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>

docs/adr/ADR-0015-component-port-wire-model.md

@@ -104,13 +104,13 @@ Kernel Launch routes through M_CPU for PE fan-out.
 ```text
 pcie_ep → io_noc → io_ucie
   → [transit cubes: ucie_in → noc → ucie_out]  (zero or more)
-  → target cube: ucie_in → noc → xbar → hbm_ctrl
+  → target cube: ucie_in → router mesh → hbm_ctrl
 ```
 
 **Memory R/W completion path:**
 
 ```text
-hbm_ctrl → xbar → noc → [transit cubes: ucie → noc → ucie]
+hbm_ctrl → router mesh → [transit cubes: ucie → router mesh → ucie]
   → io_ucie → io_noc → pcie_ep
 ```