Move entity rehydration to domain layer, fix tempHp gap

Rehydration functions (reconstructing typed domain objects from untyped
JSON) lived in persistence adapters, duplicating domain validation.
Adding a field required updating both the domain type and a separate
adapter function — the adapter was missed for `level`, silently dropping
it on reload. Now adding a field only requires updating the domain type
and its co-located rehydration function.

- Add `rehydratePlayerCharacter` and `rehydrateCombatant` to domain
- Persistence adapters delegate to domain instead of reimplementing
- Add `tempHp` validation (was silently dropped during rehydration)
- Tighten initiative validation to integer-only
- Exhaustive domain tests (53 cases); adapter tests slimmed to round-trip
- Remove stale `jsinspect-plus` Knip ignoreDependencies entry

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/domain/src/rehydrate-player-character.ts

@@ -0,0 +1,55 @@
+import type { PlayerCharacter } from "./player-character-types.js";
+import {
+	playerCharacterId,
+	VALID_PLAYER_COLORS,
+	VALID_PLAYER_ICONS,
+} from "./player-character-types.js";
+
+function isValidOptionalMember(
+	value: unknown,
+	valid: ReadonlySet<string>,
+): boolean {
+	return value === undefined || (typeof value === "string" && valid.has(value));
+}
+
+export function rehydratePlayerCharacter(raw: unknown): PlayerCharacter | null {
+	if (typeof raw !== "object" || raw === null || Array.isArray(raw))
+		return null;
+	const entry = raw as Record<string, unknown>;
+
+	if (typeof entry.id !== "string" || entry.id.length === 0) return null;
+	if (typeof entry.name !== "string" || entry.name.trim().length === 0)
+		return null;
+	if (
+		typeof entry.ac !== "number" ||
+		!Number.isInteger(entry.ac) ||
+		entry.ac < 0
+	)
+		return null;
+	if (
+		typeof entry.maxHp !== "number" ||
+		!Number.isInteger(entry.maxHp) ||
+		entry.maxHp < 1
+	)
+		return null;
+	if (!isValidOptionalMember(entry.color, VALID_PLAYER_COLORS)) return null;
+	if (!isValidOptionalMember(entry.icon, VALID_PLAYER_ICONS)) return null;
+	if (
+		entry.level !== undefined &&
+		(typeof entry.level !== "number" ||
+			!Number.isInteger(entry.level) ||
+			entry.level < 1 ||
+			entry.level > 20)
+	)
+		return null;
+
+	return {
+		id: playerCharacterId(entry.id),
+		name: entry.name,
+		ac: entry.ac,
+		maxHp: entry.maxHp,
+		color: entry.color as PlayerCharacter["color"],
+		icon: entry.icon as PlayerCharacter["icon"],
+		level: entry.level,
+	};
+}