Tools: PID debug toolchain from V0.1.x bring-up

test_run.py: judged closed-loop test over COM5 (fixed sequence, J1~J4

seg_rate.py

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+# -*- coding: utf-8 -*-
+"""Segment climb-rate analysis from test_events.log (2C buckets)."""
+import re
+
+rows = []
+for ln in open("test_events.log", encoding="utf-8", errors="replace"):
+    m = re.match(r"^([\d.]+) . ([\d.]+)  \[B5", ln)
+    if m:
+        rows.append((float(m.group(1)), float(m.group(2))))
+
+if not rows:
+    print("no frames")
+    raise SystemExit
+
+t0 = rows[0][0]
+print(f"{len(rows)} frames, span {rows[-1][0]-t0:.0f}s")
+
+segs = {}
+for t, v in rows:
+    segs.setdefault(int(v // 2) * 2, []).append((t, v))
+for k in sorted(segs):
+    seg = segs[k]
+    dt = seg[-1][0] - seg[0][0]
+    dv = seg[-1][1] - seg[0][1]
+    rate = dv / dt if dt > 0 else 0
+    print(f"  [{k:3d}-{k+2:3d}C] {dt:6.1f}s  rate={rate:+.3f} C/s  ({seg[0][1]:.1f}->{seg[-1][1]:.1f})")