♻️ refactor(skills): rename repo skills source dir

move the repository skills source from `codex/skills` to `skills`.

update vendor/install_skills paths, thirdparty sync pipeline, docs, and regression tests, including deployment-route e2e coverage.

.gitea/ci/thirdparty_skills.json

@@ -6,7 +6,7 @@
       "upstream_ref": "main",
       "snapshot_dir": "superpowers",
       "sync_mode": "copy_skill_dirs",
-      "source_list": "codex/skills/thirdparty/.sources/superpowers.list",
+      "source_list": "skills/thirdparty/.sources/superpowers.list",
       "skills_subdir": "skills",
       "remove_paths": ["skills/ui-ux-pro-max"]
     },
@@ -15,8 +15,8 @@
       "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/thirdparty/.sources/ui-ux-pro-max.list",
+      "sync_mode": "render_skill",
+      "source_list": "skills/thirdparty/.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",
@@ -29,7 +29,7 @@
       "upstream_ref": "main",
       "snapshot_dir": "andrej-karpathy-skills",
       "sync_mode": "copy_skill_dirs",
-      "source_list": "codex/skills/thirdparty/.sources/andrej-karpathy-skills.list",
+      "source_list": "skills/thirdparty/.sources/andrej-karpathy-skills.list",
       "skills_subdir": "skills"
     }
   ]