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>

apps/web/src/persistence/export-import.ts

@@ -4,8 +4,8 @@ import type {
 	PlayerCharacter,
 	UndoRedoState,
 } from "@initiative/domain";
+import { rehydratePlayerCharacter } from "@initiative/domain";
 import { rehydrateEncounter } from "./encounter-storage.js";
-import { rehydrateCharacter } from "./player-character-storage.js";
 
 function rehydrateStack(raw: unknown[]): Encounter[] {
 	const result: Encounter[] = [];
@@ -21,7 +21,7 @@ function rehydrateStack(raw: unknown[]): Encounter[] {
 function rehydrateCharacters(raw: unknown[]): PlayerCharacter[] {
 	const result: PlayerCharacter[] = [];
 	for (const entry of raw) {
-		const rehydrated = rehydrateCharacter(entry);
+		const rehydrated = rehydratePlayerCharacter(entry);
 		if (rehydrated !== null) {
 			result.push(rehydrated);
 		}