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/diagrams/pe_view.svg

@@ -26,6 +26,8 @@
   <text x="285.0" y="184.0" text-anchor="middle" font-family="monospace" font-size="10" fill="#ffffff">PE GEMM</text>
   <rect x="241.2" y="243.0" width="87.5" height="49.0" rx="4" fill="#ec4899" stroke="#475569" stroke-width="1"/>
   <text x="285.0" y="271.5" text-anchor="middle" font-family="monospace" font-size="10" fill="#ffffff">PE MATH</text>
+  <rect x="136.2" y="68.0" width="87.5" height="49.0" rx="4" fill="#e2e8f0" stroke="#475569" stroke-width="1"/>
+  <text x="180.0" y="96.5" text-anchor="middle" font-family="monospace" font-size="10" fill="#1e293b">PE MMU</text>
   <rect x="346.2" y="155.5" width="87.5" height="49.0" rx="4" fill="#10b981" stroke="#475569" stroke-width="1"/>
   <text x="390.0" y="184.0" text-anchor="middle" font-family="monospace" font-size="10" fill="#ffffff">PE TCM</text>
 </svg>