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-0006-topology-compilation-distance-diagram.md

@@ -61,9 +61,9 @@ For each view (SIP / CUBE / PE):
   - preserve connectivity semantics relevant to that view,
   - compute distance buckets and assign layout layers deterministically.
 - CUBE-level projection MUST include:
-  - XBAR (top/bottom), bridge (left/right), NOC, HBM_CTRL, shared SRAM, M_CPU, UCIe ports,
+  - Router mesh (from cube_mesh.yaml), HBM_CTRL, shared SRAM, M_CPU, UCIe ports,
     and PEs as opaque blocks.
-  - Distinct edge kinds for HBM path (PE→XBAR) vs non-HBM path (PE→NOC).
+  - All paths (HBM, non-HBM, command) route through the same router mesh (ADR-0019).
 - Default anchors are implicit (ADR-0005) and MUST NOT require instance indices.
 
 ### D6. Output formats and determinism