feat: massive Ruflo-inspired upgrade — plugin system, multi-agent swarm, hooks, enhanced memory
New systems (src/plugins/):
- Plugin.js: lifecycle hooks (onLoad, onUnload, onConfigChange) + BasePlugin
- PluginManager.js: fault-isolated extension point dispatch with metrics
- PluginLoader.js: dependency-resolving batch loader with health checks
- ExtensionPoints.js: 16 standard extension point names
New systems (src/bot/):
- hooks.js: HookManager with pre/post tool, pre/post AI, session lifecycle
- memory-backend.js: JSONBackend (typed entries + LRU) + InMemoryBackend (ephemeral with TTL)
New systems (src/agents/):
- Agent.js: typed agents with capabilities, status tracking
- Task.js: DAG-compatible tasks with priorities, dependencies, rollback
- SwarmCoordinator.js: multi-agent orchestration (simple/hierarchical/swarm topologies)
- agents/index.js: 9 agent roles + AgentOrchestrator
Bot integration (src/bot/index.js):
- 6 new Ruflo-inspired tools: swarm_spawn, swarm_execute, swarm_distribute, swarm_state, swarm_terminate
- Plugin system, hook system, swarm initialized in initBot
- Pre/post tool hooks wired into tool execution
- Ephemeral + persistent memory backends
- Agent orchestrator with 9 specialized agent types
- Graceful shutdown: all systems cleanup, conversation flush, pidfile release
- Return object exposes pluginManager, swarm, hookManager, memBackend, agentOrchestrator, getState
This brings Ruflo's multi-agent architecture, plugin extensibility, hook-based lifecycle, and typed memory to zCode.
