docs(ana-ml2): correct GPU spec Ada -> RTX PRO 6000 Blackwell (96GB, cc 12.0)

ana-ml2 was upgraded 2026-06 from dual RTX 6000 Ada (46GB, cc 8.9) to
dual RTX PRO 6000 Blackwell Max-Q (96GB, cc 12.0 / sm_120). Update the
stale hardware facts across the workspace:

- CLAUDE.md servers table row
- servers/ana-ml2/README.md hardware spec (+ refreshed system-details.txt)
- stacks/vllm compose + .env.example FP8/KV comments (Ada cc 8.9 -> Blackwell cc 12.0)
- stacks/llama-swap config VRAM-budget comment (48GB -> 96GB, GPU-0 pin)

Also corrects the adjacent stale 'Phi-4-mini' comment in the granite
service block (the service has been Granite 4.1 8B since 34a43a0).
Doc/comment-only; no runtime change.

servers/ana-ml2/README.md

@@ -15,7 +15,7 @@ Primary AI inference host for PFI.
   NOT Dell / not the same box as sf-r630 / sfsrv-ana)
 - **CPU:** AMD EPYC 9254 24-core (96 threads)
 - **RAM:** 566 GB
-- **GPUs:** 2x NVIDIA RTX 6000 Ada Generation (46 GB VRAM each, GPU 0 and GPU 1)
+- **GPUs:** 2x NVIDIA RTX PRO 6000 Blackwell Max-Q Workstation Edition (96 GB VRAM each, cc 12.0 / sm_120, GPU 0 and GPU 1) — upgraded 2026-06 from 2x RTX 6000 Ada (46 GB, cc 8.9). Blackwell adds native FP4 (NVFP4) tensor cores and doubles VRAM.
 - **Storage:** ZFS `zroot` (434 GB root) + `tank` pool (8.6 TB at `/tank`)
 - **OS:** Debian 13 (trixie), kernel 6.12.x
 - **Docker:** 29.3.1, runtimes: runc (default), nvidia, io.containerd.runc.v2