docs(requirements): add Tracking.Status and cached-call handles to Script Runtime API

docs/requirements/Component-SiteRuntime.md

@@ -254,15 +254,19 @@ Available to all Script Execution Actors and Alarm Execution Actors:
 
 ### External Systems
 - `ExternalSystem.Call("systemName", "methodName", params)` — Synchronous HTTP call. Blocks until response or timeout. All failures return to script. Use when the script needs the result.
-- `ExternalSystem.CachedCall("systemName", "methodName", params)` — Fire-and-forget with store-and-forward on transient failure. Use for outbound data pushes where deferred delivery is acceptable.
+- `ExternalSystem.CachedCall("systemName", "methodName", params)` — Deferred delivery. Returns a `TrackedOperationId` tracking handle immediately rather than the response; the call is attempted immediately and, on transient failure, store-and-forwarded for retry. Use for outbound data pushes where deferred delivery is acceptable.
+- The returned `TrackedOperationId` can be passed to `Tracking.Status(id)` (see **Operation Tracking** below) to observe delivery progress.
 
 ### Notifications
-- `Notify.To("listName").Send("subject", "message")` — Send a notification via a named notification list. Generates a `NotificationId` (GUID) locally and returns it immediately; the notification is store-and-forwarded to the central cluster, which owns delivery. The script never contacts SMTP.
+- `Notify.To("listName").Send("subject", "message")` — Send a notification via a named notification list. Generates a `TrackedOperationId` (GUID) locally and returns it immediately; the notification is store-and-forwarded to the central cluster, which owns delivery. The script never contacts SMTP. (`NotificationId` is the notification-domain name for this same `TrackedOperationId` type.)
-- `Notify.Status("notificationId")` — Returns a status record (status, retry count, last error, key timestamps). While the notification is still in the site store-and-forward buffer the site answers locally (status `Forwarding`); once forwarded the query round-trips to central.
+- `Notify.Status("trackedOperationId")` — A thin alias of `Tracking.Status(id)` retained for the notification domain. Returns a status record (status, retry count, last error, key timestamps). While the notification is still in the site store-and-forward buffer the site answers locally (status `Forwarding`); once forwarded the query round-trips to central.
 
 ### Database Access
 - `Database.Connection("connectionName")` — Obtain a raw MS SQL client connection (ADO.NET) for synchronous read/write.
-- `Database.CachedWrite("connectionName", "sql", parameters)` — Submit a write operation for store-and-forward delivery.
+- `Database.CachedWrite("connectionName", "sql", parameters)` — Submit a write operation for store-and-forward delivery. Returns a `TrackedOperationId` tracking handle immediately; pass it to `Tracking.Status(id)` to observe delivery progress.
+
+### Operation Tracking
+- `Tracking.Status("trackedOperationId")` — Returns a status record (status, retry count, last error, key timestamps) for any tracked operation: a cached external system call, a cached database write, or a notification. For cached calls and writes the answer is always site-local and authoritative — the site owns the operation tracking table. (`Notify.Status(...)` is a thin alias scoped to the notification domain.)
 
 ### Parameter Access
 - `Parameters["key"]` — Raw dictionary access (returns `object?`, requires manual casting).
@@ -283,7 +287,7 @@ Available to all Script Execution Actors and Alarm Execution Actors:
 
 Scripts execute **in-process** with constrained access. The following restrictions are enforced at compilation and runtime:
 
-- **Allowed**: Access to the Script Runtime API (GetAttribute, SetAttribute, CallScript, CallShared, ExternalSystem, Notify, Database), standard C# language features, basic .NET types (collections, string manipulation, math, date/time).
+- **Allowed**: Access to the Script Runtime API (GetAttribute, SetAttribute, CallScript, CallShared, ExternalSystem, Notify, Database, Tracking), standard C# language features, basic .NET types (collections, string manipulation, math, date/time).
 - **Forbidden**: File system access (`System.IO`), process spawning (`System.Diagnostics.Process`), threading (`System.Threading` — except async/await), reflection (`System.Reflection`), raw network access (`System.Net.Sockets`, `System.Net.Http` — must use `ExternalSystem.Call`), assembly loading, unsafe code.
 - **Execution timeout**: Configurable per-script maximum execution time. Exceeding the timeout cancels the script and logs an error.
 - **Memory**: Scripts share the host process memory. No per-script memory limit, but the execution timeout prevents runaway allocations.
@@ -354,7 +358,7 @@ Per Akka.NET best practices, internal actor communication uses **Tell** (fire-an
 ## Dependencies
 
 - **Data Connection Layer**: Provides tag value updates to Instance Actors. Receives write requests from Instance Actors.
-- **Store-and-Forward Engine**: Handles reliable delivery for external system calls, cached database writes, and notifications submitted by scripts. For the notification category specifically, it forwards to the central cluster for delivery (not directly to SMTP).
+- **Store-and-Forward Engine**: Handles reliable delivery for external system calls, cached database writes, and notifications submitted by scripts. For the notification category specifically, it forwards to the central cluster for delivery (not directly to SMTP). Owns the site-local operation tracking table that backs `Tracking.Status(id)`.
 - **External System Gateway**: Provides external system method invocations for scripts.
 - **Communication Layer**: Receives deployments and lifecycle commands from central. Handles debug view requests. Reports deployment results.
 - **Site Event Logging**: Records script executions, alarm events, deployment events, instance lifecycle events.