feat: add Intent system for semi-automated attack loop

[Esonhugh]

Summary

• Add Intent queue system with Goal/Intent domain types and MCP tool integration
• Implement TreeView UI for reviewing, approving, and dismissing intents from the sidebar
• Expose set_goal, get_goal, create_intent, list_intents, update_intent_status, execute_intent as MCP tools for AI-driven pentest orchestration
• Clean up command registration: stateless commands in registerCommands, feature-scoped commands in their own modules

Key changes

• Domain: Intent and Goal types (src/core/domain/intent.ts)
• Feature module: src/features/intent/ — queue, treeview, approve/skip commands
• MCP Server: 6 new intent-related tools in httpServer.ts
• registerCommands: refactored with Exposed/Internal separation and clear ownership convention

Test plan

• Unit tests for Intent domain types pass (src/test/unit/core/domain/intent.test.ts)
• Verify TreeView renders pending/approved/completed intents correctly
• Test MCP tools via Claude/Cursor: create_intent → approve → execute_intent flow
• Confirm goal setting via Command Palette and MCP tool

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