docs(runbook): staged Swift15 w4dn8 runbook skeleton + index link

Contract facts frozen (payload chain, recipe tiers, shape, gates);
MEASURED@cutover slots for bench/KLD numbers.

serverAppConfigs-docs/LLM/index.md

@@ -137,6 +137,10 @@ frank-secondary, port 7771]
   target; payload on disk; owns the measured boot-pair table)**: the same
   runtime and the same 2 x 200,704 + f16 KV shape one quant rung lower —
   104.8 tok/s, 3,571 MiB true free
+- [[frank-primary-radiance-swift15-w4dn8]] — **STAGED (campaign running)**:
+  Swift1.5 Qwen3.8-Flash-Next BF16 → GPTQ-calibrated W4Dn8 `.rad` on radiance
+  1.0.13 (recipe + 10M-token calibration + KLD gate vs the BF16 container);
+  replaces the FP8-native payload when the gates pass
 - [[frank-primary-radiance-qwen38-native-fp8]] — **ACTIVE since 2026-10-05**
   (root systemd unit, port 7770): the StillDeadcode **radiance** engine
   (C++/HIP, libr4d gfx1201 kernels, digest-pinned 287 MiB image, engine as