Ship Fase B slices: hierarchy, derating bands, timing, PI, ESD/return.

ERROR stays only for RULE+MANDATORY. Hierarchy walks component→pin→net→block.
Derating is PASS/MARGIN/RISK from Vop/Vrated. Timing and PI skip without numbers.
ESD and HS return path are REVIEW, not RULE ERROR.

backend/periscopex/finding_engine.py

@@ -137,6 +137,24 @@ def _seed() -> None:
          requirement="Kelvin/sense pin should not share the load net.")
     _add("PE-STCH-001", "TYPICAL", "INFO", domain="pcb",
          requirement="GND stitch via in the bbox of a signal over a GND pour.")
+    _add("PE-HIER-001", "TYPICAL", "INFO", domain="pcb",
+         requirement="Every component pin should land on a named net.")
+    _add("PE-DRT-002", "RECOMMENDED", "RISK", domain="pcb",
+         requirement="Vop/Vrated utilization band (not an invented dielectric %).")
+    _add("PE-DRT-003", "TYPICAL", "INFO", domain="pcb",
+         requirement="Capacitors with Vop and Vrated at or below 80% utilization.")
+    _add("PE-TIM-001", "MANDATORY", "RULE", domain="pcb",
+         requirement="Reset RC delay vs datasheet t_reset when both numbers exist.")
+    _add("PE-TIM-002", "MANDATORY", "RULE", domain="pcb",
+         requirement="Strap divider voltage vs Vih/Vil when both numbers exist.")
+    _add("PE-PI-001", "RECOMMENDED", "RISK", domain="pcb",
+         requirement="IC supply net should have a local decoupling capacitor.")
+    _add("PE-PI-002", "RECOMMENDED", "REVIEW", domain="pcb",
+         requirement="Local vs bulk on a supply when capacitance values exist.")
+    _add("PE-ESD-001", "RECOMMENDED", "REVIEW", domain="pcb",
+         requirement="Connector/USB net ESD — REVIEW unless a mandatory FACT exists.")
+    _add("PE-RET-001", "TYPICAL", "REVIEW", domain="pcb",
+         requirement="High-speed net over a GND pour should have a nearby GND via.")
 
 
 _seed()
@@ -215,6 +233,11 @@ def complete_finding(f: Finding) -> Finding:
         if f.finding_class == "RULE":
             f.finding_class = "RISK"
 
+    # ERROR only for a measured MANDATORY RULE. REVIEW/RISK/INFO stay ≤ WARNING.
+    if f.status == "ERROR":
+        if f.finding_class != "RULE" or prov != "MANDATORY":
+            f.status = "WARNING"
+
     if f.finding_class == "RULE" and f.confidence is None:
         f.confidence = 0.9 if f.evidence_status == "SUFFICIENT" else 0.3
     elif f.finding_class == "REVIEW" and f.confidence is None: