Add canonical run lifecycle controls

[chubes4]

Summary

• Record canonical run lifecycle events in the shared WP_Agent_Run_Control store.
• Add workflow and runtime package get/cancel/list-events abilities backed by the shared run-control contract, with handler filters for host overrides.
• Check conversation-loop cancellation before and after provider turns and mediated tool execution.
• Add a focused canonical run lifecycle smoke test.

Tests

• composer run smoke
• composer run phpstan

AI assistance

• AI assistance: Yes
• Tool(s): OpenCode (gpt-5.5)
• Used for: Implementation, focused smoke coverage, and local verification; Chris remains responsible for review and final validation.