ADR-0001 Rev 2: 51-bit PhysAddr layout with concrete sub-unit tables

Remove rack_id (4 bits), rename sip_seg→die_id, shift fields to enable
42-bit local_offset (4 TB per die). Define PE_LOCAL/MCPU_LOCAL/CUBE_SRAM
sub-unit tables for AHBM dies and IOCPU sub-unit table for IOCHIPLET
dies (1 TB window). Supersedes ADR-0031.

Also fixes latent VA/PA confusion in pe_dma pipeline DMA path where
virtual addresses were decoded as physical addresses without MMU
translation — previously masked by coincidental bit-position alignment.

529 passed (+6 recovered), 10 pre-existing failures unchanged.

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

tests/test_adr0026_dppolicy_intra_device.py

@@ -149,7 +149,7 @@ def _make_tuple_allocators(
 ) -> dict[tuple[int, int, int], PEMemAllocator]:
     return {
         (s, c, p): PEMemAllocator(
-            rack_id=0, sip_id=s, cube_id=c, pe_id=p, cfg=_CFG,
+            sip_id=s, die_id=c, pe_id=p, cfg=_CFG,
         )
         for s in range(num_sips)
         for c in range(num_cubes)