Technician tool v0.7

Imported from the Google Drive folder 004-technician_tool/v0.7.

tests/test_engine.py

@@ -43,16 +43,20 @@ APP = ["I (1299) app_init: Project name:     kota-sensorboard",
 # ------------------------------------------------------------------ rules
 
 def test_rules_load_and_have_no_cycles():
-    rules = load_rules()
-    by_id = {r.id: r for r in rules}
-    for r in rules:
-        seen, todo = set(), list(r.explained_by)
+    from kota_tech.diag import kota
+    graph = {r.id: r.explained_by for r in load_rules()}
+    for st in ("ERROR", "OUT_OF_RESOURCES", "CONNECTION_ERROR", "RTC_ERROR", "SD_ERROR", "RESETING", "HTTP_SERVER"):
+        for code in range(7):
+            if sf := kota.status_finding(st, code):
+                graph[sf[0]] = sf[5]
+    for start, explained_by in graph.items():
+        seen, todo = set(), list(explained_by)
         while todo:
             rid = todo.pop()
-            assert rid != r.id, f"explained_by cycle through {r.id}"
+            assert rid != start, f"explained_by cycle through {start}"
             if rid not in seen:
                 seen.add(rid)
-                todo += by_id[rid].explained_by
+                todo += graph.get(rid, ())
 
 
 # --------------------------------------------------------- real captures
@@ -233,3 +237,13 @@ def test_session_log_format(tmp_path):
     for ln in lines:
         e.feed(ln)
     assert e.boot.tool_reset
+
+
+def test_live_brownout_loop_is_a_power_problem():
+    # Real capture (2026-09-28): "E BOD: Brownout detector was triggered" has no
+    # timestamp and the ROM reports RTC_SW_SYS_RST, not a brown-out reset.
+    r = replay("live_brownout_loop_A4CB8FC946F8_fw1.0.txt")
+    top = r.roots[0]
+    assert top.finding.rule_id == "reboot.brownout" and top.finding.count >= 5
+    assert "reboot.loop" in {c.rule_id for c in top.consequences}
+    assert r.verdict.startswith("Problem: Power supply")