Sync third-party and MCP marketplace plugins

Constraint: Public skills are published only by explicit administrator action unless they are tracked third-party market sources.
Confidence: high
Scope-risk: narrow
Directive: Keep private/internal skills out of the public marketplace and preserve normal incremental market Git history.
Tested: Marketplace validation passed.

config/external-sources.lock.json

@@ -6,8 +6,8 @@
       "repo": "https://github.com/Nutlope/hallmark.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "8f6969f8922caabde9de1784959eae11ddf68073",
-      "syncedAt": "2026-10-29T15:25:46Z"
+      "commit": "4f6a46c6dc325d40ab268c93e25c7b96676ebccd",
+      "syncedAt": "2026-10-30T16:00:00Z"
     },
     {
       "id": "docx",
@@ -150,8 +150,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "96da9cc7f1aa10580a3741664e2a77c721206c00",
-      "syncedAt": "2026-10-28T01:57:49Z"
+      "commit": "b8d7baa15b1dca5716f13153e63795fc3d741f6b",
+      "syncedAt": "2026-10-30T16:00:00Z"
     },
     {
       "id": "frontend-slides",
@@ -168,8 +168,8 @@
       "repo": "https://github.com/op7418/guizang-ppt-skill.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "c91369c449d34755d320a8b81d0734000d99d1ab",
-      "syncedAt": "2026-08-08T16:00:01Z"
+      "commit": "93d21bf4a73a851907a6eb00acbf30618236667a",
+      "syncedAt": "2026-10-30T16:00:00Z"
     },
     {
       "id": "html-ppt",
@@ -186,8 +186,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "15baa7c570f12c78cd9ac6ead897724571e32e87",
-      "syncedAt": "2026-10-29T16:00:00Z"
+      "commit": "5e8856be0da8e6bc85c4aa28acc614478f7b7137",
+      "syncedAt": "2026-10-30T16:00:00Z"
     },
     {
       "id": "grill-me",
@@ -267,8 +267,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "79107ebd94e53c69865c1a49ac734ba8004491ba",
-      "syncedAt": "2026-10-29T16:00:00Z"
+      "commit": "7571895249a22086367a12ddec90fae97bac067d",
+      "syncedAt": "2026-10-30T16:00:00Z"
     },
     {
       "id": "shuorenhua",