Both subagent revivers rebuilt the session but never wired the extension
runtime, leaving it pre-init where every action method throws
ExtensionRuntimeNotInitializedError. An extension with a tool_call handler
touching a runtime action then tripped the fail-closed gate in emitToolCall
and blocked every tool, including the hidden yield, so the revived agent
could neither finish nor exit and looped until killed.
Both the warm lifecycle reviver (executor.ts) and the cold persisted
reviver (persisted-revive.ts) now call the shared initializeExtensions
helper on the rebuilt session, restoring runtime actions, onError, and the
session_start event.
Fixes#8824
roboomp
3acc57de8c