fix(plugins): change author from string to object in plugin.json

Claude Code plugin manifest requires author as {"name": "..."}, not a
plain string. Fixes install error: "author: Invalid input: expected
object, received string"

Affected: agenthub, a11y-audit

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

engineering-team/a11y-audit/.claude-plugin/plugin.json

@@ -2,7 +2,10 @@
   "name": "a11y-audit",
   "description": "WCAG 2.2 accessibility audit and fix skill for React, Next.js, Vue, Angular, Svelte, and HTML. Static scanner detecting 20+ violation types, contrast checker with suggest mode, framework-specific fix patterns, CI-friendly exit codes.",
   "version": "2.1.2",
-  "author": "Alireza Rezvani",
+  "author": {
+    "name": "Alireza Rezvani",
+    "url": "https://alirezarezvani.com"
+  },
   "homepage": "https://github.com/alirezarezvani/claude-skills/tree/main/engineering-team/a11y-audit",
   "repository": "https://github.com/alirezarezvani/claude-skills",
   "license": "MIT",

engineering/agenthub/.claude-plugin/plugin.json

@@ -2,7 +2,10 @@
   "name": "agenthub",
   "description": "Multi-agent collaboration plugin for Claude Code. Spawn N parallel subagents that compete on code optimization, content drafts, research approaches, or any problem that benefits from diverse solutions. Evaluate by metric or LLM judge, merge the winner. 7 slash commands, agent templates, git DAG orchestration, message board coordination.",
   "version": "2.1.2",
-  "author": "Alireza Rezvani",
+  "author": {
+    "name": "Alireza Rezvani",
+    "url": "https://alirezarezvani.com"
+  },
   "homepage": "https://github.com/alirezarezvani/claude-skills/tree/main/engineering/agenthub",
   "repository": "https://github.com/alirezarezvani/claude-skills",
   "license": "MIT",