feat(commons): CachedCallTelemetry combined operational+audit packet (#23 M3)

src/ScadaLink.Commons/Messages/Integration/CachedCallTelemetry.cs

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+using ScadaLink.Commons.Entities.Audit;
+using ScadaLink.Commons.Types;
+
+namespace ScadaLink.Commons.Messages.Integration;
+
+/// <summary>
+/// Combined audit + operational telemetry packet for cached outbound calls
+/// (Audit Log #23 / M3). The site emits one packet per lifecycle event
+/// — <c>Submit</c> (Audit kind <c>CachedSubmit</c>), per-attempt
+/// <c>ApiCallCached</c>/<c>DbWriteCached</c>, terminal <c>CachedResolve</c> —
+/// and central writes the <see cref="AuditEvent"/> row plus the
+/// <see cref="SiteCallOperational"/> upsert in one MS SQL transaction. Two
+/// payload shapes ride on a single wire message so the same on-the-wire batch
+/// can carry mixed lifecycle events without the central dual-write needing a
+/// second RPC for the operational state.
+/// </summary>
+/// <remarks>
+/// <para>
+/// Both inner records carry the same <c>TrackedOperationId</c> — the
+/// idempotency key end-to-end. The <see cref="AuditEvent.CorrelationId"/>
+/// pattern (used by Audit Log #23 to thread cached-call rows together) is
+/// honoured by the site emitter; the packet itself is shape-only and makes no
+/// independent correlation guarantees.
+/// </para>
+/// <para>
+/// Additive-only per Commons REQ-COM-5a (M2 reviewer note) — this is a new
+/// message, not a rename of any existing M2 envelope.
+/// </para>
+/// </remarks>
+/// <param name="Audit">The Audit Log #23 row to insert at central.</param>
+/// <param name="Operational">The <c>SiteCalls</c> upsert mirroring this lifecycle event.</param>
+public sealed record CachedCallTelemetry(
+    AuditEvent Audit,
+    SiteCallOperational Operational);

src/ScadaLink.Commons/Types/SiteCallOperational.cs

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+namespace ScadaLink.Commons.Types;
+
+/// <summary>
+/// Operational state of one cached call as seen by the site, carried on the
+/// combined <c>CachedCallTelemetry</c> packet (Audit Log #23 / M3) and persisted
+/// at central as the <c>SiteCalls</c> row mirroring the call's status.
+/// </summary>
+/// <remarks>
+/// <para>
+/// One row per <see cref="TrackedOperationId"/> at central; ingest is
+/// insert-if-not-exists then upsert-on-newer-status (monotonic — never rolls
+/// back). The site remains the source of truth — this record is the
+/// "eventually-consistent mirror" the central UI's Site Calls page reads.
+/// </para>
+/// </remarks>
+/// <param name="TrackedOperationId">Idempotency key shared with the audit row.</param>
+/// <param name="Channel">
+/// Trust-boundary channel — <c>"ApiOutbound"</c> or <c>"DbOutbound"</c>. String form
+/// (not the <see cref="ScadaLink.Commons.Types.Enums.AuditChannel"/> enum) so the
+/// record serialises identically across SQL / gRPC / JSON boundaries.
+/// </param>
+/// <param name="Target">Human-readable target (e.g. <c>"ERP.GetOrder"</c>).</param>
+/// <param name="SourceSite">Site id that submitted the cached call.</param>
+/// <param name="Status">
+/// Lifecycle status — string form of <see cref="ScadaLink.Commons.Types.Enums.AuditStatus"/>:
+/// <c>Submitted</c>, <c>Retrying</c>, <c>Attempted</c>, <c>Delivered</c>,
+/// <c>Failed</c>, <c>Parked</c>, <c>Discarded</c>.
+/// </param>
+/// <param name="RetryCount">Number of dispatch attempts so far; 0 prior to first attempt.</param>
+/// <param name="LastError">Most recent error message; null when no failures have occurred.</param>
+/// <param name="HttpStatus">Most recent HTTP status code (API calls only); null otherwise.</param>
+/// <param name="CreatedAtUtc">UTC timestamp the cached call was first submitted.</param>
+/// <param name="UpdatedAtUtc">UTC timestamp of the latest status mutation.</param>
+/// <param name="TerminalAtUtc">UTC timestamp the row reached a terminal status; null while still active.</param>
+public sealed record SiteCallOperational(
+    TrackedOperationId TrackedOperationId,
+    string Channel,
+    string Target,
+    string SourceSite,
+    string Status,
+    int RetryCount,
+    string? LastError,
+    int? HttpStatus,
+    DateTime CreatedAtUtc,
+    DateTime UpdatedAtUtc,
+    DateTime? TerminalAtUtc);