Adds the four internal-only fields every v1.1.x stateful service needs
to isolate by app and audit by caller:
- app_id — owning app for this invocation
- principal — Option<Principal>; data-plane is unauthenticated
today so the orchestrator passes None until the
opportunistic middleware lands in the next commit
- trigger_depth — 0 for direct invocations; the triggers framework
(v1.1.1) bounds runaway feedback loops via this
- root_execution_id — equal to execution_id for direct invocations;
preserved across trigger fan-out for audit grouping
ExecRequest stays serializable (cluster mode still has to ship it across
processes when v1.3+ arrives). principal is `#[serde(skip)]` because
shared::Principal has no wire derivation today — when cluster mode lands
the wire-Principal question gets revisited properly.
Engine now carries a Services bundle (empty in v1.1.0). Engine::execute
constructs an SdkCallCx from the request and hands it to sdk::register_all
just after the per-call Rhai engine is built. The hook is a no-op in v1.1.0;
v1.1.1 KV registers its first native fns there.
Adds ExecError::Overloaded { retry_after_secs } and the matching 503 +
Retry-After mapping in orchestrator-core's IntoResponse. The gate that
actually produces this variant lands in the next commit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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