Consolidate all commands under /core: prefix — review and verify plugins
merged into core. Adds agent_send, agent_inbox, agent_conversation as
Laravel MCP tools so messaging works through the HTTP server.
- 15 commands all under /core: (was split across 3 plugins)
- Messaging tools registered in Boot::onMcpTools()
- Hooks merged (PostToolUse for PR create, PreToolUse for git push)
- Plugin bumped to v0.6.0
Co-Authored-By: Virgil <virgil@lethean.io>
