Publish lean skill market snapshot

Constraint: This repository is a skill distribution snapshot, so download size matters more than historical auditability.
Rejected: Preserve prior Git history | Old large blobs keep clone size high and do not help skill consumers.
Confidence: high
Scope-risk: broad
Directive: Future market updates should be validated, then collapsed to a fresh snapshot commit before push.
Tested: python scripts/validate_marketplace.py; validate_plugin.py plugins/codex/plugins/ppt-master; uv run python -m pytest backend/tests/test_skill_market_publish.py backend/tests/test_skill_market_scheduler.py -q; node web/tests/skills-market-ui.test.mjs; git diff --check; Codex temp install/use test for ppt-master
Not-tested: PowerShell execution because pwsh/powershell is not installed locally.

config/external-sources.lock.json

@@ -0,0 +1,67 @@
+{
+  "sources": [
+    {
+      "id": "superpowers",
+      "pluginName": "superpowers",
+      "repo": "https://github.com/obra/superpowers.git",
+      "ref": "main",
+      "adapter": "codex-plugin",
+      "commit": "6fd4507659784c351abbd2bc264c7162cfd386dc",
+      "syncedAt": "2026-06-10T07:28:13Z"
+    },
+    {
+      "id": "ui-ux-pro-max",
+      "pluginName": "ui-ux-pro-max",
+      "repo": "https://github.com/nextlevelbuilder/ui-ux-pro-max-skill.git",
+      "ref": "main",
+      "adapter": "claude-skill",
+      "commit": "b7e3af80f6e331f6fb456667b82b12cade7c9d35",
+      "syncedAt": "2026-06-10T07:28:13Z"
+    },
+    {
+      "id": "shadcn",
+      "pluginName": "shadcn",
+      "repo": "https://github.com/shadcn-ui/ui.git",
+      "ref": "main",
+      "adapter": "claude-skill",
+      "commit": "1994caba0b2140d4d5aa765bb9d7d4412d6aaabb",
+      "syncedAt": "2026-06-11T02:45:51Z"
+    },
+    {
+      "id": "frontend-slides",
+      "pluginName": "frontend-slides",
+      "repo": "https://github.com/zarazhangrui/frontend-slides.git",
+      "ref": "main",
+      "adapter": "claude-skill",
+      "commit": "871ce4daa13599d6195fe0bb465eb0ed80b2fa44",
+      "syncedAt": "2026-06-11T03:57:53Z"
+    },
+    {
+      "id": "guizang-ppt-skill",
+      "pluginName": "guizang-ppt-skill",
+      "repo": "https://github.com/op7418/guizang-ppt-skill.git",
+      "ref": "main",
+      "adapter": "claude-skill",
+      "commit": "82fe5ae129e8c2a12e1155fcabed6703342749d6",
+      "syncedAt": "2026-06-11T03:57:53Z"
+    },
+    {
+      "id": "html-ppt",
+      "pluginName": "html-ppt",
+      "repo": "https://github.com/lewislulu/html-ppt-skill.git",
+      "ref": "main",
+      "adapter": "claude-skill",
+      "commit": "f3a8435d3901697d5ac5e64d356c933637e43107",
+      "syncedAt": "2026-06-11T03:57:53Z"
+    },
+    {
+      "id": "ppt-master",
+      "pluginName": "ppt-master",
+      "repo": "https://github.com/hugohe3/ppt-master.git",
+      "ref": "main",
+      "adapter": "claude-skill",
+      "commit": "2b337bec18c2cb1381fee2dfca2e6f6fed463ce6",
+      "syncedAt": "2026-06-11T03:57:53Z"
+    }
+  ]
+}