Add generic run-control adapters

[chubes4]

Summary

• promote generic run-control status, cancel, and event normalization into the runtime layer
• add a filter-backed run-control adapter contract for get/list-events/cancel handlers
• keep existing chat run-control abilities and filters intact while delegating normalization through the generic adapter
• add smoke coverage for status, cancel, and event normalization

Testing

• php tests/run-control-normalization-smoke.php
• php tests/chat-run-control-smoke.php
• composer phpstan
• composer smoke

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (gpt-5.5)
• Used for: Drafted the runtime adapter implementation, chat delegation changes, and smoke coverage; Chris remains responsible for review and testing.