refactor(entities): polimorfisme per substituir dynamic_casts
Quatre virtuals nous a `Entity` capten decisions que abans vivien al manager com a discriminacions de tipus: - `onWhipHit(WhipAttack*)` → bool. Default no-op/false. Override a `Mummy` per entrar HURT si és whippable. WhipAttack::applyDamage passa de `dynamic_cast<Mummy*>` + `isWhippable()` a una crida polimòrfica neta. RollingRock no override → immune al látigo per disseny, sense flag. - `onJustSpawned()`. Default no-op. Override a `DynamicHazard` per disparar `triggerSpawnExit()`. `spawnPendingActors` i `spawnActor` passen de `dynamic_cast<DynamicHazard*>(observer)->triggerSpawnExit()` a `observer->onJustSpawned()`. - `onRemoved()`. Default no-op. Override a `Sarcophagus` per cridar `entity_manager_->onSarcophagusRemoved()`. `removeEntity` passa de `getName() == "sarcophagus"` a dispatch polimòrfic. - `shouldReceiveContact()`. Default `collides() || triggersOnOverlap()`. Override a `DynamicHazard` per excloure SPAWN. `checkPlayerCollisions` passa de tres condicions inline per a sacs distints a una crida unificada. `whipDirToMummyDir` es mou de whip_attack.cpp a mummy.cpp — el mapping viu on s'usa (dins de `Mummy::onWhipHit`). `hitMummyIfApplicable` es renomena a `hitEntityIfApplicable`: ja no discrimina tipus, aplica `entity->onWhipHit` i marca `already_hit_` segons el retorn. Comportament idèntic, tests verds. Aquest commit prepara el següent: amb el polimorfisme madurat, el sac dual ja no aporta valor i podem tornar a un únic `entities_`.
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@@ -43,6 +43,7 @@ class Sarcophagus : public Interactable {
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void update(float delta_time) override;
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void notifyTilePainted(int col, int row) override;
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void onRemoved() override;
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[[nodiscard]] auto getState() const -> State { return state_; }
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[[nodiscard]] auto getPerimeterSize() const -> std::size_t { return perimeter_tiles_.size(); }
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