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

@@ -42,8 +42,8 @@
       "repo": "https://github.com/vercel-labs/skills.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "14cf84aa922cccc7e5b11fee5af9a01b3750fddf",
-      "syncedAt": "2026-10-06T07:26:41Z"
+      "commit": "48dc9e8eb8aa19040e91cb90ba0b642c9cbad57e",
+      "syncedAt": "2026-10-07T16:00:00Z"
     },
     {
       "id": "generate-agents-md",
@@ -123,8 +123,8 @@
       "repo": "https://github.com/Leonxlnx/taste-skill.git",
       "ref": "main",
       "adapter": "skill-collection",
-      "commit": "ce26fc25c0e5e8cab638f883de62d9a86ee5e45b",
-      "syncedAt": "2026-09-26T16:00:00Z"
+      "commit": "b482f7a970abb98c4108d4a9f761e458c64cefc8",
+      "syncedAt": "2026-10-07T16:00:00Z"
     },
     {
       "id": "shadcn",
@@ -132,8 +132,8 @@
       "repo": "https://github.com/shadcn-ui/ui.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "debae9baea4d5c6bd0b1a857b09664db4b925818",
-      "syncedAt": "2026-10-06T16:00:00Z"
+      "commit": "97ddbf4274ed09d02aa7fd34375f2cf1e48cbbf0",
+      "syncedAt": "2026-10-07T16:00:00Z"
     },
     {
       "id": "frontend-slides",
@@ -168,8 +168,8 @@
       "repo": "https://github.com/hugohe3/ppt-master.git",
       "ref": "main",
       "adapter": "claude-skill",
-      "commit": "2d72da616cf9fa40d4dcaf59fd4c980ecf534b7d",
-      "syncedAt": "2026-10-05T16:00:00Z"
+      "commit": "440557b8dc7c7257b69c04a0b014d5c50a78e6cb",
+      "syncedAt": "2026-10-07T16:00:00Z"
     },
     {
       "id": "grill-me",
@@ -177,8 +177,8 @@
       "repo": "https://github.com/mattpocock/skills.git",
       "ref": "main",
       "adapter": "skill-collection",
-      "commit": "6fd947921b935b7e1e69293a200400f0fdd5c15f",
-      "syncedAt": "2026-10-06T16:00:00Z"
+      "commit": "f3fc5632f401156837ee3872f14fe33ccf1024ea",
+      "syncedAt": "2026-10-07T16:00:00Z"
     },
     {
       "id": "updating-gitea-repositories",
@@ -258,8 +258,8 @@
       "repo": "https://github.com/vercel/next.js.git",
       "ref": "canary",
       "adapter": "skill-collection",
-      "commit": "b22e5a299cb58577ce86f21b6a0f7bb31a6168f2",
-      "syncedAt": "2026-10-06T16:00:00Z"
+      "commit": "aaf0a16f530f097548a9256133f5bad0e9098794",
+      "syncedAt": "2026-10-07T16:00:00Z"
     },
     {
       "id": "shuorenhua",