feat: add HTTP tf-sdk mock seam and terminate-service command handler

Wires an optional TransformationFunctionExecutionPort behind SRM's
deploy/terminate pipelines (disabled by default) that forwards
activate/deactivate_capability calls to an HTTP tf-sdk stand-in, and
adds the terminate-service coordinator that was previously a no-op,
so DELETE flows no longer hang waiting for a completion event.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>