Define 8 TypeScript plugin interfaces for extensibility

[frankxai]

Interfaces Needed

1. IPlugin — Plugin lifecycle (init, activate, deactivate, dispose)
2. IAgent — Agent definition (name, description, model, system prompt, tools)
3. IHook — Hook definition (event, handler, priority, conditions)
4. ITool — Tool definition (name, description, schema, execute)
5. ISkill — Skill definition (name, trigger, prompt, tools)
6. ICommand — Command definition (name, aliases, handler)
7. IMcpServer — MCP server definition (name, transport, tools, resources)
8. IGuardian — Guardian definition (gate, element, domain, model, luminors)

Requirements

• Zod v4 runtime validation for all interfaces
• JSON Schema export for external tooling
• Backward compatible with @opencode-ai/plugin interface
• Support for lazy loading and tree-shaking

[frankxai]

Intelligence OS Created

The Arcanea Intelligence OS has been built at packages/opencode/src/arcanea/:

• intelligence.ts — 4-layer hierarchy + multi-AGI routing table
• guardians.ts — 10 Guardian definitions with full canonical data
• domains.ts — 5 creative domains with file patterns and triggers
• router.ts — Task detection with 12+ regex patterns
• agents.ts — 10 creative agent types with rich prompt templates
• prompt-builder.ts — System prompt builder for contextual intelligence
• index.ts — Barrel export

These define the data/logic layer. TypeScript interfaces remain for a future PR.

[frankxai]

Runtime bridge created (runtime.ts): getIntelligenceContext() + routeMessage() + arcanea-intelligence.md agent. 6 runtime tests pass.