Scenario and agent upgrades

[lorenss-m]

Note

Environment / Scenarios

• Introduces MCPRouter (alias ToolRouter) to route tools, prompts, and resources; builds per-type routing and uses connector-cached lists
• Adds ScenarioSession with single active session, revamped submit()/evaluate flow, and local vs remote scenario handling using normalized env:scenario IDs
• Normalizes Environment names (lowercase, hyphens); validates scenario names (no :); parallel fetch of tools/prompts/resources on enter; router-driven list_*, get_prompt, and read_resource

Claude Agent

• Supports EmbeddedResource PDFs in tool results via document_to_content_block; improves tool mapping and typings

CLI

• hud dev resolves server attr fallbacks (mcp→env/environment/server) and updates guidance

Docs

• Adds Platform docs for platform/slack and platform/subagent; updates migration guide to prompt-passthrough pattern; updates navigation

Version

• Bumps SDK to 0.5.7 (code, tests, docs)

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