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-0016-iochiplet-noc-and-memory-path.md

@@ -49,7 +49,7 @@ Memory operations (MemoryWrite, MemoryRead) are routed directly from pcie_ep
 through io_noc to the target cube, bypassing io_cpu entirely:
 
 ```text
-pcie_ep → io_noc → conn → io_ucie → [cube UCIe] → noc → xbar → hbm_ctrl
+pcie_ep → io_noc → conn → io_ucie → [cube UCIe] → router mesh → hbm_ctrl
 ```
 
 This avoids the 10ns io_cpu overhead for pure data transfers. The simulation