fix: the warn-once latches reset on a CONFIG, so a reconnect is diagnosed too

Four latches were process-lifetime -- two of them function-local statics, so
process-wide rather than per-object -- and a condition that warned once stayed
silent about every later occurrence in a long-lived session. A diagnostic that
goes quiet after the first occurrence is the failure mode worth fixing in a
feature whose job is diagnosis.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/acquisition.cpp

@@ -122,6 +122,13 @@ void Acquisition::on_config(const udps_signal_t* signals, std::uint32_t count,
                  sig.time_signal_idx, sig.unit.c_str());
   }
   std::fflush(stderr);
+  // The warn-once latches are per *connection*, not per process. A reconnect re-enters here, and
+  // a diagnostic that goes quiet after the first occurrence of a condition that recurs on the
+  // next session is the failure mode worth avoiding in a feature whose whole job is diagnosis.
+  warned_batch_ = false;
+  warned_outage_ = false;
+  warned_bridge_ = false;
+  warned_time_source_ = false;
   model_.stats().have_config.store(true, std::memory_order_relaxed);
   model_.set_signals(std::move(info));
 }
@@ -349,9 +356,8 @@ std::uint32_t Acquisition::build_stamps(const udps_frame_t* frame, int time_sign
       const double from = last_stream_anchor_;
       for (std::uint32_t k = 0; k < n; ++k) stamps_[k] = from + double(k + 1) * step;
       last_stream_anchor_ = stamps_[n - 1];
-      static bool bridged = false;
-      if (!bridged) {
-        bridged = true;
+      if (!warned_bridge_) {
+        warned_bridge_ = true;
         std::fprintf(stderr,
                      "[udpscope] warning: the stream's time signal %s (%g..%g against a "
                      "previous %g); bridging that packet at the declared cadence and "
@@ -360,9 +366,8 @@ std::uint32_t Acquisition::build_stamps(const udps_frame_t* frame, int time_sign
       }
     } else {
       used_stream_time = false;  // not a time base; fall back to arrival
-      static bool warned = false;
-      if (!warned) {
-        warned = true;
+      if (!warned_time_source_) {
+        warned_time_source_ = true;
         std::fprintf(stderr,
                      "[udpscope] warning: the stream's time signal %s (%g..%g); timing "
                      "samples by arrival instead. Check the time signal's mode and index "

src/acquisition.hpp

@@ -127,6 +127,11 @@ class Acquisition {
   /// Warn-once latch for a loss past the reservation cap. A member, not a function-local
   /// `static`, matching the latch Task 2 added for the same reason.
   bool warned_outage_ = false;
+  /// Warn-once latch for the one bridged packet whose time signal glitched.
+  bool warned_bridge_ = false;
+  /// Warn-once latch for the declared time signal failing for good, so the arrival clock is
+  /// taken instead.
+  bool warned_time_source_ = false;
   /// The re-plan generation this object last reacted to. The buffer is re-planned whenever the
   /// model rebuilds it, and the state tied to the old store (`tick_` and the accumulators) is
   /// reset when this falls behind `ScopeModel::plan_generation()`.