docs: update plugin entry references to V1 PluginModule shape

Sync the stale plugin entry docs with the shipped V1 PluginModule default export and remove the removed callable symbol references.\n\nUltraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)\nCo-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

AGENTS.md

@@ -11,7 +11,7 @@ OpenCode plugin (npm: `oh-my-opencode`) extending Claude Code with multi-agent o
 ```
 oh-my-opencode/
 ├── src/
-│   ├── index.ts              # Plugin entry: loadConfig → createManagers → createTools → createHooks → createPluginInterface
+│   ├── index.ts              # Plugin entry: default export `pluginModule`, shape `{ id, server }`
 │   ├── plugin-config.ts      # JSONC multi-level config: user → project → defaults (Zod v4)
 │   ├── agents/               # 11 agents (Sisyphus, Hephaestus, Oracle, Librarian, Explore, Atlas, Prometheus, Metis, Momus, Multimodal-Looker, Sisyphus-Junior)
 │   ├── hooks/                # 52 lifecycle hooks across dedicated modules and standalone files
@@ -33,7 +33,7 @@ oh-my-opencode/
 ## INITIALIZATION FLOW
 
 ```
-OhMyOpenCodePlugin(ctx)
+pluginModule.server(input, options)
   ├─→ loadPluginConfig()         # JSONC parse → project/user merge → Zod validate → migrate
   ├─→ createManagers()           # TmuxSessionManager, BackgroundManager, SkillMcpManager, ConfigHandler
   ├─→ createTools()              # SkillContext + AvailableCategories + ToolRegistry (26 tools)