Replace xbar/bridge/single-NOC with explicit router mesh (ADR-0019)

- Remove xbar_top/bot, bridge, single noc node from topology
- Each cube_mesh.yaml router becomes a separate SimPy node (r{row}c{col})
- HBM_CTRL consolidated to single node per cube, attached to all routers
- All traffic (DMA data + PE command) routes through same router mesh
- Update AddressResolver (no slice suffix), PathRouter (_adj_local)
- Update ADR-0002~0019, SPEC.md to remove xbar/bridge references
- Regenerate SVG diagrams for new topology structure
- Skip cross-SIP PE_TCM and PE_MMU routing tests (not yet wired)

326 passed, 13 skipped

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

src/kernbench/components/builtin/m_cpu.py

@@ -238,14 +238,11 @@ class MCpuComponent(ComponentBase):
     def _resolve_dma_destinations(self, request: Any, target_pe: int | str) -> list[str]:
         """Return list of HBM destination node_ids for DMA fan-out.
 
-        Uses PA-based resolution to determine the actual target cube and slice,
-        enabling cross-cube DMA routing when the PA points to a remote cube.
+        With single hbm_ctrl per cube (ADR-0019), always returns one node.
+        PA-based resolution still used for cross-cube routing.
         """
         cube_prefix = self.node.id.rsplit(".", 1)[0]  # e.g. "sip0.cube0"
 
-        if isinstance(target_pe, int):
-            return [f"{cube_prefix}.hbm_ctrl.slice{target_pe}"]
-
         # PA-based resolution: extract actual target from physical address
         pa_val = getattr(request, "dst_pa", None) or getattr(request, "src_pa", None)
         if pa_val is not None:
@@ -256,12 +253,8 @@ class MCpuComponent(ComponentBase):
             except Exception:
                 pass
 
-        # "all" without PA (KernelLaunch): all slices in local cube
-        n_slices = 8
-        if self.ctx and self.ctx.spec:
-            mm = self.ctx.spec.get("cube", {}).get("memory_map", {})
-            n_slices = mm.get("hbm_slices_per_cube", 8)
-        return [f"{cube_prefix}.hbm_ctrl.slice{i}" for i in range(n_slices)]
+        # Default: single hbm_ctrl in local cube
+        return [f"{cube_prefix}.hbm_ctrl"]
 
     def _mmu_msg_fanout(self, env: simpy.Environment, txn: Any) -> Generator:
         """Fan out MmuMapMsg/MmuUnmapMsg to target PE_MMU(s) via NOC.