Align plugin manifests and marketplaces with current docs

plugins/.claude-plugin/plugin.json

@@ -2,10 +2,21 @@
   "name": "semantica",
   "description": "Full-stack knowledge graph skills: semantic extraction, decision intelligence, context graphs, reasoning, explainability, ontology, provenance, deduplication, visualization, and multi-format export.",
   "version": "0.1.0",
-  "author": {"name": "Semantica Contributors"},
+  "author": {
+    "name": "Semantica Contributors"
+  },
   "homepage": "https://github.com/Hawksight-AI/semantica",
   "repository": "https://github.com/Hawksight-AI/semantica",
-  "platforms": ["claude", "cursor", "codex"],
-  "keywords": ["semantica", "knowledge graph", "visualization", "reasoning", "extraction", "mcp"],
-  "license": "MIT"
-}
+  "license": "MIT",
+  "keywords": [
+    "semantica",
+    "knowledge graph",
+    "visualization",
+    "reasoning",
+    "extraction",
+    "mcp"
+  ],
+  "skills": "./skills",
+  "agents": "./agents",
+  "hooks": "./hooks/hooks.json"
+}