feat: render ">100" for above-range ZC Freq instead of "—"

BW writes ">100 Hz" for ZC Freq when the zero-crossing algorithm sees a
peak too fast to count — the device's reporting ceiling is 100 Hz on
V10.72.  Our parser fell back to None via _parse_number (which requires
a leading digit), so the PDF rendered "—" where BW shows ">100".

Mirrors the OORANGE/saturated pattern already used for PPV and PSPL:
parser stores the threshold (100.0) on zc_freq_hz + sets a new
zc_freq_above_range flag.  Projection carries the flag through to the
sidecar; PDF renderer prepends ">" when set.

Affects both per-channel stats tables (waveform + histogram variants)
and the mic block's ZC Freq row.

Verified on the real T190LD5Q.LK0W fixture: Tran zc_freq_hz=100.0
above_range=True; Vert/Long (normal values) above_range=False; "N/A"
still produces zc_freq_hz=None which renders as "—" (unchanged).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

minimateplus/event_file_io.py

@@ -125,6 +125,10 @@ def _bw_report_to_dict(report: BwAsciiReport) -> dict:
         # is the channel range max (a lower bound), not an exact reading.
         if getattr(cs, "ppv_saturated", False):
             out["ppv_saturated"] = True
+        # ZC Freq above device reporting ceiling (BW ">100 Hz") — value
+        # in zc_freq_hz is the threshold, not an exact measurement.
+        if getattr(cs, "zc_freq_above_range", False):
+            out["zc_freq_above_range"] = True
         return out
 
     def _sc(ch_name: str) -> dict:
@@ -187,11 +191,12 @@ def _bw_report_to_dict(report: BwAsciiReport) -> dict:
             },
         },
         "mic": {
-            "weighting":        report.mic.weighting,
-            "pspl_dbl":         report.mic.pspl_dbl,
-            "pspl_saturated":   bool(getattr(report.mic, "pspl_saturated", False)),
-            "zc_freq_hz":       report.mic.zc_freq_hz,
-            "time_of_peak_s":   report.mic.time_of_peak_s,
+            "weighting":             report.mic.weighting,
+            "pspl_dbl":              report.mic.pspl_dbl,
+            "pspl_saturated":        bool(getattr(report.mic, "pspl_saturated", False)),
+            "zc_freq_hz":            report.mic.zc_freq_hz,
+            "zc_freq_above_range":   bool(getattr(report.mic, "zc_freq_above_range", False)),
+            "time_of_peak_s":        report.mic.time_of_peak_s,
         },
         "sensor_check": {
             "tran": _sc("Tran"),