Fix scheduler benchmark: use fake time with guard disabled at compile time

interval=0 causes infinite loop (reschedules at same time, never breaks).
interval=1 with millis() doesn't work (real time doesn't advance fast
enough between inner iterations for intervals to re-fire).

Solution: use interval=1 with monotonically increasing fake time (now++)
and disable WarnIfComponentBlockingGuard at compile time via
-DWARN_IF_BLOCKING_OVER_MS=UINT32_MAX in benchmark build flags. This
prevents the guard's (millis() - started_) underflow when fake time
exceeds real millis().

script/cpp_benchmark.py

@@ -34,6 +34,10 @@ PLATFORMIO_OPTIONS = {
         "-O2",  # optimize for speed (CodSpeed recommends RelWithDebInfo)
         "-g",  # debug symbols for profiling
         USE_TIME_TIMEZONE_FLAG,
+        # Disable WarnIfComponentBlockingGuard check — scheduler benchmarks
+        # use fake monotonic time ahead of real millis(), causing uint32_t
+        # underflow in the guard's (millis() - started_) calculation.
+        "-DWARN_IF_BLOCKING_OVER_MS=UINT32_MAX",
     ],
     # Use deep+ LDF mode to ensure PlatformIO detects the benchmark
     # library dependency from nested includes.