Add architecture package and application skeleton

docs/architecture/06_internal_interfaces.md

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+# Internal Interfaces
+
+## Orchestrator Application Ports
+
+### TaskRepository
+
+- create task
+- update task
+- get task by id
+- list active tasks
+
+### GraphRepository
+
+- save graph
+- get graph
+- update node state
+- list ready nodes
+
+### ConfirmationRepository
+
+- create confirmation
+- get confirmation
+- resolve confirmation
+
+### WorkerRepository
+
+- register session
+- update heartbeat
+- assign command
+- complete command
+
+### EventStore
+
+- append event
+- list events by task
+
+### PolicyEvaluator
+
+- evaluate action descriptor against project policy
+
+### ModelRouter
+
+- execute model request and return structured invocation result
+
+### ToolGateway
+
+- call MCP tool and return normalized result
+
+### WorkerGateway
+
+- dispatch command to worker and receive normalized result
+
+## Design Rule
+
+Application services зависят только от этих портов.
+Ни один use case не должен напрямую импортировать HTTP handlers, DB session objects или конкретный MCP/WebSocket client.
+