docs + script defaults: Q6_K swap, q8_0/f16 KV, split 0.68, FA rebuild

- spec matrix + PP doc + deployment.md + AGENTS.md + index.md: current
  production = Uncensored Q6_K + standalone MTP draft, mismatched
  q8_0/f16 KV with FA retained (GGML_CUDA_FA_ALL_QUANTS rebuild at
  9b05354ec), split 0.68 (45 blocks), KV 8624/3920, 273 MiB free.
- PP doc: 'FA-all-quants rebuild' section (flag, cmake commands, both
  hosts) + new-model split-limits measurements; old Q8_K_XL limits
  marked superseded.
- serve-pp-head.sh defaults: MODEL_FILE -> Q6_K, CACHE_TYPE_V -> f16
  (env already correct; defaults now match production).

AGENTS.md

@@ -3,12 +3,14 @@
 ## Overview
 
 This project manages deployment scripts for the LLM inference fleet.
-Dankclaw runs a llama.cpp pipeline-parallel head for Qwen3.8-27B (unsloth
-UD-Q8_K_XL): MTP draft (bundled head, `--spec-draft-n-max 4`) over the
-`--spec-default` ngram-mod fallback, 1 slot at 262144 context (pool
-262144), tensors split 0.53/0.47 (34 of 65 blocks) to the Dankserver RTX
-3090 `ggml-rpc` worker, head GPU side on ROCm0 (no `--device` flag), port
-7770.
+Dankclaw runs a llama.cpp pipeline-parallel head serving
+Qwen3.8-27B-Uncensored Q6_K (imatrix): MTP draft (standalone
+`-draft-Q8_0` sidecar, `--spec-draft-n-max 4`) over the `--spec-default`
+ngram-mod fallback, 1 slot at 262144 context (pool 262144), tensors
+split 0.68/0.32 (45 of 65 blocks) to the Dankserver RTX 3090 `ggml-rpc`
+worker, KV q8_0/f16 (mismatched, FA retained via the
+GGML_CUDA_FA_ALL_QUANTS rebuild), head GPU side on ROCm0 (no `--device`
+flag), port 7770.
 The Dankclaw NPU endpoint (FastFlowLM, `frank-default-small`, port 52625)
 serves Qwythos-9B-Claude-Mythos-5-1M (abliterated) as registry tag
 `qwythos:9b` at 262144 ctx (swapped in 2026-08-17; previously