bend port flip: 9091 → 8320 (BEND mnemonic)

Port mnemonic embedded verbatim across our source files:

  8 ~= B (implied infinity B flattened; bake a cake; baby & me)
  3 ~= E (backward)
  2 ~= N (pivoted 90 degrees)
  0 ~= D (flattened)

Files touched:
- examples/cuda-fanout/gpu-worker.lsp (*worker-port*)
- examples/cuda-fanout/bend.lsp (*bend-worker-port*)
- examples/cuda-fanout/mock-worker.py (PORT)
- examples/cuda-fanout/bench_tiers.py (asm tier fixed port)
- examples/cuda-fanout/smoke-bend.lsp + smoke-bend-asm.lsp
- examples/cuda-fanout/README.md
- www/bend.html (catalog + multi-host text)
- Makefile (PORT default + comment)

bend.html updates 3090-ai + ai (4090) fleet table to active 2-node
mesh on 8320 — qwen moves off ai, bend takes over.

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