Foundation for the v1.1.x stateful SDK services. Lands the shape only:
- SdkCallCx — per-call context plumbed into every future service
trait method (app_id, principal, execution/request ids, trigger
depth slots).
- Services — empty non_exhaustive bundle; v1.1.1 (KV) adds the first
field, subsequent PRs follow.
- ServiceEventEmitter — async trait future services emit through;
real outbox-backed impl lands with triggers in v1.1.1. NoopEventEmitter
is the v1.1.0 default.
No behaviour change. Subsequent commits in this PR plumb these types
through executor-core and the orchestrator dispatch path.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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