灼热 / 炽焰源石虫 keep their tinted alias: notes and a test on why no PRTS model download is used (#74)

No runtime change. Contributed by @Convey123.

docs/DESIGN.md

@@ -1259,7 +1259,7 @@ Eighteen workstreams (WA–WR, each on its own branch from master 7f13473) were
 
 ### 21.14 Special Originium slugs and 暴鸰's bomb (D3, D4) — `tools/local-extract/extract.py ENEMY_SPINES`, `tools/assets/local-enemy-spines.json`, `plan.mjs localEnemySpines`, `fetch-assets --local-spines`, `assets.js spineEntry`, `render/units.js ALIAS_TINT / FORMS`, `content/enemies.js kitBombd`, `snapshot.js form`, `style.js PROJ.droneBomb`
 
-- **D3** ("所有特殊源石虫的模型全表现为普通源石虫"), partly real: 高能 / 冰爆 / 简饲源石虫 and “庞贝” always had their own models; 灼热 / 炽焰源石虫 (enemy_1305_mhslim / _2, the ELEMENT slugs, up to 10 a round) were the plain 源石虫 — no web dump has their models (the asset plan aliases them); the official skeletons exist only in the client (refs/arts/enm_art_12.ab).
+- **D3** ("所有特殊源石虫的模型全表现为普通源石虫"), partly real: 高能 / 冰爆 / 简饲源石虫 and “庞贝” always had their own models; 灼热 / 炽焰源石虫 (enemy_1305_mhslim / _2, the ELEMENT slugs, up to 10 a round) were the plain 源石虫 — no web dump has their models (the asset plan aliases them); the official skeletons exist only in the client (refs/arts/enm_art_12.ab). Root cause located 2026-10-04: Ark-Models *indexes* `1305_mhslim` / `1305_mhslim_2` with an **empty `assetList`** (registered, never uploaded), so the alias chain falls to `enemy_1007_slime` — a different enemy rather than a variant of it. The *mobile* build ships their own model (`enemy_spine/<enemyId>/<enemyId>.{skel,atlas,png}`, straight-alpha pages), but its only public mirror is a community wiki and not a GitHub dump, so it is deliberately **not** an asset source (docs/ASSETS.md "Enemy aliases"): the tinted alias stays the web model until a GitHub dump carries these two.
 - **D3 now**: an optional overlay — the manifest keeps the alias as the web model and `enemies[id].spineLocal` names the files of the data/local-assets.json group `spine/enemy/<id>` with the metadata of the committed `tools/assets/local-enemy-spines.json` (data/assets.json is byte-identical with or without the extraction). The client draws the official model when the local manifest lists every file, else (or on a load failure) the web alias tinted toward the slug's own lava colours (`ALIAS_TINT`: 灼热 orange, 炽焰 red-orange, research 07 §5.6) [ASSUMED look]. The 0.1.1 release bundle carries the models (extracted with `node tools/setup.mjs --local`, the `spine/enemy` job). Audit (249 enemies vs the client's prefabs): no other enemy is drawn with another's model; 伊利昂的木驮兽 starts on skin `Full` in the game and is drawn with `default` (unchanged). `fetch-assets --prune` never deletes `public/assets/local` any more.
 - **D4** ("暴鸰的炸弹无法正常投放"), partly real: the bomb hit in the trigger tick, with no projectile, and stayed under the drone. **Official** (prefab enemy_1040_bombd / projectile_bombd; PRTS 暴鸰): Boomb plays Attack, the bomb leaves on OnAttack (frame 8) and flies homing at 5 tiles/s; the cast ends when the bomb is gone, ≥ 0.667 s after the release; buff bomb_s: the bomb-less mode S1 (*_2 clips) + speed ×2 ("技能结束后"); `_immuneStunWhenAffecting` 0.
 - **D4 now**: the drone holds still at the trigger; 8 ticks later (8/30 s) the release ('atk' droneBomb + the form 'bombed' — UnitInfo `form`); on landing the target 100 % ATK + the 8 tiles around 100 % splash (a target gone mid-flight: the bomb lands where it was; the drone's death after the release does not stop it); at max(landing, release + 0.667) ×2 speed and it flies on. A stun / freeze / sleep before the release interrupts the cast (no drop; the skill re-arms with its 1 s cooldown).