fix: use valid plugin.json schema — path strings only

Replaced invalid nested "frames" and "commands" objects with
standard path-based fields: commands → ./commands/, skills → ./skills/.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: auge2u

.claude-plugin/plugin.json

@@ -2,21 +2,6 @@
   "name": "webplatform4sync",
   "version": "0.5.0",
   "description": "Platform4Sync skill surface with command frames — same tools, different approaches",
-  "frames": {
-    "construction": {
-      "manifest": "frames/construction/frame.json",
-      "activationCommands": ["site", "pour", "frame", "wire", "finish"],
-      "description": "Physical build sequence: site → pour → frame → wire → finish"
-    },
-    "shuhari": {
-      "manifest": "frames/shuhari/frame.json",
-      "activationCommands": ["shu", "ha", "ri"],
-      "description": "Mastery progression per concern: shu → ha → ri"
-    }
-  },
-  "commands": {
-    "framed": ["site", "pour", "frame", "wire", "finish", "shu", "ha", "ri"],
-    "standalone": ["diagnose-tokens"],
-    "legacy": ["wp4s1_discover", "wp4s2_scaffold", "wp4s3_tenant", "wp4s4_database", "wp4s5_auth", "wp4s6_tokens", "wp4s7_deploy", "wp4s8_validate", "wp4s9_status"]
-  }
+  "commands": "./commands/",
+  "skills": "./skills/"
 }