✨Feature: add creature lookup functionality and combat state management

src/rules/combat.test.ts

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+import { describe, expect, it } from "vitest";
+
+import { sampleContentPack } from "@/data/sampleContentPack";
+
+import { createStartingAdventurer } from "./character";
+import { startCombatFromRoom } from "./combat";
+import { createRoomStateFromTemplate } from "./rooms";
+
+describe("combat bootstrap", () => {
+  it("creates a combat state from a resolved guard encounter", () => {
+    const adventurer = createStartingAdventurer(sampleContentPack, {
+      name: "Aster",
+      weaponId: "weapon.short-sword",
+      armourId: "armour.leather-vest",
+      scrollId: "scroll.lesser-heal",
+    });
+    const room = createRoomStateFromTemplate(
+      sampleContentPack,
+      "room.level1.guard-room",
+      1,
+      "room.level1.normal.guard-room",
+    );
+    room.encounter = {
+      id: `${room.id}.encounter`,
+      sourceTableCode: "L1G",
+      creatureIds: ["a", "b"],
+      creatureNames: ["Guard", "Warrior"],
+      resultLabel: "Guard and Warrior",
+      resolved: true,
+    };
+
+    const result = startCombatFromRoom({
+      content: sampleContentPack,
+      adventurer,
+      room,
+      at: "2026-03-15T13:00:00.000Z",
+    });
+
+    expect(result.combat.id).toBe("room.level1.guard-room.combat");
+    expect(result.combat.actingSide).toBe("player");
+    expect(result.combat.player.name).toBe("Aster");
+    expect(result.combat.enemies.map((enemy) => enemy.name)).toEqual(["Guard", "Warrior"]);
+    expect(result.combat.enemies[0]?.armourValue).toBe(1);
+    expect(result.room.encounter?.rewardPending).toBe(true);
+    expect(result.logEntries[0]?.text).toContain("Guard and Warrior");
+  });
+
+  it("supports single-creature combat from a crate encounter", () => {
+    const adventurer = createStartingAdventurer(sampleContentPack, {
+      name: "Bryn",
+      weaponId: "weapon.short-sword",
+      armourId: "armour.leather-vest",
+      scrollId: "scroll.lesser-heal",
+    });
+    const room = createRoomStateFromTemplate(
+      sampleContentPack,
+      "room.level1.storage-area",
+      1,
+      "room.level1.normal.storage-area",
+    );
+    room.encounter = {
+      id: `${room.id}.encounter`,
+      sourceTableCode: "L1CE",
+      creatureIds: ["a"],
+      creatureNames: ["Giant Rat"],
+      resultLabel: "Giant Rat Pair",
+      resolved: true,
+    };
+
+    const result = startCombatFromRoom({
+      content: sampleContentPack,
+      adventurer,
+      room,
+      at: "2026-03-15T13:05:00.000Z",
+    });
+
+    expect(result.combat.enemies).toHaveLength(1);
+    expect(result.combat.enemies[0]?.sourceDefinitionId).toBe("creature.level1.giant-rat");
+    expect(result.combat.player.hpCurrent).toBe(10);
+  });
+
+  it("rejects rooms without combat-ready encounter names", () => {
+    const adventurer = createStartingAdventurer(sampleContentPack, {
+      name: "Cyra",
+      weaponId: "weapon.short-sword",
+      armourId: "armour.leather-vest",
+      scrollId: "scroll.lesser-heal",
+    });
+    const room = createRoomStateFromTemplate(
+      sampleContentPack,
+      "room.level1.small.empty",
+      1,
+      "room.level1.small.empty-space",
+    );
+    room.encounter = {
+      id: `${room.id}.encounter`,
+      creatureIds: [],
+      creatureNames: [],
+      resultLabel: "No encounter",
+      resolved: true,
+    };
+
+    expect(() =>
+      startCombatFromRoom({
+        content: sampleContentPack,
+        adventurer,
+        room,
+      }),
+    ).toThrow("combat-ready encounter");
+  });
+});

src/rules/combat.ts

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+import { findCreatureByName } from "@/data/contentHelpers";
+import type { ContentPack, CreatureDefinition } from "@/types/content";
+import type { AdventurerState, CombatState, CombatantState, RoomState } from "@/types/state";
+import type { LogEntry } from "@/types/rules";
+
+export type StartCombatOptions = {
+  content: ContentPack;
+  adventurer: AdventurerState;
+  room: RoomState;
+  at?: string;
+};
+
+export type StartCombatResult = {
+  combat: CombatState;
+  room: RoomState;
+  logEntries: LogEntry[];
+};
+
+function createLogEntry(
+  id: string,
+  at: string,
+  type: LogEntry["type"],
+  text: string,
+  relatedIds: string[],
+): LogEntry {
+  return {
+    id,
+    at,
+    type,
+    text,
+    relatedIds,
+  };
+}
+
+function createPlayerCombatant(adventurer: AdventurerState): CombatantState {
+  return {
+    id: adventurer.id,
+    name: adventurer.name,
+    hpCurrent: adventurer.hp.current,
+    hpMax: adventurer.hp.max,
+    shift: adventurer.stats.shift,
+    discipline: adventurer.stats.discipline,
+    precision: adventurer.stats.precision,
+    statuses: [...adventurer.statuses],
+    traits: ["player"],
+  };
+}
+
+function createEnemyCombatant(
+  room: RoomState,
+  creature: CreatureDefinition,
+  index: number,
+): CombatantState {
+  return {
+    id: `${room.id}.enemy.${index + 1}`,
+    name: creature.name,
+    sourceDefinitionId: creature.id,
+    hpCurrent: creature.hp,
+    hpMax: creature.hp,
+    shift: 0,
+    discipline: creature.attackProfile.discipline,
+    precision: creature.attackProfile.precision,
+    armourValue: creature.defenceProfile?.armour,
+    statuses: [],
+    traits: creature.traits ?? [],
+  };
+}
+
+function requireEncounterNames(room: RoomState) {
+  const creatureNames = room.encounter?.creatureNames?.filter(Boolean);
+
+  if (!room.encounter?.resolved || !creatureNames || creatureNames.length === 0) {
+    throw new Error(`Room ${room.id} does not have a combat-ready encounter.`);
+  }
+
+  return creatureNames;
+}
+
+export function startCombatFromRoom(
+  options: StartCombatOptions,
+): StartCombatResult {
+  const at = options.at ?? new Date().toISOString();
+  const creatureNames = requireEncounterNames(options.room);
+  const enemies = creatureNames.map((creatureName, index) =>
+    createEnemyCombatant(
+      options.room,
+      findCreatureByName(options.content, creatureName),
+      index,
+    ),
+  );
+
+  const combat: CombatState = {
+    id: `${options.room.id}.combat`,
+    round: 1,
+    actingSide: "player",
+    player: createPlayerCombatant(options.adventurer),
+    enemies,
+    combatLog: [
+      createLogEntry(
+        `${options.room.id}.combat.start`,
+        at,
+        "combat",
+        `Combat begins in ${options.room.id} against ${creatureNames.join(" and ")}.`,
+        [options.room.id, ...enemies.map((enemy) => enemy.id)],
+      ),
+    ],
+  };
+
+  const room: RoomState = {
+    ...options.room,
+    encounter: options.room.encounter
+      ? {
+          ...options.room.encounter,
+          rewardPending: true,
+        }
+      : undefined,
+  };
+
+  return {
+    combat,
+    room,
+    logEntries: [...combat.combatLog],
+  };
+}