   const failWith = (reason: RepositionFailure): RepositionCheck => ({ ok: false, reason });
 
   if (ship.inFlight) return failWith("ship-not-idle");
   if (pilot.inFlight) return failWith("pilot-not-idle");
   if (pilot.assignedShipId !== ship.id) return failWith("pilot-not-assigned");
   if (destinationId === ship.locationId) return failWith("already-there");
-  if (!bayLocationIds.has(destinationId)) return failWith("no-bay-at-destination");
+  if (!discoveredIds.has(destinationId)) return failWith("location-undiscovered");
 
   const model = findShipModel(ship.modelId, content);
   const origin = findLocation(ship.locationId, content);

packages/sim/test/reposition.test.ts

@@ -9,7 +9,7 @@ import {
 } from "../src/index";
 
 const now = Date.parse("2100-01-01T00:30:00Z");
-const ship: ShipState = { id: "s1", modelId: "courier", locationId: "earth", inFlight: false };
+const atEarth: ShipState = { id: "s1", modelId: "courier", locationId: "earth", inFlight: false };
 const pilot: PilotState = {
   id: "p1",
   isAvatar: false,
@@ -17,11 +17,12 @@ const pilot: PilotState = {
   inFlight: false,
   skills: {},
 };
+/** No bays anywhere: deadheads depend only on discovery, range and landing (CR-002). */
 const valid: RepositionProposal = {
-  ship,
+  ship: atEarth,
   pilot,
   destinationId: "moon",
-  bayLocationIds: new Set(["earth", "moon"]),
+  discoveredIds: new Set(["earth", "moon"]),
   credits: 10_000,
   now,
 };
@@ -31,25 +32,34 @@ const reason = (proposal: RepositionProposal) => {
   return result.ok ? "valid" : result.reason;
 };
 
-describe("reposition", () => {
-  it("accepts an empty flight to a bay in range, with no skills needed", () => {
+describe("deadhead (fly empty)", () => {
+  it("lets a Courier idle at the Moon, with no Moon bay, deadhead to Earth", () => {
+    const atMoon = { ...atEarth, locationId: "moon" };
+    expect(reason({ ...valid, ship: atMoon, destinationId: "earth" })).toBe("valid");
+  });
+
+  it("needs no skills", () => {
     expect(reason(valid)).toBe("valid");
   });
 
-  it("fails validation when the destination has no player bay", () => {
-    expect(reason({ ...valid, bayLocationIds: new Set(["earth"]) })).toBe("no-bay-at-destination");
+  it("refuses an undiscovered destination with location-undiscovered", () => {
+    expect(reason({ ...valid, destinationId: "mars" })).toBe("location-undiscovered");
   });
 
-  it("still applies range and fuel checks", () => {
-    expect(
-      reason({ ...valid, destinationId: "mars", bayLocationIds: new Set(["earth", "mars"]) }),
-    ).toBe("out-of-range");
-    expect(reason({ ...valid, credits: 0 })).toBe("insufficient-credits");
-  });
-
-  it("rejects flying to where the ship already is, or with a busy or unassigned crew", () => {
+  it("refuses the ship's own location", () => {
     expect(reason({ ...valid, destinationId: "earth" })).toBe("already-there");
-    expect(reason({ ...valid, ship: { ...ship, inFlight: true } })).toBe("ship-not-idle");
+  });
+
+  it("refuses an out-of-range destination with the out-of-range reason", () => {
+    const discovered = new Set(["earth", "moon", "mars"]);
+    expect(reason({ ...valid, destinationId: "mars", discoveredIds: discovered })).toBe(
+      "out-of-range",
+    );
+  });
+
+  it("still needs fuel credits, an idle crew and an assigned pilot", () => {
+    expect(reason({ ...valid, credits: 0 })).toBe("insufficient-credits");
+    expect(reason({ ...valid, ship: { ...atEarth, inFlight: true } })).toBe("ship-not-idle");
     expect(reason({ ...valid, pilot: { ...pilot, inFlight: true } })).toBe("pilot-not-idle");
     expect(reason({ ...valid, pilot: { ...pilot, assignedShipId: null } })).toBe(
       "pilot-not-assigned",
@@ -58,7 +68,7 @@ describe("reposition", () => {
 
   it("creates a record with no contract, zero payout and a fuel charge", () => {
     const record = createRepositionRecord(
-      { id: "r1", ship, pilot, destinationId: "moon", now, worldSeed: 7 },
+      { id: "r1", ship: atEarth, pilot, destinationId: "moon", now, worldSeed: 7 },
       content,
     );
     expect(record.contract).toBeNull();