feat(registry): seed 26 verified 2026 AI-agent failure cases (#59)

Adds batch 4 of source-cited incidents spanning January to August 2026,
covering agent sandbox escapes, MCP and coding-agent CVEs, AI supply
chain compromises, and AI litigation and regulatory actions.

Case numbers are derived from the highest number on file plus one,
matching lib/db/case-number.ts, with retry on unique violations.

Adds workday, semantic-kernel and mcp to the agents constant.

Author: royalpinto007

lib/constants/agents.ts

@@ -236,6 +236,27 @@ export const AGENTS: AgentMeta[] = [
     description:
       "Amazon's agentic AI coding assistant, used internally and by AWS customers for autonomous development tasks.",
   },
+  {
+    slug: "workday",
+    name: "Workday AI Screening",
+    company: "Workday",
+    description:
+      "Workday's AI-powered recruiting and applicant screening tools, used by employers to filter job applications at scale.",
+  },
+  {
+    slug: "semantic-kernel",
+    name: "Microsoft Semantic Kernel",
+    company: "Microsoft",
+    description:
+      "Microsoft's open-source agent framework for orchestrating LLM tool use across .NET, Python and Java.",
+  },
+  {
+    slug: "mcp",
+    name: "Model Context Protocol (MCP)",
+    company: "Anthropic",
+    description:
+      "Open protocol and SDKs connecting AI agents to external tools, data sources and servers.",
+  },
   {
     slug: "grok",
     name: "Grok",