Wire PE_MMU to router mesh for MmuMapMsg delivery

Add router → PE_MMU edge so MmuMapMsg can reach PE_MMU via
the router mesh. Unskip all PE_MMU fabric tests.

339 passed, 0 skipped

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/kernbench/topology/builder.py

@@ -550,6 +550,14 @@ def _instantiate_cube(
                         distance_mm=clinks.get("noc_to_pe_cpu_mm", 0.0),
                         kind="pe_response",
                     ))
+                # PE_MMU ↔ router (mapping install path)
+                mmu_id = f"{cp}.{pe_prefix}.pe_mmu"
+                if mmu_id in nodes:
+                    edges.append(Edge(
+                        src=rid, dst=mmu_id,
+                        distance_mm=0.0,
+                        kind="command",
+                    ))
             elif item.endswith(".hbm"):
                 pass  # HBM edges handled below (all routers)
             elif item == "m_cpu":

tests/test_mmu_fabric.py

@@ -13,8 +13,6 @@ Validates:
 import pytest
 from pathlib import Path
 
-pytestmark = pytest.mark.skip(reason="PE_MMU routing via router mesh not yet wired (ADR-0019)")
-
 from kernbench.policy.address.allocator import AddressConfig, PEMemAllocator
 from kernbench.policy.address.pe_mmu import PeMMU
 from kernbench.policy.address.va_allocator import VirtualAllocator

tests/test_tensor_free.py

@@ -76,7 +76,6 @@ def test_allocator_free_tcm_reclaims_space():
 # ── TF2. del tensor triggers cleanup ─────────────────────────────────
 
 
-@pytest.mark.skip(reason="PE_MMU routing via router mesh not yet wired")
 def test_del_tensor_unmaps_mmu():
     """del tensor removes MMU mappings."""
     ctx, engine = _make_ctx()

tests/test_topology_compile.py

@@ -28,7 +28,7 @@ def test_full_graph_node_count():
 
 def test_full_graph_edge_count():
     g = _graph()
-    assert len(g.edges) == 10618
+    assert len(g.edges) == 10874
 
 
 # -- Full graph: specific nodes exist -----------------------------------------