🔧 chore(thirdparty): generalize skills sync pipeline

replace the superpowers-only workflow with a manifest-driven pipeline
sync ui-ux-pro-max into codex/skills and document source lists
fix the prettier path test so the Python suite passes on Windows

.gitea/ci/thirdparty_skills.json

@@ -0,0 +1,26 @@
+{
+  "sources": [
+    {
+      "id": "superpowers",
+      "upstream_repo": "https://github.com/obra/superpowers.git",
+      "upstream_ref": "main",
+      "snapshot_dir": "superpowers",
+      "sync_mode": "copy_skill_dirs",
+      "source_list": "codex/skills/.sources/superpowers.list",
+      "skills_subdir": "skills"
+    },
+    {
+      "id": "ui-ux-pro-max",
+      "upstream_repo": "https://github.com/nextlevelbuilder/ui-ux-pro-max-skill.git",
+      "upstream_ref": "main",
+      "snapshot_dir": "ui-ux-pro-max",
+      "sync_mode": "render_codex_skill",
+      "source_list": "codex/skills/.sources/ui-ux-pro-max.list",
+      "output_name": "ui-ux-pro-max",
+      "platform_config": "src/ui-ux-pro-max/templates/platforms/codex.json",
+      "template_root": "src/ui-ux-pro-max/templates",
+      "data_dir": "src/ui-ux-pro-max/data",
+      "scripts_dir": "src/ui-ux-pro-max/scripts"
+    }
+  ]
+}