feat: TS 构建管线、Spine 抓取器与 wallpapers/ 唯一真相来源

把项目从「手写 dist/」改成「wallpapers/ 是唯一真相来源，dist/ 由 pnpm build 生成」，
并补上配套的类型、门禁与抓取器。一次提交落地整条管线，因为拆开会留下不能构建的中间态。

- src/：运行时与模拟器源码（TS，strict），编译到 build/ 再拷进各分发
- tools/：build / dev / check-{syntax,paths,dist}，以及抓取器与回归门禁 tools/checks/
  （.scratch/ 下那批一次性脚本移入 tools/checks/ 并入库为长期门禁）
- wallpapers/：七档壁纸的源数据 + README.md（id/音频/预设的完整规范）
- docs/adr/0005-0008：构建管线与分发拓扑、模拟器契约、自包含 sim、每骨架资源布局
- .gitignore：排除 .scratch/ 的参考资料副本（上游 spine 整仓克隆 ~1.2 GB、
  抓取侦查数据 ~680 MB）与调试转储；这些是本地调查材料，补偿会让仓库无法克隆
- 归一化 .gitignore/CONTEXT.md 行尾（工作区 CRLF、索引 LF 造成的整文件假 diff）

同时修掉三档卡住构建的未完工壁纸：
- kv45 的 meta.json 里 id 还是抓取期场景名 scene_main，经 downloader promote 正名为 kv45
- shajin / zhigengniao_juheye 的 meta.json 误用了骨架描述文件（name/spine/animations/pages）、
  且都缺 preset.template.json；现按规范重建：骨架沉到 spines/<名>/（spine-ts 按 atlas 所在
  目录解析贴图页）、补上元数据与单骨架预设，并清掉 zhigengniao 骨架里指向作者机的绝对路径
- 顺带 promote 已在 sources.yml 里的 kv46（月升之前，与兽共舞）

pnpm check 五道门全绿：10 个分发 / 7 档壁纸 / 141 处引用自包含。

wallpapers/hsr/shajin/meta.json

@@ -0,0 +1,9 @@
+{
+  "id": "shajin",
+  "name": "砂金",
+  "title": "【崩坏：星穹铁道】砂金",
+  "description": "[b]官方活动页「挥掷千星的筹码」立绘[/b]\r\n[list]\r\n  [*]bgm 与音量可在壁纸设置中调整。\r\n  [*]自适应窗口比例，不同显示器下构图保持一致。\r\n[/list]\r\n来源：https://act.mihoyo.com/puzzle/hkrpg/e20260807version_847959e2a2/index.html?game_biz=hkrpg_cn&mhy_presentation_style=fullscreen&mhy_landscape=true&mhy_hide_status_bar=true&mode=fullscreen&win_mode=fullscreen",
+  "audio": {
+    "choices": []
+  }
+}

wallpapers/hsr/shajin/preset.template.json

@@ -0,0 +1,8 @@
+{
+  "backgroundImage": "./scene/bg.jpg",
+  "spineConfig": {
+    "jsonUrl": "./spines/shajin/shajin.json",
+    "atlasUrl": "./spines/shajin/shajin.atlas",
+    "animation": "animation"
+  }
+}

wallpapers/hsr/shajin/spines/shajin/shajin.json

@@ -0,0 +1 @@
+{"skeleton":{"hash":"4RLeGDcnqnw","spine":"4.0-from-4.1-from-4.2-from-4.3.23","x":-126.83862,"y":-20.219086,"width":1200.8923,"height":1184.3547,"images":""},"bones":[{"name":"root"},{"name":"bone263","parent":"root","x":468.56265,"y":539.7488,"scaleX":0.29,"scaleY":0.29},{"name":"bone","parent":"bone263","length":881.09,"rotation":90,"x":-56.1079,"y":210.07495},{"name":"bone88","parent":"bone","length":881.13,"rotation":-90},{"name":"bg","parent":"bone88","x":-269.27,"y":-701.78},{"name":"chair","parent":"bone88","rotation":-16.8,"x":-327.04,"y":-676.43},{"name":"bone2","parent":"chair","rotation":16.8,"x":340.36,"y":344.78},{"name":"bone3","parent":"bone2","length":328.96,"rotation":115.11},{"name":"bone4","parent":"bone3","length":343.71,"rotation":-7.78,"x":328.96},{"name":"bone5","parent":"bone4","length":143.03,"rotation":-39.31,"x":343.71},{"name":"bone6","parent":"bone5","length":266.39,"rotation":-17,"x":143.03},{"name":"bone7","parent":"bone4","length":228.57,"rotation":-84.34,"x":238.48,"y":-43.56},{"name":"bone8","parent":"bone7","length":451.45,"rotation":-45.03,"x":226.72,"y":2.17},{"name":"bone9","parent":"bone8","length":426.31,"rotation":125.66,"x":451.45},{"name":"bone10","parent":"bone9","length":137.35,"rotation":-43.65,"x":424.5,"y":0.44},{"name":"bone11","parent":"bone10","length":45.69,"rotation":100.48,"x":108.72,"y":-48.4},{"name":"bone12","parent":"bone11","length":39.72,"rotation":16.29,"x":45.69},{"name":"bone13","parent":"bone12","length":41.16,"rotation":13.47,"x":39.72},{"name":"bone14","parent":"bone10","length":64.24,"rotation":82.56,"x":136.98,"y":-37.29},{"name":"bone15","parent":"bone14","length":42.3,"rotation":29.78,"x":64.24},{"name":"bone16","parent":"bone15","length":40.88,"rotation":3.72,"x":42.3},{"name":"bone17","parent":"bone10","length":65.76,"rotation":57.95,"x":146.88,"y":-26.17},{"name":"bone18","parent":"bone17","length":50.53,"rotation":58.23,"x":65.84,"y":-0.42},{"name":"bone19","parent":"bone18","length":42.49,"rotation":3.86,"x":50.53},{"name":"bone20","parent":"bone10","length":61.77,"rotation":31.61,"x":161.14,"y":-8.93},{"name":"bone21","parent":"bone20","length":43.66,"rotation":43.95,"x":60.65,"y":0.6},{"name":"bone22","parent":"bone21","length":39.66,"rotation":0.05,"x":43.27,"y":0.4},{"name":"bone23","parent":"bone10","length":46.96,"rotation":20.33,"x":83.08,"y":63.82},{"name":"bone24","parent":"bone23","length":50.33,"rotation":3.46,"x":46.24,"y":-0.14},{"name":"bone25","parent":"bone10","length":147.43,"rotation":16.83,"x":115.03,"y":72.87},{"name":"bone26","parent":"bone25","rotation":9.6,"x":147.8,"y":52.24},{"name":"bone27","parent":"bone25","rotation":4.8,"x":141.34,"y":-61.49},{"name":"bone28","parent":"bone25","rotation":-4.8,"x":150.75,"y":-1.64},{"name":"bone29","parent":"bone25","length":24.74,"rotation":-38.31,"x":179.74,"y":-68.86},{"name":"bone30","parent":"bone29","length":23.83,"rotation":-75.83,"x":7.62,"y":-13.46},{"name":"bone31","parent":"bone29","length":21.04,"rotation":87.85,"x":-1.19,"y":17.11},{"name":"bone32","parent":"bone25","length":35.98,"rotation":-137.12,"x":163.46,"y":-75.06},{"name":"bone33","parent":"bone32","length":31.22,"rotation":-1.91,"x":35.98},{"name":"bone34","parent":"bone25","length":48.43,"rotation":-128.8,"x":170.22,"y":-107.08},{"name":"bone35","parent":"bone34","length":40.74,"rotation":-24.57,"x":48.43},{"name":"bone36","parent":"bone25","length":34.85,"rotation":-53.44,"x":177.87,"y":-96.69},{"name":"bone37","parent":"bone36","length":31.8,"rotation":-12.82,"x":35.13,"y":0.67},{"name":"bone38","parent":"bone25","length":33.79,"rotation":-36.59,"x":197.87,"y":-73.7},{"name":"bone39","parent":"bone38","rotation":34.06,"x":-109.31,"y":13.62},{"name":"bone40","parent":"bone25","length":56.92,"rotation":-11.07,"x":204.18,"y":-28.55},{"name":"bone41","parent":"bone40","length":48.65,"rotation":-15.92,"x":56.18,"y":0.04},{"name":"bone42","parent":"bone25","length":34.63,"rotation":52.24,"x":205.2,"y":-2.76},{"name":"bone43","parent":"bone25","length":39.63,"rotation":51.13,"x":215.93,"y":20.67},{"name":"bone44","parent":"bone43","length":39.15,"rotation":37.01,"x":39.63},{"name":"bone45","parent":"bone42","length":29.37,"rotation":87.41,"x":11.31,"y":13.77},{"name":"bone46","parent":"bone42","length":28.3,"rotation":-81.95,"x":16.53,"y":-21.36},{"name":"bone47","parent":"bone4","length":76.01,"rotation":163.63,"x":149,"y":29.62},{"name":"bone48","parent":"bone4","length":54.21,"rotation":-170.18,"x":154.6,"y":7.96},{"name":"bone49","parent":"bone4","length":50.38,"rotation":135.87,"x":167.07,"y":43.77},{"name":"bone50","parent":"bone4","length":303.67,"rotation":80.39,"x":251.76,"y":-7.89},{"name":"bone51","parent":"bone50","length":394.37,"rotation":68.82,"x":303.67},{"name":"bone52","parent":"bone51","length":360.86,"rotation":-37.04,"x":391.86,"y":-1.39},{"name":"bone53","parent":"bone52","length":140.47,"rotation":19.47,"x":358.78,"y":-0.93},{"name":"bone54","parent":"bone53","length":62.08,"rotatiLine truncated