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/services/pcb_pipeline.py

@@ -137,9 +137,16 @@ async def run_pcb_pipeline(
             fg_path = ws.local_path("functional_groups.json")
             fg_path.write_text(plan.model_dump_json(indent=2) + "\n")
             ws._upload_file("functional_groups.json")
+            from backend.periscopex.hierarchy import build_hierarchy
+
+            hier = build_hierarchy(graph, plan)
+            hier_path = ws.local_path("hierarchy.json")
+            hier_path.write_text(hier.model_dump_json(indent=2) + "\n")
+            ws._upload_file("hierarchy.json")
             _step(
                 project_id, "classify", "complete",
-                f"{len(plan.domains)} domains, {len(plan.groups)} groups",
+                f"{len(plan.domains)} domains, {len(plan.groups)} groups, "
+                f"{len(hier.blocks)} blocks",
             )
 
             if _cancelled(storage, user_id, project_id):
@@ -180,7 +187,7 @@ async def run_pcb_pipeline(
                 return
 
             _step(project_id, "checks", "running")
-            findings = run_pcb_checks(graph, cmap, layout)
+            findings = run_pcb_checks(graph, cmap, layout, plan)
             _step(
                 project_id, "checks", "complete",
                 f"{len(findings)} deterministic findings",