feat(integrations): add OpenClaw plugin and integration module (#460)

- Add integrations/openclaw/ with OpenClawKGTool (REST) and
  OpenClawMCPConfig (mcporter.json generator)
- Add plugins/.openclaw-plugin/ bundle (plugin.json, marketplace.json,
  README) with MCP + native tool support
- Add OpenClaw badge to README header
- Reorganize "Works With Every AI Tool" table into labeled groups:
  Native Plugin Bundle, MCP Server + Plugin, MCP Server, REST API

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

plugins/.openclaw-plugin/plugin.json

@@ -0,0 +1,46 @@
+{
+  "name": "semantica-openclaw",
+  "displayName": "Semantica OpenClaw Plugin",
+  "description": "Semantica plugin for OpenClaw: knowledge graph skills, decision intelligence, reasoning, extraction, and visualization via MCP and native REST tool.",
+  "version": "0.1.0",
+  "author": {
+    "name": "Semantica Contributors"
+  },
+  "homepage": "https://github.com/Hawksight-AI/semantica",
+  "repository": "https://github.com/Hawksight-AI/semantica",
+  "license": "MIT",
+  "keywords": [
+    "semantica",
+    "knowledge graph",
+    "openclaw",
+    "context graphs",
+    "decision intelligence",
+    "explainability",
+    "causal analysis",
+    "provenance",
+    "ontology",
+    "graph analytics",
+    "semantic extraction",
+    "visualization",
+    "reasoning",
+    "mcp"
+  ],
+  "skills": "../skills",
+  "agents": "../agents",
+  "hooks": "../hooks/hooks.json",
+  "mcp": {
+    "server": "python -m semantica.mcp_server",
+    "transport": "stdio"
+  },
+  "openclaw": {
+    "mcporter": {
+      "mcpServers": {
+        "semantica": {
+          "command": "python",
+          "args": ["-m", "semantica.mcp_server"],
+          "transport": "stdio"
+        }
+      }
+    }
+  }
+}