refactor(commons): FlowTraceCollector.Add(lowPriority:) instead of a fourth public method (Commons method-count constraint)

src/ZB.MOM.WW.ScadaBridge.Commons/Types/Debugging/FlowTraceCollector.cs

@@ -28,10 +28,10 @@ namespace ZB.MOM.WW.ScadaBridge.Commons.Types.Debugging;
 /// non-ASCII ones. That worst case still fits the 4 MB limit with the rest of the reply, which is
 /// what the budget exists to guarantee — raise it only with a real serialized-size measurement.
 /// Step-logs addendum (D7, 2026-09-09): a <c>ScriptLog</c> row per script log line rides the same
-/// sink via <see cref="AddLowPriority"/>, a lower-priority lane that shares the same
-/// <see cref="_events"/>/<see cref="_bytes"/> accounting but stops <see cref="LowPriorityReserveEvents"/>
-/// events short of the count cap and at <see cref="LowPriorityByteShare"/> of the byte budget — so
-/// the step rows a run emits at the very end (the <c>ScriptRun</c> anchor is written last) always
+/// sink via <see cref="Add"/>'s <c>lowPriority</c> parameter — a lower-priority lane that shares
+/// the same event list/byte accounting but stops <see cref="LowPriorityReserveEvents"/> events
+/// short of the count cap and at <see cref="LowPriorityByteShare"/> of the byte budget — so the
+/// step rows a run emits at the very end (the <c>ScriptRun</c> anchor is written last) always
 /// have room, even on a chatty run whose log lines alone would otherwise fill the collector. A
 /// dropped low-priority row sets <see cref="LogsTruncated"/> instead of <see cref="Truncated"/>,
 /// because losing inline log lines does not affect step-row fidelity the way losing a step row
@@ -43,14 +43,14 @@ public sealed class FlowTraceCollector
     public const int DefaultMaxEvents = 500;
 
     /// <summary>
-    /// Events reserved for <see cref="Add"/> (step rows) — <see cref="AddLowPriority"/> (log
-    /// lines) stops this many events short of the event cap (D7, 2026-09-09).
+    /// Events reserved for full-priority step rows — a low-priority (log line) <see cref="Add"/>
+    /// stops this many events short of the event cap (D7, 2026-09-09).
     /// </summary>
     public const int LowPriorityReserveEvents = 50;
 
     /// <summary>
-    /// Share of the byte budget <see cref="AddLowPriority"/> (log lines) may consume — the
-    /// remainder is reserved for <see cref="Add"/> (step rows) (D7, 2026-09-09).
+    /// Share of the byte budget a low-priority (log line) <see cref="Add"/> may consume — the
+    /// remainder is reserved for full-priority step rows (D7, 2026-09-09).
     /// </summary>
     public const double LowPriorityByteShare = 0.75;
 
@@ -75,7 +75,7 @@ public sealed class FlowTraceCollector
     public bool Truncated { get; private set; }
 
     /// <summary>
-    /// True once an <see cref="AddLowPriority"/> (log line) was dropped because the low-priority
+    /// True once a low-priority (log line) <see cref="Add"/> was dropped because the low-priority
     /// event or byte share was reached — reported separately from <see cref="Truncated"/> because
     /// step-row fidelity is unaffected (D7, 2026-09-09).
     /// </summary>
@@ -105,22 +105,16 @@ public sealed class FlowTraceCollector
     }
 
     /// <summary>
-    /// Appends the REDACTED copy of a step event, or marks the collector truncated once the
-    /// event cap or the byte budget is reached. A no-op after <see cref="Complete"/>. Full
-    /// priority — never yields to a log line queued via <see cref="AddLowPriority"/>.
+    /// Appends the REDACTED copy of an event, or marks the collector truncated once the event
+    /// cap or the byte budget is reached. A no-op after <see cref="Complete"/>.
     /// </summary>
-    public void Add(AuditEvent evt) => AddCore(evt, lowPriority: false);
-
-    /// <summary>
-    /// Appends the REDACTED copy of a <c>ScriptLog</c> event at LOW priority (D7, 2026-09-09):
-    /// it stops <see cref="LowPriorityReserveEvents"/> events short of the event cap and at
-    /// <see cref="LowPriorityByteShare"/> of the byte budget, so log lines never crowd out the
-    /// step rows a run emits at the end. A dropped row sets <see cref="LogsTruncated"/>, not
-    /// <see cref="Truncated"/>. A no-op after <see cref="Complete"/>.
-    /// </summary>
-    public void AddLowPriority(AuditEvent evt) => AddCore(evt, lowPriority: true);
-
-    private void AddCore(AuditEvent evt, bool lowPriority)
+    /// <param name="evt">The event to append.</param>
+    /// <param name="lowPriority">
+    /// True for a log-line row — stops at the reserve/byte share and sets
+    /// <see cref="LogsTruncated"/> instead of <see cref="Truncated"/>, so the step rows emitted
+    /// at run end are never crowded out (D7). False (default) for a full-priority step row.
+    /// </param>
+    public void Add(AuditEvent evt, bool lowPriority = false)
     {
         ArgumentNullException.ThrowIfNull(evt);
         // Redaction runs OUTSIDE the lock (arch-review F1): IAuditRedactor is a pure function